Multi-element anti-oxidation coating for high-temperature annealing of stainless steel welding material and process method

Abstract

The invention provides a multi-element anti-oxidation coating for high-temperature annealing of a stainless steel welding material and a process method, and belongs to the technical field of stainless steel welding materials. The multi-element anti-oxidation coating for high-temperature annealing of the stainless steel welding material comprises a solute and a solvent, the solute is prepared from the following components in percentage by mass: 62 to 69 percent of SiO2, 8 to 14 percent of Fe3O4 and 17 to 30 percent of Y2O3; the solvent is water. The process method comprises the following steps: proportioning and weighing a solute, weighing and heating a solvent, preparing a coating, using the coating, preparing a coating, annealing and homogenizing the coating, and detecting the performance. According to the multi-element anti-oxidation coating and the process method, corrosion and oxidation of high-temperature furnace gas on the surface of a stainless steel welding material can be effectively avoided, subcutaneous oxidation cracks and element depletion are reduced, the surface grinding amount of an annealed wire rod and the loss of a drawing die can be remarkably reduced, and meanwhile the surface quality of a welding wire is improved.

Description

Technical Field

[0001] This invention relates to the technical field of stainless steel welding materials, and in particular to a multi-element antioxidant coating and process method for high-temperature annealing of stainless steel welding materials. Background Technology

[0002] In the field of stainless steel welding consumables, the high-temperature stability and oxidation resistance of the materials are key technical challenges. Before cold drawing, welding wire rods must undergo high-temperature annealing to reduce deformation resistance and ensure pull-out plasticity. The annealing process causes internal and external oxidation of the material, leading to a decrease in material processing performance. During pull-out, subcutaneous cracks can cause pull-out cracking, hindering the smooth progress of pull-out and affecting the quality and reliability of the final product. To solve this problem, it is crucial to develop coatings or coating technologies that can effectively prevent oxidation of stainless steel welding consumables during high-temperature annealing.

[0003] Conventional high-temperature protective coatings, such as first-generation thermal diffusion coatings and second-generation M (M=Fe, Ni, or Co)CrAlY coatings, while providing some degree of oxidation protection, are gradually becoming insufficient to meet the demands of higher operating temperatures and oxidation resistance requirements for stainless steel, which necessitates higher processing temperatures due to increasing demands for engine efficiency and energy conservation. While new-generation thermal barrier coatings effectively improve temperature resistance, their interdiffusion between the coating and substrate, as well as the stability of the anti-oxidation film, remain inadequate. Furthermore, their high cost generally limits their use to finished hot-end components, making their application in material processing less cost-effective.

[0004] For example, Chinese patent CN101037552A discloses a high-temperature alloy coating for hot components of a gas turbine. This coating is an alloy coating whose main components are cobalt, nickel, chromium, aluminum, and yttrium. The main alloying elements are expensive and contain a lot of impurities. In addition, the coating is used as a transition layer to prevent the thermal insulation ceramic material coating of the hot component from peeling off. Obviously, the hot component does not need to be cold-drawn or forged. The coating cracks and peeling off after cold drawing or forging are not considered, which would lead to a decrease in high-temperature oxidation resistance.

[0005] Chinese patent CN117645805A discloses a high-temperature anti-oxidation gradient coating on the surface of a tantalum-tungsten alloy and its preparation method. The substrate is a tantalum-tungsten alloy, and the material composition used in the coating includes ZrB2, HfB2, 8YSZ, SiC, SiO2, La2Zr2O7, Si, etc. Obviously, the substrate is not stainless steel welding material, so the selection mechanism of the coating composition cannot provide technical inspiration for the selection of coating composition for stainless steel welding material. Furthermore, the preparation and use of the coating requires high-temperature sintering and heat preservation. The coating structure is a gradient decrease of ZrB2 content from the inside to the outside, which is complex, and the preparation process is long and inefficient.

[0006] Chinese patent CN113045912A discloses a high-temperature anti-oxidation coating for heat treatment of stainless steel workpieces and its preparation method. Obviously, the amount of solvent water added to the coating powder is not much, and wet ball milling is required to obtain the coating. The coating contains a lot of impurities, so the coating formed will crack during cold drawing or forging.

[0007] It is evident that research on anti-oxidation coatings for high-temperature and complex environments is quite extensive, and the compositional requirements of anti-oxidation coatings vary across different application scenarios. This solution specifically addresses the high-temperature annealing treatment of stainless steel welding materials, proposing an anti-oxidation coating designed to inhibit both internal and external oxidation. Its unique composition effectively mitigates high-temperature oxidation. Summary of the Invention

[0008] The main objective of this invention is to address the technical problems in existing technologies regarding the selection of antioxidant coating components and preparation methods for high-temperature and complex environments, such as weak antioxidant capacity, easy peeling, and uneven protection. Therefore, this invention proposes a multi-component antioxidant coating and its processing method for high-temperature annealing of stainless steel welding materials, which can solve the aforementioned problems.

[0009] A multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; the solute includes, by mass percentage: SiO2 62-69%, Fe3O4 8-14%, Y2O3 17-30%; the solvent is water.

[0010] Optionally, the volume ratio of the solute to the solvent is 1:1.15 to 1:2.30.

[0011] Optionally, the water is deionized water or distilled water, and the temperature is 40-50℃.

[0012] Optionally, the loss rate of the stainless steel welding material after high-temperature annealing and protection with multi-element anti-oxidation coating is 1.5-2.5% when the welding wire rod is ground to a bright finish, the cold-drawn surface is free of cracks, and the coating surface quality is intact.

[0013] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0014] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0015] S2. Solvent weighing and heating: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a certain temperature to obtain the heated solvent.

[0016] S3. Coating preparation: Dissolve the weighed solute mixture from S1 in the heated solvent from S2, stir and mix well to obtain the coating product.

[0017] S4. Application of coating and preparation of coating: Apply the coating product of S3 to the surface of the stainless steel welding material to be treated, heat and bake the coated stainless steel welding material to be treated to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with coating.

[0018] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material is subjected to annealing homogenization treatment to obtain annealed coated stainless steel welding material; the coating performance of the stainless steel welding material is tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, forging edge cracks, and coating surface quality.

[0019] Optionally, in the formulation of raw materials S1, the solute includes: SiO2 64-66%, Fe3O4 10-12%, Y2O3 19-25%.

