Steel billet anti-oxidation coating material, preparation method and steel

Abstract

The invention discloses a steel billet anti-oxidation coating material, a preparation method and steel, the steel billet anti-oxidation coating material is characterized in that the steel billet anti-oxidation coating material comprises steel slag powder, ceramic powder and a high-temperature-resistant adhesive, and the ceramic powder comprises aluminum oxide powder, zirconium oxide powder, magnesium oxide powder, silicon oxide powder, calcium oxide powder and titanium oxide powder; wherein the mass ratio of the steel slag powder to the ceramic powder is 1: (1.6-1.8); based on the steel billet anti-oxidation coating material, the weight percentage of the high-temperature-resistant adhesive is 20-35%. The steel billet anti-oxidation coating material is scientific and reasonable in proportioning, the steel billet is coated with the steel billet anti-oxidation coating material, the use requirement for spraying at the high temperature is met, the special requirements for coating compactness, high temperature resistance, oxidation resistance and other performance of steel at the temperature not exceeding 1300 DEG C are met, and an anti-oxidation coating formed on the surface of a steel ingot or the steel billet does not crack.

Description

Technical Field

[0001] The present application belongs to the technical field of iron and steel metallurgy, and specifically relates to a steel billet anti-oxidation coating material, a preparation method and a steel material. Background Art

[0002] The surface of the steel billet is directly exposed to the air and is prone to oxidation reaction. The anti-oxidation coating on the surface of the steel billet can effectively isolate the contact between the air and the steel surface, prevent the occurrence of oxidation reaction, and thus extend the service life of the steel. At the same time, the anti-oxidation coating can protect the surface of the steel billet from erosion and pollution from the external environment, maintain the smoothness, flatness and mechanical properties of the steel surface, and facilitate the subsequent processing and manufacturing process. However, after the existing coating materials are coated on the surface of the steel billet, they are prone to cracks, and the coating has poor density and cannot meet the special requirements of high temperature resistance and oxidation resistance. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the purpose of the present application is to propose a billet anti-oxidation coating material, a preparation method and a steel material, to propose a billet anti-oxidation coating material with scientific and reasonable ingredients, and to apply it to the billet, to achieve the use requirements of spraying at high temperature, to meet the special requirements of the coating density, high temperature resistance and anti-oxidation performance of the steel material at a temperature not exceeding 1300°C, and the anti-oxidation coating formed on the surface of the ingot or billet does not crack.

[0004] To achieve the above-mentioned purpose, according to the first aspect of the present application, a steel billet anti-oxidation coating material is proposed, comprising steel slag powder, ceramic powder and a high-temperature resistant adhesive, wherein the ceramic powder comprises aluminum oxide powder, zirconium oxide powder, magnesium oxide powder, silicon oxide powder, calcium oxide powder and titanium oxide powder; wherein the mass ratio of the steel slag powder to the ceramic powder is 1:1.6-1.8; based on the steel billet anti-oxidation coating material, the weight percentage of the high-temperature resistant adhesive is 20-35%.

[0005] In some embodiments, the weight ratio of the aluminum oxide powder and the zirconium oxide powder is 7-10:3; the weight ratio of the magnesium oxide powder, the silicon oxide powder, the calcium oxide powder and the titanium oxide powder is 0.5:3:1:(0.1-0.5); wherein the zirconium oxide powder has the same weight as the titanium oxide powder.

[0006] In some embodiments, the high temperature adhesive includes silica sol, aluminum sol and aluminum dihydrogen phosphate solution.

[0007] In some embodiments, the weight fraction ratio of silica sol, alumina sol and aluminum dihydrogen phosphate solution is 5:1:(0.1-0.3).

[0008] According to the second aspect of the present application, a method for preparing a steel billet anti-oxidation coating material is proposed, comprising the following steps: Add ceramic powder into high temperature resistant adhesive, mix and stir evenly to form preliminary coating; The steel slag powder is crushed into powder with a mesh size below 200, and then added into the prepared preliminary coating, and stirred evenly to obtain the steel billet anti-oxidation coating material described in any of the above embodiments.

[0009] According to the third aspect of the present application, a high-temperature oxidation resistant steel material comprises a steel ingot or a steel billet, and an anti-oxidation coating applied on the surface of the steel ingot or the steel billet, wherein the anti-oxidation coating is sprayed in multiple layers in steps using the steel billet anti-oxidation coating material described in any of the above embodiments, sprayed 2 to 10 times, each layer having a thickness of 0.1 to 0.2 mm, a total coating thickness of 0.2 to 2.0 mm, and a minimum coating thickness of 0.5 to 0.7 mm.

