Welding wire, flux cored and deposited metal suitable for welding 09CrCuSb steel

Abstract

The application provides a welding wire, a flux core and a cladding metal suitable for welding of 09CrCuSb steel, and belongs to the field of welding materials.The raw material of the flux core comprises, in weight parts, 3.0-6.0 parts of natural rutile, 1-3 parts of 75# ferrosilicon powder, 0.2-0.5 parts of sodium titanate, 0.1-0.3 parts of aluminum powder, 0.2-0.3 parts of fluoride, 1-3 parts of manganese iron powder, 0.6-1.2 parts of metallic chromium, 0.20-0.80 parts of copper powder, 0.2-0.4 parts of ferrochrome, 0.2-0.5 parts of quartz sand, 0.1-0.3 parts of antimony powder, 0.8-1.8 parts of iron powder and 0.4-1.0 parts of electrolytic manganese, so as to solve the problem of poor sulfuric acid dew point corrosion resistance of the cladding metal formed by welding of 09CrCuSb steel in the prior art.

Description

Technical Field

[0001] This application relates to the field of welding materials technology, and in particular to a welding wire, flux core and cladding metal suitable for welding 09CrCuSb steel. Background Technology

[0002] Sulfuric acid dew point corrosion resistant steel (09CrCuSb) can be used to manufacture metal structural parts with certain requirements for sulfuric acid corrosion resistance, such as flue and chimney structures in the power industry; boiler preheaters and economizers, plate heat exchangers, air preheater heat exchange elements, pipelines or condensation dehumidification devices in the metallurgical and chemical industries; and acid- and heat-resistant structural parts for baking equipment.

[0003] Sulfuric acid dew point corrosion can cause severe damage to equipment in the aforementioned industries. An effective method to address the issue of sulfuric acid dew point corrosion in steel is to reduce the amount of SO2 and sulfuric acid formation in the flue gas by decreasing the sulfur content during combustion. However, this approach is difficult to implement and its effectiveness is limited by factors such as raw material supply, operational feasibility, and thermal efficiency. Alternatively, using enamel or non-metallic coatings can mitigate sulfuric acid dew point corrosion to some extent, but this is difficult to apply and affects heat exchange efficiency. The ideal solution is for the steel material itself to possess sulfuric acid dew point corrosion resistance. Under these conditions, it is necessary to develop appropriate welding materials for 09CrCuSb steel to achieve the same sulfuric acid dew point corrosion resistance as the base material. Summary of the Invention

[0004] This application provides a welding wire, flux core, and cladding metal suitable for welding 09CrCuSb steel, in order to solve the technical problem that the cladding metal formed by welding 09CrCuSb steel has poor resistance to sulfuric acid dew point corrosion in the prior art.

[0005] In a first aspect, this application provides a flux core suitable for welding 09CrCuSb steel, wherein the raw materials of the flux core comprise, by weight:

[0006] Natural rutile: 3.0-6.0 parts, 75# ferrosilicon powder: 1-3 parts, sodium titanate: 0.2-0.5 parts, aluminum powder: 0.1-0.3 parts, fluoride: 0.2-0.3 parts, ferromanganese powder: 1-3 parts, metallic chromium: 0.6-1.2 parts, copper powder: 0.20-0.80 parts, ferrochrome: 0.2-0.4 parts, quartz sand: 0.2-0.5 parts, antimony powder: 0.1-0.3 parts, iron powder: 0.8-1.8 parts, electrolytic manganese: 0.4-1.0 parts.

[0007] Optionally, the raw materials for the drug core are, by weight:

[0008] Natural rutile: 3.0 parts, 75# ferrosilicon powder: 1 part, sodium titanate: 0.2 parts, aluminum powder: 0.1 parts, fluoride: 0.2 parts, ferromanganese powder: 1 part, metallic chromium: 0.6 parts, copper powder: 0.20 parts, ferrochrome: 0.2 parts, quartz sand: 0.2 parts, antimony powder: 0.1 parts, iron powder: 0.8 parts, electrolytic manganese: 0.4 parts; or,

[0009] Natural rutile: 4.5 parts, 75# ferrosilicon powder: 2 parts, sodium titanate: 0.35 parts, aluminum powder: 0.2 parts, fluoride: 0.25 parts, ferromanganese powder: 2 parts, metallic chromium: 0.9 parts, copper powder: 0.5 parts, ferrochrome: 0.3 parts, quartz sand: 0.35 parts, antimony powder: 0.2 parts, iron powder: 1.3 parts, electrolytic manganese: 0.7 parts; or,