[0020] Optionally, the heating and heat preservation temperature of S2 is 40-46℃, and the heat preservation time is 60-120min.

[0021] Optionally, the stirring speed of S3 is 60-100 r / min, and the stirring time is 5-10 min.

[0022] Optionally, S4 is applied by hand using a brush, with a coating thickness of 50-200μm on the surface of the stainless steel welding material to be treated. The heating and baking rate is 3-5℃ / min, the baking temperature is 250-300℃, and the baking time is 60-80min.

[0023] Optionally, the heating rate for the annealing homogenization treatment of S5 is 3-5℃ / min, the annealing temperature is 900-1050℃, and the homogenization time is 2-5h.

[0024] Optionally, the S5 high-temperature resistant and oxidation-resistant coated stainless steel welding material has a coating thickness of 50-200μm, a coating density of 80-90%, a coating surface roughness of 1.0-3.2μm, a metallurgical bond strength between the coating and the stainless steel welding material of 20-50MPa, a coating hardness of 45-50HRC, and the coating can withstand high temperatures of 1000-1200℃ for 30-50h.

[0025] Technical principle of the invention:

[0026] The main materials of the coating powder in this invention are SiO2, Fe3O4, and Y2O3. SiO2 can combine with other components to improve the coating's antioxidant effect and mechanical strength. Both oxides have high melting points and good thermal stability, maintaining structural stability in high-temperature environments and resisting decomposition or melting, thus enhancing the coating's protective performance at high temperatures. In this invention, the two substances begin to soften and melt at high temperatures, forming a low-melting-point glassy film that adheres uniformly and firmly to the surface of the welding wire rod.

[0027] The addition of Fe3O4 aims to melt and form an inert protective film at high temperatures, thus providing an additional antioxidant barrier. This protective film reduces the penetration of oxygen and other corrosive gases, isolating and slowing down the oxidation of the underlying material. When Fe3O4 works in combination with Y2O3, Fe3O4 further enhances the overall antioxidant capacity of the coating. Specifically, Fe3O4 can transform into a dense oxide film under high temperatures, tightly bonding with the surface of the underlying material, improving the durability and corrosion resistance of the coating in harsh high-temperature environments. Simultaneously, this protective film exhibits good stability under temperature fluctuations, synergistically providing comprehensive thermal protection with Y2O3, while Fe3O4 adds multiple layers of protection to the coating.

[0028] Yttrium oxide (Y₂O₃) is widely used in thermal barrier coatings due to its outstanding corrosion resistance and mechanical strength, as well as its significant antioxidant capacity at high temperatures. The use of this coating significantly increases the upper limit of the processing temperature while maintaining excellent thermal shock resistance. Specifically, the addition of Y₂O₃ primarily serves to stabilize the coating structure.

[0029] In the method of this invention, if the baking temperature is too high or the baking time is too long, the oxide coating will become over-dried, which will cause cracks and affect the protective effect of the coating. On the other hand, it will not be able to effectively adhere to the surface of the stainless steel welding wire rod and will fall off due to high temperature during the annealing process, further weakening the protective effect of the coating. If the baking temperature is too low or the baking time is too short, the coating cannot be effectively cured. During the transfer of the welding wire rod, the coating will flow or drip under the action of gravity, which is not conducive to production and processing, and will also lead to uneven coating thickness. During the annealing process, the protective effect of the welding wire rod is uneven at different positions.

[0030] In summary, the multi-element antioxidant coating and process method of this invention can effectively prevent the corrosion and oxidation of stainless steel welding materials by high-temperature furnace gas, reduce subcutaneous oxidation cracks and element depletion, significantly reduce the surface grinding amount of wire rod after annealing and the wear of drawing dies, and improve the surface quality of welding wire.

[0031] The above technical solution has at least the following advantages compared with the existing technology:

[0032] The above-mentioned solution proposes a multi-element antioxidant coating and process for high-temperature annealing of stainless steel welding materials, which can solve the technical problems of weak antioxidant capacity, easy peeling and uneven protection in the selection of antioxidant coating components and preparation methods in high-temperature complex environments in the prior art.

[0033] This invention achieves superior oxidation resistance in coated stainless steel welding wire rods by precisely controlling the proportions of each component in the mixed coating and employing application techniques specifically designed for this coating, thus demonstrating its significant technical advantages. This solution not only enhances the protective effect of the coating but also ensures its stability and durability under high-temperature environments, providing a more reliable protective solution for the application of stainless steel welding wire.

[0034] The main materials selected in the mixed coating of this invention are SiO2, Fe3O4, and Y2O3. Among them, SiO2 can improve the anti-oxidation effect and mechanical strength of the coating; Fe3O4 melts at high temperature to form an inert protective film that reduces the penetration of oxygen and other corrosive gases, and isolates and slows down the oxidation of the underlying material; Y2O3 can synergistically enhance the overall anti-oxidation ability of the coating with Fe3O4 and make the high-temperature structure of the coating stable.

[0035] This invention, by baking the coating on the surface of stainless steel welding materials, enables the coating to adhere to the surface of the wire rod and obtain a certain bonding strength, thereby protecting the surface of the wire rod from high-temperature oxidation.

[0036] The present invention enables the coating to be cured on the surface of the wire rod and further improves the bonding strength through annealing homogenization treatment.

[0037] In summary, compared to existing methods for selecting and preparing antioxidant coatings for high-temperature and complex environments, the method of this invention, by using specific coatings and corresponding application methods, allows stainless steel welding wire rods to withstand longer annealing heat treatment times while maintaining surface quality. This effectively reduces the erosion and oxidation of the welding wire rod surface by high-temperature furnace gases, minimizing subcutaneous oxidation cracks and element depletion. On the one hand, it reduces the risk of cracking during cold drawing; on the other hand, it effectively reduces grinding work, saves time, and improves the overall yield, effectively saving production costs and improving the economic benefits for enterprises. Therefore, this method is simple in process, easy to operate, allows for convenient improvement of the device structure, is low in cost, and highly efficient, making it suitable for large-scale industrial production and widespread application. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is an electron microscope image showing the degree of oxidation of the cross section after annealing homogenization treatment in a multi-element anti-oxidation coating and process method for high-temperature annealing of stainless steel welding materials according to Embodiment 1 of the present invention.