[0010] In some embodiments, when the anti-oxidation coating material of the steel billet is sprayed in multiple layers in steps, it is directly loaded into a furnace and heated after each spraying and drying.

[0011] In some embodiments, when the surface temperature of the steel ingot or the steel billet is greater than 300°C, the thickness of each spraying is 0.10-0.15 mm, when the surface temperature is 100-300°C, the thickness of each spraying is 0.15-0.30 mm, and when the surface temperature is less than 100°C, the thickness of each spraying is 0.30-0.40 mm.

[0012] In some embodiments, the heating time of the steel ingot or the steel billet does not exceed 6 hours.

[0013] In some embodiments, the steel has an oxidation loss of less than 0.40% within 50 hours at a temperature not exceeding 1300°C.

[0014] Compared with the prior art, this application has the following advantages and positive effects: In the present application, the anti-oxidation coating material of the steel billet is a suspension medium, which increases the dispersibility of the solid filler and does not produce precipitation, thereby ensuring good coating performance, high-temperature adhesion performance, good air insulation performance and coating construction performance.

[0015] The preparation method of the anti-oxidation coating material for steel billets in the present application fully considers the key contents such as the particle size, viscosity, surface state of the steel ingot, coating process, coating pass, and coating thickness of the coating. In the production process of the steel material resistant to high temperature oxidation, there is no need to pre-treat the steel ingot or steel billet, and it can be directly coated at high temperature. The high temperature resistant adhesive has good adhesion and protective effect and has good adhesion and coating film-forming properties. The steel slag powder melts after heating and can react with substances such as iron oxide on the surface of the steel billet to further increase the bonding force with the steel matrix. The ceramic powder ensures the heat resistance and protective effect of the coating at high temperature. In addition, there is basically no Mn element in the raw materials of the present application to prevent the Mn element from easily reacting with the silicon dioxide or air in the gaps in the anti-oxidation coating material of the steel billet, which is easy to produce cracks.

[0016] In addition, the method for forming the high-temperature oxidation-resistant steel in the present application is suitable for on-site execution, has high production efficiency, uniform coating, tight bonding, dense coating, simple process, good operation tolerance, and strong operability.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 It is a flow chart of the preparation method of the anti-oxidation coating material for steel billets proposed in this application; DETAILED DESCRIPTION

[0019] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be construed as limiting the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0020] To achieve the above-mentioned purpose, according to the first aspect of the present application, a steel billet anti-oxidation coating material is proposed, comprising steel slag powder, ceramic powder and a high-temperature resistant adhesive, the ceramic powder comprising aluminum oxide powder, zirconium oxide powder, magnesium oxide powder, silicon oxide powder, calcium oxide powder and titanium oxide powder; wherein the mass ratio of the steel slag powder to the ceramic powder is 1:1.6-1.8; based on the steel billet anti-oxidation coating material, the weight percentage of the high-temperature resistant adhesive is 20-35%.

[0021] The ceramic powder includes aluminum oxide powder, zirconium oxide powder, magnesium oxide powder, silicon oxide powder, calcium oxide powder and titanium oxide powder, wherein the weight ratio of aluminum oxide powder to zirconium oxide powder is 7-10:3; the weight ratio of magnesium oxide powder, silicon oxide powder, calcium oxide powder and titanium oxide powder is 0.5:3:1:(0.1-0.5); wherein the weight of zirconium oxide powder is the same as that of titanium oxide powder. The high temperature adhesive includes silica sol, aluminum sol and aluminum dihydrogen phosphate solution. The weight fraction ratio of silica sol, aluminum sol and aluminum dihydrogen phosphate solution is 5:1:(0.1-0.3).

[0022] For example, the weight ratio of aluminum oxide powder and zirconium oxide powder is 8:3; the weight ratio of magnesium oxide powder, silicon oxide powder, calcium oxide powder and titanium oxide powder is 0.5:3:1:0.5; the weight of zirconium oxide powder and titanium oxide powder is the same; the weight fraction ratio of silica sol, aluminum sol and aluminum dihydrogen phosphate solution is 5:1:0.3. The mass ratio of steel slag powder and ceramic powder is 1:1.6; based on the anti-oxidation coating material of the steel billet, the weight percentage of the high temperature resistant adhesive is 35%.