[0010] Natural rutile: 6.0 parts, 75# ferrosilicon powder: 3 parts, sodium titanate: 0.5 parts, aluminum powder: 0.3 parts, fluoride: 0.3 parts, ferromanganese powder: 3 parts, metallic chromium: 1.2 parts, copper powder: 0.80 parts, ferrochrome: 0.4 parts, quartz sand: 0.5 parts, antimony powder: 0.3 parts, iron powder: 1.8 parts, electrolytic manganese: 1.0 parts.

[0011] Secondly, this application provides a welding wire suitable for welding 09CrCuSb steel, the welding wire comprising a steel outer sheath and a flux core as described in the embodiments of the first aspect.

[0012] Optionally, the weight of the flux core is 10% to 20% of the weight of the welding wire.

[0013] Optionally, the filling rate of the flux core is 10% to 20%; the wire diameter of the welding wire is 1.20 mm to 2.40 mm.

[0014] Optionally, the chemical composition of the steel outer skin, expressed as a mass fraction, is as follows:

[0015] C: 0.01%–0.04%, Mn: 0.10%–0.40%, Si≤0.04%, S≤0.03%, P≤0.03%, with the balance being iron powder and unavoidable impurities.

[0016] Optionally, the chemical composition of the steel outer skin, expressed as a mass fraction, is as follows:

[0017] C: 0.029%, Mn: 0.28%, Si: 0.02%, S: 0.008%, P: 0.011%, balance being iron and unavoidable impurities.

[0018] Thirdly, this application provides a cladding metal suitable for welding 09CrCuSb steel, wherein the cladding metal is prepared by welding wire as described in any embodiment of the second aspect during the welding process.

[0019] Optionally, the chemical composition of the deposited metal, in mass fraction, includes:

[0020] C≤0.18%, Mn≤2.0%, Si≤0.90%, S≤0.030%, P≤0.030%, Cr: 0.7%~1.10%, Cu: 0.25%~0.45%, Sb: 0.04%~0.10%.

[0021] Optionally, the deposited metal satisfies at least one of the following properties: tensile strength R m The yield strength is 490MPa to 670MPa, and the yield strength R is... el ≥390MPa, elongation A≥18%, impact energy at -30℃ A KV2 ≥27J, diffusible hydrogen content <5mL / 100g.

[0022] The technical solutions provided in this application have the following advantages compared with the prior art:

[0023] This application provides a flux core suitable for welding 09CrCuSb steel. The raw materials of the flux core are rationally designed, with the addition of 75# ferrosilicon powder as a deoxidizer and alloying agent for the weld metal; and the addition of metallic chromium and copper powder to improve the sulfuric acid dew point corrosion resistance of the deposited metal. Through the organic combination of the flux core raw materials, the deposited metal after welding meets the following properties: tensile strength R... m The yield strength is 490MPa to 670MPa, and the yield strength R is... el ≥390MPa, elongation A≥18%, impact energy at -30℃ A KV2 ≥27J, diffusible hydrogen content <5mL / 100g. Effectively improves the overall performance of the weld and solves the problems of insufficient low-temperature toughness and resistance to sulfuric acid dew point corrosion in the weld metal. Excellent welding process performance, stable arc, minimal spatter, and aesthetically pleasing weld formation. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic flowchart illustrating a method for preparing welding wire suitable for welding 09CrCuSb steel, provided in an embodiment of this application. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.

[0029] Furthermore, in the description of this application, the terms "comprising," "including," etc., mean "including but not limited to." In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this document, "and / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. In this document, "at least one" means one or more, and "more than" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c" or "at least one of a, b, and c" can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be a single or multiple.

[0030] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0031] This application provides a flux core suitable for welding 09CrCuSb steel. The raw materials of the flux core, by weight, include: natural rutile: 3.0 to 6.0 parts, 75# ferrosilicon powder: 1 to 3 parts, sodium titanate: 0.2 to 0.5 parts, aluminum powder: 0.1 to 0.3 parts, fluoride: 0.2 to 0.3 parts, ferromanganese powder: 1 to 3 parts, metallic chromium: 0.6 to 1.2 parts, copper powder: 0.20 to 0.80 parts, ferrochrome: 0.2 to 0.4 parts, quartz sand: 0.2 to 0.5 parts, antimony powder: 0.1 to 0.3 parts, iron powder: 0.8 to 1.8 parts, and electrolytic manganese: 0.4 to 1.0 parts.