[0040] Figure 2 This is an electron microscope image showing the degree of oxidation of the cross-section of a stainless steel wire rod without the coating of the present invention after annealing and homogenization treatment, which is a comparative example of the present invention (1). Detailed Implementation

[0041] The technical solution of the present invention will now be described with reference to the accompanying drawings.

[0042] In embodiments of the present invention, words such as "exemplarily," "for example," etc., are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" in the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present the concept in a concrete manner. Furthermore, in embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one.

[0043] In the embodiments of the present invention, the terms "image" and "picture" may sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, their intended meanings are consistent.

[0044] In this embodiment of the invention, sometimes a subscript such as W1 may be written in a non-subscript form such as W1. When the difference is not emphasized, the meaning they express is the same.

[0045] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0046] A multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; the solute includes, by mass percentage: SiO2 62-69%, Fe3O4 8-14%, Y2O3 17-30%; the solvent is water.

[0047] Specifically, the volume ratio of the solute to the solvent is 1:1.15 to 1:2.30.

[0048] Specifically, the water is deionized or distilled, and the temperature is 40-50℃.

[0049] Specifically, the loss rate of the stainless steel welding material after high-temperature annealing and protection with multi-element anti-oxidation coating is 1.5-2.5% when the welding wire rod is ground to a bright finish, the cold-drawn surface is free of cracks, and the coating surface quality is intact.

[0050] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0051] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0052] S2. Solvent weighing and heating: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a certain temperature to obtain the heated solvent.

[0053] S3. Coating preparation: Dissolve the weighed solute mixture from S1 in the heated solvent from S2, stir and mix well to obtain the coating product.

[0054] S4. Application of coating and preparation of coating: Apply the coating product of S3 to the surface of the stainless steel welding material to be treated, heat and bake the coated stainless steel welding material to be treated to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with coating.

[0055] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material is subjected to annealing homogenization treatment to obtain annealed coated stainless steel welding material; the coating performance of the stainless steel welding material is tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, forging edge cracks, and coating surface quality.

[0056] Specifically, in the formulation of raw materials for S1, the solutes include: SiO2 64-66%, Fe3O4 10-12%, and Y2O3 19-25%.

[0057] Specifically, the heating and heat preservation temperature of S2 is 40-46℃, and the heat preservation time is 60-120min.

[0058] Specifically, the stirring speed for S3 is 60-100 r / min, and the stirring time is 5-10 min.

[0059] Specifically, the S4 coating method involves manual brushing with a brush, with a coating thickness of 50-200 μm on the surface of the stainless steel welding material to be treated. The heating and baking process involves a heating rate of 3-5℃ / min, a baking temperature of 250-300℃, and a baking time of 60-80 min.

[0060] Specifically, the heating rate for the annealing homogenization treatment of S5 is 3-5℃ / min, the annealing temperature is 900-1050℃, and the homogenization time is 2-5h.

[0061] Specifically, the S5 high-temperature resistant and oxidation-resistant coated stainless steel welding material has a coating thickness of 50-200μm, a coating density of 80-90%, a coating surface roughness of 1.0-3.2μm, a metallurgical bond strength between the coating and the stainless steel welding material of 20-50MPa, a coating hardness of 45-50HRC, and the coating can withstand high temperatures of 1000-1200℃ for 30-50 hours.

[0062] Example 1

[0063] This embodiment provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, wherein the stainless steel welding material is Super304H stainless steel; the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; by mass percentage, the solute includes: SiO2 62%, Fe3O4 8%, Y2O3 30%; the solvent is distilled water at 40°C.

[0064] The volume ratio of the solute to the solvent is 1:1.15.

[0065] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0066] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0067] S2. Weighing and heating of solvent: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a temperature of 40℃ for 60 minutes to obtain the heated solvent.

[0068] S3. Coating preparation: Dissolve the weighed solute mixture from S1 in the heated solvent from S2, stir and mix thoroughly at a stirring speed of 60 r / min for 5 min to obtain the coating product.

[0069] S4. Application of coating and preparation of coating: The coating product of S3 is applied to the surface of the stainless steel welding material to be treated by manual brushing. The coating thickness on the surface of the stainless steel welding material to be treated is 50μm. The coated stainless steel welding material is heated and baked at a heating rate of 3℃ / min, a baking temperature of 250℃, and a baking time of 60min to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with a coating.

[0070] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material is subjected to annealing homogenization treatment. The heating rate is 3℃ / min, the annealing temperature is 900℃, and the homogenization time is 2h to obtain annealed coated stainless steel welding material. The coating performance of the stainless steel welding material is tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, and coating surface quality.

[0071] The annealed coated stainless steel welding material prepared in this embodiment has a coating thickness of 50 μm, a coating density of 81%, a coating surface roughness of 3.0, a metallurgical bond strength between the coating and the stainless steel welding material of 31 MPa, a coating hardness of 45, and the coating can withstand a high temperature of 1100°C for 38 hours.

[0072] The degree of oxidation of the cross-section after annealing and homogenization treatment is as follows: Figure 1 As shown.

[0073] In this embodiment, the loss rate of the annealed coated stainless steel welding material after grinding to a bright welding wire rod is 2.3%, the surface crack of the cold-drawn material is 0.10 mm, and the coating surface quality is intact.

[0074] Example 2

[0075] This embodiment provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, wherein the stainless steel welding material is 1Cr13 stainless steel; the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; by mass percentage, the solute includes: SiO2 69%, Fe3O4 14%, Y2O3 17%; the solvent is distilled water at 48°C.

[0076] The volume ratio of the solute to the solvent is 1:2.1.

[0077] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0078] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0079] S2. Weighing and heating of solvent: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a temperature of 45℃ for 85 minutes to obtain the heated solvent.

[0080] S3. Coating preparation: Dissolve the weighed solute mixture from S1 in the heated solvent from S2, stir and mix thoroughly at a stirring speed of 70 r / min for 8 min to obtain the coating product.

[0081] S4. Application of coating and preparation of coating: The coating product of S3 is applied to the surface of the stainless steel welding material to be treated by manual brushing. The coating thickness on the surface of the stainless steel welding material to be treated is 70μm. The stainless steel welding material to be treated with coating is heated and baked at a heating rate of 4℃ / min, a baking temperature of 265℃, and a baking time of 72min to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with coating.