[0023] According to the second aspect of the present application, a method for preparing a steel billet anti-oxidation coating material is proposed, such as Figure 1 The following steps are involved: S1: adding ceramic powder into high temperature resistant adhesive, mixing and stirring evenly to form a preliminary coating; S2: Grind the steel slag powder into powder with a size of less than 200 meshes, then add it to the prepared preliminary coating, and stir evenly to obtain the steel billet anti-oxidation coating material of any of the above embodiments.

[0024] According to the third aspect of the present application, a high-temperature oxidation resistant steel material comprises a steel ingot or a steel billet, and an anti-oxidation coating applied on the surface of the steel ingot or the steel billet, wherein the anti-oxidation coating is sprayed in multiple layers in steps using the steel billet anti-oxidation coating material in any of the above-mentioned embodiments, the spraying is performed 2 to 10 times, the thickness of each layer is 0.1 to 0.2 mm, the total thickness of the coating is 0.2 to 2.0 mm, and the minimum thickness of the coating is 0.5 to 0.7 mm.

[0025] Wherein, when the anti-oxidation coating material of the steel billet is sprayed in multiple layers in steps, each spraying and drying is directly loaded into the furnace and heated. For example, the multi-layer step-by-step spraying is carried out according to the surface temperature of the steel ingot or steel billet, wherein when the surface temperature of the steel ingot or steel billet is greater than 300°C, the thickness of each spraying is 0.10-0.15mm, when the surface temperature is 100-300°C, the thickness of each spraying is 0.15-0.30mm, and when the surface temperature is less than 100°C, the thickness of each spraying is 0.30-0.40mm. Preferably, the total heating time of the steel ingot or steel billet does not exceed 6h, and the steel obtained in this application has an oxidation burn loss of less than 0.40% within 50 hours when the temperature does not exceed 1300°C.

[0026] Example 1 A steel billet anti-oxidation coating material comprises steel slag powder, ceramic powder and a high temperature resistant adhesive, wherein the mass ratio of the steel slag powder to the ceramic powder is 1:1.6; the ceramic powder comprises 7 parts of aluminum oxide powder, 3 parts of zirconium oxide powder, 15 parts of magnesium oxide powder, 90 parts of silicon oxide powder, 30 parts of calcium oxide powder and 3 parts of titanium oxide powder; based on the steel billet anti-oxidation coating material, the weight percentage of the high temperature resistant adhesive is 20%, wherein the weight fraction ratio of silica sol, aluminum sol and aluminum dihydrogen phosphate solution is 5:1:0.1.

[0027] Ceramic powder is added to the high temperature resistant adhesive, mixed and stirred to form a preliminary coating; steel slag powder is crushed into powder below 200 mesh, and then added to the prepared preliminary coating, and stirred to obtain any steel billet anti-oxidation coating material in the above embodiments. The steel ingot or steel billet is sprayed in multiple layers in steps, sprayed 3 times, each layer is 0.2mm thick, and the total coating thickness is 0.60mm. After each spraying and drying, it is directly loaded into the furnace and heated.

[0028] Example 2 A steel billet anti-oxidation coating material comprises steel slag powder, ceramic powder and a high temperature resistant adhesive, wherein the mass ratio of the steel slag powder to the ceramic powder is 1:1.8; the ceramic powder comprises 7 parts of aluminum oxide powder, 3 parts of zirconium oxide powder, 15 parts of magnesium oxide powder, 90 parts of silicon oxide powder, 30 parts of calcium oxide powder and 3 parts of titanium oxide powder; based on the steel billet anti-oxidation coating material, the weight percentage of the high temperature resistant adhesive is 20%, wherein the weight fraction ratio of silica sol, aluminum sol and aluminum dihydrogen phosphate solution is 5:1:0.1.

[0029] Ceramic powder is added to the high temperature resistant adhesive, mixed and stirred to form a preliminary coating; steel slag powder is crushed into powder below 200 mesh, and then added to the prepared preliminary coating, and stirred to obtain any steel billet anti-oxidation coating material in the above embodiments. The steel ingot or steel billet is sprayed in multiple layers in steps, sprayed 10 times, each layer is 0.1 mm thick, and the total coating thickness is 1 mm. After each spraying and drying, it is directly loaded into the furnace and heated.