[0032] The positive effects of controlling the weight of natural rutile to 3.0 to 6.0 parts: Its main chemical component is titanium dioxide (TiO2), which primarily acts as an arc stabilizer and slag-forming agent, ensuring a stable arc and fine weld formation. For example, the weight of this natural rutile can be 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, or 6.0 parts, etc.

[0033] The positive effects of controlling the weight of 75# ferrosilicon powder to 1 to 3 parts: The specific composition range of 75# ferrosilicon powder is: Si≥75%, Al≥1.5%, Ca≤0.06%, Mg≤0.05%, Mn≤0.25%, P≤0.04%, Al+Si≤1.7%, Ti≤0.10%. Silicon is an important deoxidizer and also an important alloying agent for weld metal. Adding silicon to the weld can increase the number of acicular ferrite in the weld metal, reduce the oxygen content of the weld metal, and improve the impact toughness of the weld metal, but too high a content has the opposite effect; using silicon-manganese combined deoxidation has a better effect. For example, the weight of 5# ferrosilicon powder is 1 part, 1.5 parts, 2.0 parts, 2.5 parts, 2.8 parts, 3 parts, etc.

[0034] The positive effects of controlling the weight of sodium titanate to 0.2 to 0.5 parts: Sodium titanate plays a good role in stabilizing the arc. If too little is added, the arc stabilizing effect is poor; if too much is added, it is easy to absorb moisture and cause porosity. For example, the weight of sodium titanate is 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, etc.

[0035] The positive effects of controlling the weight of aluminum powder to 0.1 to 0.3 parts are as follows: Aluminum powder mainly plays a role in preliminary deoxidation. Too little aluminum powder can easily lead to insufficient deoxidation, while too much aluminum powder can cause excessive welding force and increased spatter. For example, the weight of aluminum powder can be 0.1, 0.15, 0.2, 0.25, or 0.3 parts.

[0036] The positive effects of controlling the weight of fluoride to 0.2 to 0.3 parts are as follows: fluoride can reduce the diffusible hydrogen content in the weld; too little fluoride will not reduce diffusible hydrogen, while too much fluoride will worsen the arc and reduce arc stability. For example, the weight of fluoride can be 0.2 parts, 0.25 parts, 0.28 parts, 0.3 parts, etc.

[0037] The positive effect of controlling the weight of ferromanganese powder to be 1 to 3 parts is that ferromanganese mainly plays a deoxidizing role. For example, the weight of the ferromanganese powder is 1 part, 1.2 parts, 1.6 parts, 1.8 parts, 2.0 parts, 2.2 parts, 2.4 parts, 2.8 parts, 3 parts, etc.

[0038] The positive effects of controlling the weight of metallic chromium to 0.6 to 1.2 parts: Cr is one of the main elements forming rust layers, and as a necessary additive, it improves resistance to sulfuric acid dew point corrosion. For example, the weight of metallic chromium is 0.6 to 1.2 parts.

[0039] The positive effects of controlling the weight of copper powder to be 0.20 to 0.80 parts: Adding copper powder to the flux core can improve the corrosion resistance of the deposited metal to sulfuric acid corrosion. For example, the weight of the copper powder is 0.20 parts, 0.30 parts, 0.40 parts, 0.50 parts, 0.6 parts, 0.7 parts, 0.8 parts, etc.

[0040] The positive effects of controlling the weight of ferrochrome to 0.2 to 0.4 parts are as follows: Cr powder improves weld strength on the one hand, and plays a very important role as an important corrosion-resistant element on the other. For example, the weight of ferrochrome can be 0.2 parts, 0.25 parts, 0.3 parts, 0.4 parts, etc.

[0041] The positive effects of controlling the weight of quartz sand to 0.2 to 0.5 parts are as follows: Quartz sand can play a role in slag formation and arc stabilization. If there is too little, the arc stabilization effect is not obvious; if there is too much, excessive oxides will cause the arc to soften and the operation performance to deteriorate. For example, the weight of quartz sand can be 0.2 parts, 0.3 parts, 0.4 parts, 0.45 parts, 0.5 parts, etc.