[0082] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material was subjected to annealing homogenization treatment. The heating rate was 3.5℃ / min, the annealing temperature was 935℃, and the homogenization time was 4.5h to obtain annealed coated stainless steel welding material. The coating performance of the stainless steel welding material was tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, forging edge cracks, and coating surface quality.

[0083] The annealed coated stainless steel welding material prepared in this embodiment has a coating thickness of 70 μm, a coating density of 87%, a coating surface roughness of 3.1, a metallurgical bond strength between the coating and the stainless steel welding material of 42 MPa, a coating hardness of 48, and the coating can withstand a high temperature of 1200℃ for 40 hours.

[0084] In this embodiment, the loss rate of the annealed coated stainless steel welding material after grinding to a bright welding wire rod is 2.4%, the surface crack of the cold-drawn material is 0.08 mm, and the coating surface quality is intact.

[0085] Example 3

[0086] This embodiment provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, wherein the stainless steel welding material is Cr14Ni2 stainless steel; the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; by mass percentage, the solute includes: SiO2 64%, Fe3O4 10%, Y2O3 26%; the solvent is distilled water at 43°C.

[0087] The volume ratio of the solute to the solvent is 1:2.3.

[0088] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0089] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0090] S2. Weighing and heating of solvent: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a temperature of 42℃ for 110 minutes to obtain the heated solvent.

[0091] S3. Coating preparation: Dissolve the weighed solute mixture from S1 in the heated solvent from S2, stir and mix thoroughly at a stirring speed of 90 r / min for 9 min to obtain the coating product.

[0092] S4. Application of coating and preparation of coating: The coating product of S3 is applied to the surface of the stainless steel welding material to be treated by manual brushing. The coating thickness on the surface of the stainless steel welding material to be treated is 100μm. The coated stainless steel welding material to be treated is heated and baked at a heating rate of 4.8 / min, a baking temperature of 295℃, and a baking time of 80min to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with a coating.

[0093] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material was subjected to annealing homogenization treatment. The heating rate was 5℃ / min, the annealing temperature was 1050℃, and the homogenization time was 4.5h to obtain annealed coated stainless steel welding material. The coating performance of the stainless steel welding material was tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, forging edge cracks, and coating surface quality.

[0094] The annealed coated stainless steel welding material prepared in this embodiment has a coating thickness of 100 μm, a coating density of 88%, a coating surface roughness of 2.2, a metallurgical bond strength between the coating and the stainless steel welding material of 35 MPa, a coating hardness of 45, and the coating can withstand a high temperature of 1000℃ for 30 hours.

[0095] In this embodiment, the loss rate of the annealed coated stainless steel welding material after grinding to a bright welding wire rod is 1.5%, the surface crack of the cold-drawn material is 0.05mm, and the coating surface quality is intact.

[0096] Example 4

[0097] This embodiment provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, wherein the stainless steel welding material is 1Cr17Ni2 stainless steel; the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; by mass percentage, the solute includes: SiO2 66%, Fe3O4 12%, Y2O3 22%; the solvent is distilled water at 45°C.

[0098] The volume ratio of the solute to the solvent is 1:1.3.

[0099] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0100] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0101] S2. Weighing and heating of solvent: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a temperature of 45℃ for 100 minutes to obtain the heated solvent.

[0102] S3. Coating preparation: Dissolve the weighed solute mixture from S1 in the heated solvent from S2, stir and mix thoroughly at a stirring speed of 98 r / min for 9 min to obtain the coating product.

[0103] S4. Application of coating and preparation of coating: The coating product of S3 is applied to the surface of the stainless steel welding material to be treated by manual brushing. The thickness of the coating product on the surface of the stainless steel welding material to be treated is 100μm. The stainless steel welding material to be treated with the coating is heated and baked at a heating rate of 5℃ / min, a baking temperature of 300℃, and a baking time of 80min to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with a coating.

[0104] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material is subjected to annealing homogenization treatment. The heating rate is 5℃ / min, the annealing temperature is 1000℃, and the homogenization time is 5h to obtain annealed coated stainless steel welding material. The coating performance of the stainless steel welding material is tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, forging edge cracks, and coating surface quality.

[0105] The annealed coated stainless steel welding material prepared in this embodiment has a coating thickness of 100 μm, a coating density of 90%, a coating surface roughness of 3.2 μm, a metallurgical bond strength between the coating and the stainless steel welding material of 45 MPa, a coating hardness of 46 HRC, and the coating can withstand a high temperature of 1180℃ for 4 hours.

[0106] In this embodiment, the loss rate of the annealed coated stainless steel welding material after grinding to a bright welding wire rod is 1.8%, the surface crack of the cold-drawn material is 0.09 mm, and the coating surface quality is intact.

[0107] Example 5

[0108] This embodiment provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, wherein the stainless steel welding material is 2Cr13 stainless steel; the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; by mass percentage, the solute includes: SiO2 68%, Fe3O4 13%, Y2O3 19%; the solvent is distilled water at 42°C.

[0109] The volume ratio of the solute to the solvent is 1:2.2.

[0110] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0111] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0112] S2. Weighing and heating of solvent: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a temperature of 44.5℃ for 70 minutes to obtain the heated solvent.

[0113] S3. Coating preparation: Dissolve the weighed solute mixture of S1 in the heated solvent of S2, stir and mix well at a stirring speed of 75 r / min for 6 min to obtain the coating product.

[0114] S4. Application of coating and preparation of coating: The coating product of S3 is applied to the surface of the stainless steel welding material to be treated by manual brushing. The coating thickness on the surface of the stainless steel welding material to be treated is 70μm. The coated stainless steel welding material is heated and baked at a heating rate of 4.2 / min, a baking temperature of 265℃, and a baking time of 4.2min to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with coating.

[0115] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material was subjected to annealing homogenization treatment. The heating rate was 4.9℃ / min, the annealing temperature was 1022℃, and the homogenization time was 3.5h to obtain annealed coated stainless steel welding material. The coating performance of the stainless steel welding material was tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, forging edge cracks, and coating surface quality.

[0116] The annealed coated stainless steel welding material prepared in this embodiment has a coating thickness of 180 μm, a coating density of 90%, a coating surface roughness of 1.6 μm, a metallurgical bond strength between the coating and the stainless steel welding material of 40 MPa, a coating hardness of 46 HRC, and the coating can withstand a high temperature of 1150℃ for 48 hours.