[0030] Example 3 A steel billet anti-oxidation coating material comprises steel slag powder, ceramic powder and a high temperature resistant adhesive, wherein the mass ratio of the steel slag powder to the ceramic powder is 1:1.7; the ceramic powder comprises 7 parts of aluminum oxide powder, 3 parts of zirconium oxide powder, 15 parts of magnesium oxide powder, 90 parts of silicon oxide powder, 30 parts of calcium oxide powder and 3 parts of titanium oxide powder; based on the steel billet anti-oxidation coating material, the weight percentage of the high temperature resistant adhesive is 20%, wherein the weight fraction ratio of silica sol, aluminum sol and aluminum dihydrogen phosphate solution is 5:1:0.1.

[0031] Add ceramic powder to high temperature resistant adhesive, mix and stir to make preliminary coating; crush steel slag powder into powder below 200 mesh, then add it to the prepared preliminary coating, stir to get any anti-oxidation coating material of steel billet in the above embodiment. The steel ingot or steel billet is sprayed in multiple layers and steps, the surface temperature of the steel ingot or steel billet is less than 100℃, the spraying thickness is 0.30mm, and it is directly loaded into the furnace and heated after spraying and drying. This process can be carried out many times, for example, heating for 1 hour at this stage, then the surface temperature of the steel ingot or steel billet is 100-300℃, the spraying thickness is 0.15mm, and it is directly loaded into the furnace after spraying and drying. This process can be carried out many times, for example, heating for 1.5 hours at this stage; finally, when the surface temperature of the steel ingot or steel billet is greater than 300℃, the spraying thickness is 0.10mm each time, and it is directly loaded into the furnace after spraying and drying. This process can be carried out many times, for example, heating for 2 hours at this stage.

[0032] Example 4 A steel billet anti-oxidation coating material comprises steel slag powder, ceramic powder and a high temperature resistant adhesive, wherein the mass ratio of the steel slag powder to the ceramic powder is 1:1.7; the ceramic powder comprises 7 parts of aluminum oxide powder, 3 parts of zirconium oxide powder, 15 parts of magnesium oxide powder, 90 parts of silicon oxide powder, 30 parts of calcium oxide powder and 3 parts of titanium oxide powder; based on the steel billet anti-oxidation coating material, the weight percentage of the high temperature resistant adhesive is 25%, wherein the weight fraction ratio of silica sol, aluminum sol and aluminum dihydrogen phosphate solution is 5:1:0.2.

[0033] Ceramic powder is added to the high temperature resistant adhesive, mixed and stirred to form a preliminary coating; steel slag powder is crushed into powder below 200 mesh, and then added to the prepared preliminary coating, and stirred to obtain any of the anti-oxidation coating materials for steel billets in the above embodiments. The steel ingot or steel billet is sprayed in multiple layers and steps, the surface temperature of the steel ingot or steel billet is less than 100°C, the spraying thickness is 0.40mm, and the furnace is directly loaded and heated after the spraying and drying are completed. This process can be carried out multiple times, for example, heating for 1 hour at this stage, and then the surface temperature of the steel ingot or steel billet is 100-300°C, the spraying thickness is 0.2mm, and the furnace is directly loaded after the spraying and drying are completed. This process can be carried out multiple times, for example, heating for 1.5 hours at this stage; finally, when the surface temperature of the steel ingot or steel billet is greater than 300°C, the spraying thickness is 0.15mm each time, and the furnace is directly loaded after the spraying and drying are completed. This process can be carried out multiple times, for example, heating for 3 hours at this stage.

[0034] Example 5 A steel billet anti-oxidation coating material comprises steel slag powder, ceramic powder and a high temperature resistant adhesive, wherein the mass ratio of the steel slag powder to the ceramic powder is 1:1.7; the ceramic powder comprises 10 parts of aluminum oxide powder, 3 parts of zirconium oxide powder, 15 parts of magnesium oxide powder, 90 parts of silicon oxide powder, 30 parts of calcium oxide powder and 3 parts of titanium oxide powder; based on the steel billet anti-oxidation coating material, the weight percentage of the high temperature resistant adhesive is 35%, wherein the weight fraction ratio of silica sol, aluminum sol and aluminum dihydrogen phosphate solution is 5:1:0.5.