[0042] Positive effects of controlling the antimony powder weight to 0.1 to 0.3 parts: For example, the antimony powder weight can be 0.1 parts, 0.15 parts, 0.20 parts, 0.25 parts, 0.3 parts, etc.

[0043] The positive effects of controlling the weight of iron powder to be 0.8 to 1.8 parts: Antimony powder, as an important corrosion-resistant element, plays a very important role. For example, the weight of the iron powder can be 0.8 parts, 0.9 parts, 1.0 parts, 1.2 parts, 1.4 parts, 1.6 parts, 1.7 parts, 1.8 parts, etc.

[0044] The positive effects of controlling the weight of electrolytic manganese to be 0.4 to 1.0 parts: Electrolytic manganese mainly plays a role in deoxidation. For example, the weight of electrolytic manganese can be 0.4 parts, 0.6 parts, 0.8 parts, 0.9 parts, 1.0 parts, etc.

[0045] In some embodiments, the raw materials of the core are, by weight: natural rutile: 3.0 parts, 75# ferrosilicon powder: 1 part, sodium titanate: 0.2 parts, aluminum powder: 0.1 parts, fluoride: 0.2 parts, ferromanganese powder: 1 part, metallic chromium: 0.6 parts, copper powder: 0.20 parts, ferrochrome: 0.2 parts, quartz sand: 0.2 parts, antimony powder: 0.1 parts, iron powder: 0.8 parts, electrolytic manganese: 0.4 parts; or, natural rutile: 4.5 parts, 75# ferrosilicon powder: 2 parts, sodium titanate: 0.35 parts, aluminum powder: 0.2 parts, fluoride: 0.2 parts. 5 parts, ferromanganese powder: 2 parts, metallic chromium: 0.9 parts, copper powder: 0.5 parts, ferrochrome: 0.3 parts, quartz sand: 0.35 parts, antimony powder: 0.2 parts, iron powder: 1.3 parts, electrolytic manganese: 0.7 parts; or, natural rutile: 6.0 parts, 75# ferrosilicon powder: 3 parts, sodium titanate: 0.5 parts, aluminum powder: 0.3 parts, fluoride: 0.3 parts, ferromanganese powder: 3 parts, metallic chromium: 1.2 parts, copper powder: 0.80 parts, ferrochrome: 0.4 parts, quartz sand: 0.5 parts, antimony powder: 0.3 parts, iron powder: 1.8 parts, electrolytic manganese: 1.0 part.

[0046] This application provides a welding wire suitable for welding 09CrCuSb steel, the welding wire comprising a steel sheath and a flux core.

[0047] In some embodiments, the weight of the flux core is 10% to 20% of the weight of the welding wire.

[0048] The positive effects of controlling the weight of the flux core to be 10% to 20% of the weight of the welding wire are: a suitable filler ratio can ensure good slag coverage and good mechanical properties of the weld. For example, the weight of the flux core can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 18%, 19%, 20% of the weight of the welding wire, etc.

[0049] In some embodiments, the filling rate of the flux core is 10% to 20%; the wire diameter of the welding wire is 1.20 mm to 2.40 mm.

[0050] The positive effects of controlling the flux core filling rate to 10%–20% are: a suitable filling ratio can ensure good slag coverage and good mechanical properties of the weld. For example, the filling rate of the flux core can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 18%, 19%, 20%, etc.

[0051] For example, the wire diameter of the welding wire can be 1.20mm, 1.40mm, 1.60mm, 1.80mm, 2.0mm, 2.20mm, 2.40mm, etc.

[0052] In some embodiments, the chemical composition of the steel outer skin, by mass fraction, is: C: 0.01% to 0.04%, Mn: 0.10% to 0.40%, Si ≤ 0.04%, S ≤ 0.03%, P ≤ 0.03%, with the balance being iron powder and unavoidable impurities.

[0053] The positive effect of controlling the carbon content to 0.01% to 0.04% is that higher carbon content makes cracks more likely to occur. For example, the carbon content can be 0.01%, 0.02%, 0.03%, 0.035%, 0.04%, etc.

[0054] The positive effect of controlling the Mn content to 0.10% to 0.40% is to ensure the strength of the steel strip. For example, the Mn content can be 0.1%, 0.15%, 0.20%, 0.25%, 0.28%, 0.30%, 0.32%, 0.35%, 0.38%, 0.40%, etc.