[0117] In this embodiment, the loss rate of the annealed coated stainless steel welding material after grinding to a bright welding wire rod is 2.0%, the surface crack of the cold-drawn material is 0.012mm, and the coating surface quality is intact.

[0118] Comparative Examples 1-4 are based on Examples 1-5, but only the proportions of the components of the coating solute are changed, while the volume ratio of the coating solute to the solvent water remains unchanged, and the same process method is used.

[0119] Among them, Comparative Example 1 provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials. The multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent. By mass percentage, the solute includes: SiO2 70%, Fe3O4 7%, Y2O3 23%; the solvent is distilled water at 40°C.

[0120] The degree of oxidation of the cross-section without annealing and homogenization treatment is as follows: Figure 2 As shown.

[0121] The loss rate of the annealed coated stainless steel welding material in Comparative Example 1, which was ground to a bright finish, was 9%, the surface crack in the cold-drawn material was 1 mm, and the coating surface quality cracked.

[0122] Comparative Example 2 provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials. The multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent. By mass percentage, the solute includes: SiO2 58%, Fe3O4 8%, Y2O3 34%; the solvent is distilled water at 45°C.

[0123] In Comparative Example 2, the loss rate of annealed coated stainless steel welding materials after grinding to a bright welding wire rod was 10%, the surface crack in cold drawing was 1.2 mm, and the coating surface quality cracked.

[0124] Comparative Example 3 provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials. The multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent. By mass percentage, the solute includes: SiO2 80%, Fe3O4 10%, Y2O3 10%; the solvent is distilled water at 42°C.

[0125] The loss rate of the annealed coated stainless steel welding material in Comparative Example 3 after grinding to a bright welding wire rod was 12%, the surface crack in the cold-drawn material was 0.8 mm, and the coating surface quality was intact.

[0126] Comparative Example 4 shows a stainless steel welding material with no surface coating.

[0127] In Comparative Example 4, the loss rate of annealed coated stainless steel welding material after grinding to a bright welding wire rod was 15%, the surface crack in cold drawing was 0.7 mm, and there was no coating.

[0128] Combination Figure 1-2 By comparing Examples 1-5 and Comparative Examples 1-2, it can be seen that the coating of the present invention has a very good protective effect on the welding wire during the annealing process.

[0129] In Comparative Example 1, the three components, SiO2, Fe3O4, and Y2O3, were not within the scope defined by this invention. Compared with Comparative Examples 2 and 3, the degree of drawing cracking after heat treatment, the surface quality of the coating, and the wear of the welding wire rod during grinding all had certain negative effects.

[0130] In Comparative Example 2, reducing the content of Fe3O4 to 8%, SiO2 to 58%, and Y2O3 to 34% significantly negatively impacted the degree of surface cracking of the welding wire, the surface quality of the coating, and the wear during grinding.

[0131] Therefore, this invention achieves superior oxidation resistance in coated stainless steel welding wire rods by precisely controlling the proportions of each component in the mixed coating and employing application techniques specifically designed for this coating, thus demonstrating its significant technical advantages. This solution not only enhances the protective effect of the coating but also ensures its stability and durability under high-temperature environments, providing a more reliable protective solution for the application of stainless steel welding wire.

[0132] Example 6

[0133] This embodiment provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, wherein the stainless steel welding material is Super304H stainless steel; the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; by mass percentage, the solute includes: SiO2 65%, Fe3O4 10%, Y2O3 25%; the solvent is distilled water at 40°C.

[0134] The volume ratio of the solute to the solvent is 1:1.2.

[0135] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0136] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0137] S2. Weighing and heating of solvent: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a temperature of 40℃ for 60 minutes to obtain the heated solvent.

[0138] S3. Coating preparation: Dissolve the weighed solute mixture from S1 in the heated solvent from S2, stir and mix thoroughly at a stirring speed of 65 r / min for 8 min to obtain the coating product.

[0139] S4. Application of coating and preparation of coating: The coating product of S3 is applied to the surface of the stainless steel welding material to be treated by manual brushing. The thickness of the coating product on the surface of the stainless steel welding material to be treated is 100μm. The stainless steel welding material to be treated with the coating is heated and baked at a heating rate of 5℃ / min, a baking temperature of 280℃, and a baking time of 70min to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with a coating.

[0140] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material was subjected to a two-stage annealing homogenization treatment. The heating rate was 4.5℃ / min, the two-stage annealing temperatures were 1060℃ and 1100℃, and the homogenization time was 2h for both stages, resulting in annealed coated stainless steel welding material. The coating performance of the stainless steel welding material was tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, forging edge cracks, and coating surface quality.

[0141] The annealed coated stainless steel welding material prepared in this embodiment has a coating thickness of 100 μm, a coating density of 84%, a coating surface roughness of 1.8 μm, a metallurgical bond strength between the coating and the stainless steel welding material of 30 MPa, a coating hardness of 48 HRC, and the coating can withstand a high temperature of 1150℃ for 48 hours.

[0142] In this embodiment, the loss rate of the annealed coated stainless steel welding material after grinding to a bright welding wire rod is 2.0%, the forging edge crack is 0.08mm, and the coating surface quality is intact.

[0143] Example 7

[0144] This embodiment provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, wherein the stainless steel welding material is stainless steel Super304H; the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; by mass percentage, the solute includes: SiO2 68%, Fe3O4 12%, Y2O3 20%; the solvent is distilled water at 44°C.

[0145] The volume ratio of the solute to the solvent is 1:2.2.

[0146] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0147] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0148] S2. Weighing and heating of solvent: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a temperature of 42℃ for 70 minutes to obtain the heated solvent.

[0149] S3. Coating preparation: Dissolve the weighed solute mixture from S1 in the heated solvent from S2, stir and mix thoroughly at a stirring speed of 110 r / min for 6 min to obtain the coating product.

[0150] S4. Application of coating and preparation of coating: The coating product of S3 is applied to the surface of the stainless steel welding material to be treated by manual brushing. The coating thickness on the surface of the stainless steel welding material to be treated is 90μm. The coated stainless steel welding material is heated and baked at a heating rate of 4.7℃ / min, a baking temperature of 260℃, and a baking time of 75min to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with a coating.