[0035] Ceramic powder is added to the high temperature resistant adhesive, mixed and stirred to form a preliminary coating; steel slag powder is crushed into powder below 200 mesh, and then added to the prepared preliminary coating, and stirred to obtain any of the anti-oxidation coating materials for steel billets in the above embodiments. The steel ingot or steel billet is sprayed in multiple layers and steps, the surface temperature of the steel ingot or steel billet is less than 100°C, the spraying thickness is 0.40mm, and the furnace is directly loaded and heated after the spraying and drying are completed. This process can be carried out multiple times, for example, heating for 1 hour at this stage, and then the surface temperature of the steel ingot or steel billet is 100-300°C, the spraying thickness is 0.2mm, and the furnace is directly loaded after the spraying and drying are completed. This process can be carried out multiple times, for example, heating for 1.5 hours at this stage; finally, when the surface temperature of the steel ingot or steel billet is greater than 300°C, the spraying thickness is 0.15mm each time, and the furnace is directly loaded after the spraying and drying are completed. This process can be carried out multiple times, for example, heating for 3 hours at this stage.

[0036] Oxidation experiments were conducted on the steels formed in Examples 1 to 5, wherein the oxidation loss of the steels was less than 0.40% within 50 hours at a temperature not exceeding 1300°C.

[0037] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0038] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0040] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A steel billet anti-oxidation coating material, characterized in that: It includes steel slag powder, ceramic powder and high temperature resistant adhesive, wherein the ceramic powder includes aluminum oxide powder, zirconium oxide powder, magnesium oxide powder, silicon oxide powder, calcium oxide powder and titanium oxide powder; wherein the mass ratio of the steel slag powder to the ceramic powder is 1:1.6-1.8; based on the steel billet anti-oxidation coating material, the weight percentage of the high temperature resistant adhesive is 20-35%.

2. The steel billet anti-oxidation coating material according to claim 1, characterized in that: The weight ratio of the aluminum oxide powder to the zirconium oxide powder is 7-10:3; the weight ratio of the magnesium oxide powder, the silicon oxide powder, the calcium oxide powder and the titanium oxide powder is 0.5:3:1:(0.1-0.5); wherein the weight of the zirconium oxide powder is the same as that of the titanium oxide powder.

3. The steel billet anti-oxidation coating material according to claim 1, characterized in that: The high temperature adhesive includes silica sol, aluminum sol and aluminum dihydrogen phosphate solution.

4. The steel billet anti-oxidation coating material according to claim 1, characterized in that: The weight fraction ratio of silica sol, aluminum sol and aluminum dihydrogen phosphate solution is 5:1:(0.1-0.3).

5. A method for preparing a steel billet anti-oxidation coating material, characterized in that: The following steps are involved: Add ceramic powder into high temperature resistant adhesive, mix and stir evenly to form preliminary coating; The steel slag powder is crushed into powder with a size of less than 200 meshes, and then added into the prepared preliminary coating, and stirred evenly to obtain the steel billet anti-oxidation coating material as claimed in any one of claims 1 to 4.

6. A steel material resistant to high temperature oxidation, characterized in that: It comprises a steel ingot or a steel billet, and an anti-oxidation coating applied on the surface of the steel ingot or the steel billet, wherein the anti-oxidation coating is sprayed in multiple layers in steps using the steel billet anti-oxidation coating material described in any one of claims 1 to 4, sprayed 2 to 10 times, each layer has a thickness of 0.1 to 0.2 mm, the total coating thickness is 0.2 to 2.0 mm, and the minimum coating thickness is 0.5 to 0.7 mm.

7. The steel material according to claim 6, characterized in that: When the steel billet anti-oxidation coating material is sprayed in multiple layers in steps, it is directly loaded into a furnace and heated after each spraying and drying.

8. The steel material according to claim 5, characterized in that: When the surface temperature of the steel ingot or the steel billet is greater than 300°C, the thickness of each spraying is 0.10-0.15mm; when the surface temperature is 100-300°C, the thickness of each spraying is 0.15-0.30mm; when the surface temperature is less than 100°C, the thickness of each spraying is 0.30-0.40mm.

9. The steel material according to claim 5, characterized in that: The heating time of the steel ingot or the steel billet does not exceed 6 hours.

10. The steel material according to claim 5, characterized in that: When the temperature does not exceed 1300° C., the oxidation loss of the steel is less than 0.40% within 50 hours.

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