[0151] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material was subjected to a two-stage annealing homogenization treatment. The heating rate was 4.6℃ / min, the two-stage annealing temperatures were 1060℃ and 1100℃, and the homogenization time was 2h for both stages, resulting in annealed coated stainless steel welding material. The coating performance of the stainless steel welding material was tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, forging edge cracks, and coating surface quality.

[0152] The annealed coated stainless steel welding material prepared in this embodiment has a coating thickness of 90 μm, a coating density of 88%, a coating surface roughness of 2.4 μm, a metallurgical bond strength between the coating and the stainless steel welding material of 40 MPa, a coating hardness of 42 HRC, and the coating can withstand a high temperature of 1160℃ for 42 hours.

[0153] In this embodiment, the loss rate of the annealed coated stainless steel welding material after grinding to a bright welding wire rod is 2.2%, the forging edge crack is 0.07mm, and the coating surface quality is intact.

[0154] Example 8

[0155] This embodiment provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, wherein the stainless steel welding material is stainless steel Super304H; the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; by mass percentage, the solute includes: SiO2 68%, Fe3O4 12%, Y2O3 20%; the solvent is distilled water at 44°C.

[0156] The volume ratio of the solute to the solvent is 1:2.0.

[0157] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0158] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0159] S2. Weighing and heating of solvent: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a temperature of 42℃ for 85 minutes to obtain the heated solvent.

[0160] S3. Coating preparation: Dissolve the weighed solute mixture of S1 in the heated solvent of S2, stir and mix well at a stirring speed of 115 r / min for 9 min to obtain the coating product.

[0161] S4. Application of coating and preparation of coating: The coating product of S3 is applied to the surface of the stainless steel welding material to be treated by manual brushing. The thickness of the coating product on the surface of the stainless steel welding material to be treated is 85μm. The stainless steel welding material to be treated with coating is heated and baked at a heating rate of 3.5 / min, a baking temperature of 260℃, and a baking time of 72min to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with coating.

[0162] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material was subjected to a two-stage annealing homogenization treatment. The heating rate was 4.5℃ / min, the two-stage annealing temperatures were 1060℃ and 1100℃, and the homogenization time was 2h for both stages, resulting in annealed coated stainless steel welding material. The coating performance of the stainless steel welding material was tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, forging edge cracks, and coating surface quality.

[0163] The annealed coated stainless steel welding material prepared in this embodiment has a coating thickness of 85 μm, a coating density of 80%, a coating surface roughness of 1.8 μm, a metallurgical bond strength between the coating and the stainless steel welding material of 35 MPa, a coating hardness of 46 HRC, and the coating can withstand a high temperature of 1180℃ for 30 hours.

[0164] In this embodiment, the loss rate of the annealed coated stainless steel welding material after grinding to a bright welding wire rod is 1.8%, the forging edge crack is 0.06mm, and the coating surface quality is intact.

[0165] Comparative Examples 5-6 are based on Examples 6-8, but only the proportions of each component of the coating solute and the volume ratio of solute to solvent are changed, without changing the process method.

[0166] Among them, Comparative Example 5 provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials. The multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent. By mass percentage, the solute includes: SiO2 70%, Fe3O4 16%, Y2O3 14%; the solvent is distilled water at 40°C.

[0167] The loss rate of the annealed coated stainless steel welding material in Comparative Example 5 after grinding to a bright welding wire rod was 8%, the forging edge crack was 1.2 mm, and the coating surface quality cracked.

[0168] Comparative Example 6 provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials. The multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent. By mass percentage, the solute includes: SiO2 52%, Fe3O4 16%, Y2O3 32%; the solvent is distilled water at 44°C.

[0169] The annealed coated stainless steel welding material of Comparative Example 6 had a 9% loss rate when ground to a bright finish, a 1.0 mm forging edge crack, and surface quality cracking of the coating.

[0170] As can be seen from the comparison between Examples 6-8 and Comparative Examples 5-6, after adopting the coating solute component of the technical solution of the present invention, the ratio of coating solute to solvent has little effect on the final high-temperature oxidation resistance effect, which further illustrates the effectiveness of the component.

[0171] It should be noted that this high-temperature oxidation-resistant coating and its application method are also applicable to the pretreatment of other types of stainless steel under homogenization conditions of 700-1150℃ and no more than 10 hours. Experiments have shown that welding wire rods coated with the coating proposed in this invention and subjected to the same treatment steps can achieve an annealing temperature limit of 1200℃, with a typical operating temperature below 1150℃.

[0172] Example 9

[0173] This embodiment provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, wherein the stainless steel welding material is Cr14Ni5 grade stainless steel; the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; by mass percentage, the solute includes: SiO2 63%, Fe3O4 9%, Y2O3 25%; the solvent is distilled water at 40°C.

[0174] The volume ratio of the solute to the solvent is 1:2.1.

[0175] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0176] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0177] S2. Weighing and heating of solvent: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a temperature of 40℃ for 70 minutes to obtain the heated solvent.

[0178] S3. Coating preparation: Dissolve the weighed solute mixture from S1 in the heated solvent from S2, stir and mix thoroughly at a stirring speed of 70 r / min for 8 min to obtain the coating product.

[0179] S4. Application of coating and preparation of coating: The coating product of S3 is applied to the surface of the stainless steel welding material to be treated by manual brushing. The coating thickness on the surface of the stainless steel welding material to be treated is 80μm. The stainless steel welding material to be treated with coating is heated and baked at a heating rate of 5℃ / min, a baking temperature of 260℃, and a baking time of 70min to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with coating.

[0180] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material was subjected to a two-stage annealing homogenization treatment. The heating rate was 5℃ / min, the two-stage annealing temperatures were 1060℃ and 1100℃, and the homogenization time was 2h for both stages, resulting in annealed coated stainless steel welding material. The coating performance of the stainless steel welding material was tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, forging edge cracks, and coating surface quality.

[0181] The annealed coated stainless steel welding material prepared in this embodiment has a coating thickness of 80 μm, a coating density of 88%, a coating surface roughness of 2.3 μm, a metallurgical bond strength between the coating and the stainless steel welding material of 50 MPa, a coating hardness of 48 HRC, and the coating can withstand a high temperature of 1200℃ for 8 hours.

[0182] In this embodiment, the loss rate of annealed coated stainless steel welding materials to the point of bright welding wire rod is 1.8%, and the coating surface quality is intact.

[0183] Example 10

[0184] This embodiment provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, wherein the stainless steel welding material is 1Cr17Ni2 grade stainless steel; the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; by mass percentage, the solute includes: SiO2 65%, Fe3O4 12%, Y2O3 25%; the solvent is distilled water at 50°C.

[0185] The volume ratio of the solute to the solvent is 1:2.3.

[0186] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0187] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0188] S2. Weighing and heating of solvent: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a temperature of 42℃ for 80 minutes to obtain the heated solvent.

[0189] S3. Coating preparation: Dissolve the weighed solute mixture of S1 in the heated solvent of S2, stir and mix well at a stirring speed of 100 r / min for 10 min to obtain the coating product.

[0190] S4. Application of coating and preparation of coating: The coating product of S3 is applied to the surface of the stainless steel welding material to be treated by manual brushing. The coating thickness on the surface of the stainless steel welding material to be treated is 70μm. The stainless steel welding material to be treated with coating is heated and baked at a heating rate of 4 / min, a baking temperature of 300℃, and a baking time of 80min to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with coating.

[0191] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material was subjected to a two-stage annealing homogenization treatment. The heating rate was 3.5℃ / min, the two-stage annealing temperatures were 1060℃ and 1100℃, and the homogenization time was 2h for both stages, resulting in annealed coated stainless steel welding material. The coating performance of the stainless steel welding material was tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, forging edge cracks, and coating surface quality.

[0192] The annealed coated stainless steel welding material prepared in this embodiment has a coating thickness of 70 μm, a coating density of 87%, a coating surface roughness of 2.0 μm, a metallurgical bond strength between the coating and the stainless steel welding material of 35 MPa, a coating hardness of 38 HRC, and the coating can withstand a high temperature of 1160℃ for 24 hours.

[0193] In this embodiment, the loss rate of annealed coated stainless steel welding materials to the point of bright welding wire rod is 2.0%, and the coating surface quality is intact.

[0194] Example 11

[0195] This embodiment provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, wherein the stainless steel welding material is 1Cr18Ni9Ti stainless steel; the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; by mass percentage, the solute includes: SiO2 67%, Fe3O4 13%, Y2O3 20%; the solvent is distilled water at 45°C.

[0196] The volume ratio of the solute to the solvent is 1:2.2.

[0197] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0198] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0199] S2. Weighing and heating of solvent: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a temperature of 45℃ for 100 minutes to obtain the heated solvent.

[0200] S3. Coating preparation: Dissolve the weighed solute mixture of S1 in the heated solvent of S2, stir and mix well at a stirring speed of 80 r / min for 3 min to obtain the coating product.

[0201] S4. Application of coating and preparation of coating: The coating product of S3 is applied to the surface of the stainless steel welding material to be treated by manual brushing. The coating thickness on the surface of the stainless steel welding material to be treated is 65μm. The coated stainless steel welding material to be treated is heated and baked at a heating rate of 4.5 / min, a baking temperature of 280℃, and a baking time of 70min to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with coating.

[0202] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material was subjected to a two-stage annealing homogenization treatment. The heating rate was 4℃ / min, the two-stage annealing temperatures were 1060℃ and 1100℃, and the homogenization time was 2h for both stages, resulting in annealed coated stainless steel welding material. The coating performance of the stainless steel welding material was tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, forging edge cracks, and coating surface quality.

[0203] The annealed coated stainless steel welding material prepared in this embodiment has a coating thickness of 65 μm, a coating density of 88%, a coating surface roughness of 1.8 μm, a metallurgical bond strength between the coating and the stainless steel welding material of 30 MPa, a coating hardness of 46 HRC, and the coating can withstand a high temperature of 1150℃ for 48 hours.

[0204] In this embodiment, the loss rate of annealed coated stainless steel welding materials to the point of bright welding wire rod is 2.0%, and the coating surface quality is intact.

[0205] Example 12

[0206] This embodiment provides a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, wherein the stainless steel welding material is 2Cr13 grade stainless steel; the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials includes a solute and a solvent; by mass percentage, the solute includes: SiO2 65%, Fe3O4 13%, Y2O3 25%; the solvent is distilled water at 42°C.

[0207] The volume ratio of the solute to the solvent is 1:2.1.

[0208] A process method for a multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the process method comprising the following steps:

[0209] S1. Solute ratio and weighing: According to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding materials, the raw materials are proportioned and weighed to obtain a well-weighed solute mixture.

[0210] S2. Weighing and heating of solvent: Select the required solvent based on the solute mixture and stainless steel welding material weighed in S1. After weighing the solvent, heat and keep it at a temperature of 45℃ for 110 minutes to obtain the heated solvent.

[0211] S3. Coating preparation: Dissolve the weighed solute mixture from S1 in the heated solvent from S2, stir and mix thoroughly at a stirring speed of 70 r / min for 7 min to obtain the coating product.

[0212] S4. Application of coating and preparation of coating: The coating product of S3 is applied to the surface of the stainless steel welding material to be treated by manual brushing. The coating thickness on the surface of the stainless steel welding material to be treated is 90μm. The stainless steel welding material to be treated with coating is heated and baked at a heating rate of 3℃ / min, a baking temperature of 280℃, and a baking time of 7min to obtain a high-temperature resistant and oxidation-resistant stainless steel welding material with coating.

[0213] S5. Coating annealing homogenization treatment and performance testing: The S4 high-temperature resistant and oxidation-resistant coated stainless steel welding material was subjected to a two-stage annealing homogenization treatment. The heating rate was 4.5℃ / min, the two-stage annealing temperatures were 1060℃ and 1100℃, and the homogenization time was 2h for both stages, resulting in annealed coated stainless steel welding material. The coating performance of the stainless steel welding material was tested, including the loss rate after grinding to a bright welding wire rod, cold-drawn surface cracks, forging edge cracks, and coating surface quality.

[0214] The annealed coated stainless steel welding material prepared in this embodiment has a coating thickness of 90 μm, a coating density of 88%, a coating surface roughness of 1.6 μm, a metallurgical bond strength between the coating and the stainless steel welding material of 32 MPa, a coating hardness of 48 HRC, and the coating can withstand a high temperature of 1190℃ for 24 hours.

[0215] In this embodiment, the loss rate of annealed coated stainless steel welding materials to a bright welding wire rod is 2.1%, and the coating surface quality is intact.

[0216] The above-mentioned solution proposes a multi-element antioxidant coating and process for high-temperature annealing of stainless steel welding materials, which can solve the technical problems of weak antioxidant capacity, easy peeling and uneven protection in the selection of antioxidant coating components and preparation methods in high-temperature complex environments in the prior art.

[0217] This invention achieves superior oxidation resistance in coated stainless steel welding wire rods by precisely controlling the proportions of each component in the mixed coating and employing application techniques specifically designed for this coating, thus demonstrating its significant technical advantages. This solution not only enhances the protective effect of the coating but also ensures its stability and durability under high-temperature environments, providing a more reliable protective solution for the application of stainless steel welding wire.

[0218] The main materials selected in the mixed coating of this invention are SiO2, Fe3O4, and Y2O3. Among them, SiO2 can improve the anti-oxidation effect and mechanical strength of the coating; Fe3O4 melts at high temperature to form an inert protective film that reduces the penetration of oxygen and other corrosive gases, and isolates and slows down the oxidation of the underlying material; Y2O3 can synergistically enhance the overall anti-oxidation ability of the coating with Fe3O4 and make the high-temperature structure of the coating stable.

[0219] This invention, by baking the coating on the surface of stainless steel welding materials, enables the coating to adhere to the surface of the wire rod and obtain a certain bonding strength, thereby protecting the surface of the wire rod from high-temperature oxidation.

[0220] The present invention enables the coating to be cured on the surface of the wire rod and further improves the bonding strength through annealing homogenization treatment.

[0221] In summary, compared to existing methods for selecting and preparing antioxidant coatings for high-temperature and complex environments, the method of this invention, by using specific coatings and corresponding application methods, allows stainless steel welding wire rods to withstand longer annealing heat treatment times while maintaining surface quality. This effectively reduces the erosion and oxidation of the welding wire rod surface by high-temperature furnace gases, minimizing subcutaneous oxidation cracks and element depletion. On the one hand, it reduces the risk of cracking during cold drawing; on the other hand, it effectively reduces grinding work, saves time, and improves the overall yield, effectively saving production costs and improving the economic benefits for enterprises. Therefore, this method is simple in process, easy to operate, allows for convenient improvement of the device structure, is low in cost, and highly efficient, making it suitable for large-scale industrial production and widespread application.

[0222] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. Additionally, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects, but it can also represent an "and / or" relationship. Please refer to the context for a more accurate understanding.

[0223] In this invention, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be a single item or multiple items.

[0224] It should be understood that, in various embodiments of the present invention, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0225] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multicomponent antioxidant coating for high-temperature annealing of stainless steel welding materials, characterized by The multi-element antioxidant coating for high-temperature annealing of stainless steel welding material comprises a solute and a solvent; the solute comprises, in terms of mass percentage, SiO2 62-69%, Fe3O4 8-14%, and Y2O3 17-30%; and the solvent is water.

2. The multi-component antioxidant coating material for stainless steel welding material high-temperature annealing according to claim 1, characterized by The volume ratio of the solute to the solvent is 1:1.15-1:2.

30.

3. The multi-component antioxidant coating material for stainless steel welding material high-temperature annealing according to claim 1, characterized by The water is deionized water or distilled water, and the temperature is 40-50°C.

4. The multi-component antioxidant coating material for stainless steel welding material high-temperature annealing according to claim 1, characterized by The loss rate of the stainless steel welding material after protection by the multi-element antioxidant coating for high-temperature annealing of stainless steel welding material is 1.5-2.5% after grinding to a bright wire rod, and the cold-drawing surface is free of cracks, and the coating surface quality is complete.

5. A process for applying a multi-element antioxidant coating to stainless steel welding materials for high temperature annealing based on the stainless steel welding material of claim 1, characterized by, The process comprises the following steps: S1, proportioning and weighing of the solute: the raw materials are proportioned and weighed according to the solute of the multi-element antioxidant coating for high-temperature annealing of stainless steel welding material, to obtain a weighed solute mixture; S2, weighing and heating of the solvent: the required solvent is weighed according to the weighed solute mixture of S1 and the stainless steel welding material, and the weighed solvent is heated and kept, to obtain a heated solvent; S3, preparation of the coating: the weighed solute mixture of S1 is dissolved in the heated solvent of S2, and stirred and mixed uniformly, to obtain a coating product; S4, use of the coating and preparation of the coating layer: the coating product of S3 is coated on the surface of the stainless steel welding material to be treated, and the stainless steel welding material coated with the coating is heated and baked, to obtain a high-temperature oxidation-resistant stainless steel welding material with a coating layer; S5, annealing homogenization treatment of the coating layer and performance detection: the high-temperature oxidation-resistant stainless steel welding material with the coating layer of S4 is subjected to annealing homogenization treatment, to obtain an annealed stainless steel welding material with a coating layer; and the coating performance of the stainless steel welding material is detected, including the loss rate after grinding to a bright wire rod, the cold-drawing surface cracks, the forging edge cracks, and the coating surface quality.

6. The process for the multi-element antioxidant coating for stainless steel welding material for high temperature annealing according to claim 5, characterized in that, In the proportioning of the raw materials of S1, the solute comprises SiO2 64-66%, Fe3O4 10-12%, and Y2O3 19-25%.

7. The process for the multi-element antioxidant coating for stainless steel welding material for high temperature annealing according to claim 5, characterized in that, The heating and keeping temperature of S2 is 40-46°C, and the keeping time is 60-120 min.

8. The process for preparing a multicomponent antioxidant coating for stainless steel welding materials for high temperature annealing according to claim 5, characterized in that, The stirring speed of S3 is 60-100 r / min, and the stirring and mixing time is 5-10 min.

9. The process for the multi-element antioxidant coating for stainless steel welding material for high temperature annealing according to claim 5, characterized in that, The coating method of S4 is manual brushing with a brush, the thickness of the coating product on the surface of the stainless steel welding material to be treated is 50-200 μm, the heating rate of the heating and baking is 3-5°C / min, the baking temperature is 250-300°C, and the baking time is 60-80 min.

10. The process for the multi-element antioxidant coating for stainless steel welding material for high temperature annealing according to claim 5, characterized in that, The heating rate of the annealing homogenization treatment of S5 is 3-5°C / min, the annealing temperature is 900-1050°C, and the homogenization time is 2-5 h.

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