[0055] The positive effect of controlling the Si content to ≤0.04% is to ensure the strength of the steel strip. For example, the Si content can be 0.01%, 0.02%, 0.03%, 0.035%, 0.04%, etc.

[0056] The positive effect of controlling the sulfur content to ≤0.030% is the reduction of impurity elements. For example, the sulfur content can be 0.005%, 0.006%, 0.008%, 0.009%, 0.010%, 0.011%, 0.012%, 0.016%, 0.019%, 0.023%, 0.025%, 0.028%, 0.030%, etc.

[0057] The positive effect of controlling the P content to ≤0.030% is the reduction of impurity elements. For example, the P content can be 0.005%, 0.006%, 0.008%, 0.009%, 0.010%, 0.011%, 0.012%, 0.015%, 0.016%, 0.019%, 0.023%, 0.025%, 0.028%, 0.030%, etc.

[0058] In some embodiments, the chemical composition of the steel outer skin, by mass fraction, is: C: 0.029%, Mn: 0.28%, Si: 0.02%, S: 0.008%, P: 0.011%, with the balance being iron and unavoidable impurities.

[0059] Figure 1This is a schematic flowchart illustrating a method for preparing welding wire for welding 09CrCuSb steel, as provided in an embodiment of this application.

[0060] Please see Figure 1 This application provides a method for preparing welding wire for welding 09CrCuSb steel, the method comprising:

[0061] S1. Mix the core material to obtain the core mixture;

[0062] S2. Using a wire forming device, the metal outer sheath is used to coat the flux-cored mixture;

[0063] S3. After being coated, it is rolled into wire and then drawn into welding wire.

[0064] This application provides a cladding metal suitable for welding 09CrCuSb steel, wherein the cladding metal is obtained by welding wire during the welding process.

[0065] In some embodiments, the chemical composition of the deposited metal, by mass fraction, includes: C ≤ 0.18%, Mn ≤ 2.0%, Si ≤ 0.90%, S ≤ 0.030%, P ≤ 0.030%, Cr: 0.7%–1.10%, Cu: 0.25%–0.45%, Sb: 0.04%–0.10%.

[0066] The positive effect of controlling the C content to ≤0.18% is reduced crack susceptibility. For example, the C content can be 0.05%, 0.06%, 0.07%, 0.09%, 0.10%, 0.12%, 0.13%, 0.15%, 0.18%, etc.

[0067] The positive effects of controlling the Mn content to ≤2.0% include: appropriate manganese content can improve weld strength, enhance deoxidation, and improve weld impact toughness. For example, the Mn content can be 0.25%, 0.50%, 0.75%, 1.00%, 1.25%, 1.50%, 1.75%, 2.00%, etc.

[0068] The positive effects of controlling the Si content to ≤0.90%: Too high a Si content is detrimental to impact toughness and can cause a decrease in low-temperature impact toughness. For example, the Si content can be 0.30%, 0.35%, 0.40%, 0.45%, 0.50%, 0.55%, 0.60%, 0.65%, 0.70%, 0.75%, 0.80%, 0.90%, etc.

[0069] The positive effects of controlling the sulfur content to ≤0.030% include: controlling impurity elements and preventing hot cracking. For example, the sulfur content can be 0.003%, 0.006%, 0.009%, 0.012%, 0.016%, 0.019%, 0.023%, 0.025%, 0.028%, 0.030%, etc.

[0070] The positive effects of controlling the P content to ≤0.030% include: controlling impurity elements and avoiding thermal cracking. For example, the P content can be 0.003%, 0.006%, 0.009%, 0.012%, 0.016%, 0.019%, 0.023%, 0.025%, 0.028%, 0.030%, etc.

[0071] The positive effect of controlling the Cr content to 0.7% to 1.10% is to improve the corrosion resistance of the weld. For example, the Cr content can be 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 1.0%, 1.05%, 1.10%, etc.

[0072] The positive effect of controlling the Cu content to 0.25% to 0.45% is to improve the corrosion resistance of the weld. For example, the Cu content can be 0.25%, 0.3%, 0.35%, 0.4%, 0.42%, 0.45%, etc.

[0073] The positive effects of controlling the Sb content to 0.04%–0.10% are as follows: Too low an antimony content will not provide corrosion resistance; too high an antimony content can easily cause cracks in the weld. For example, the Sb content can be 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, 0.10%, etc.

[0074] In some embodiments, the deposited metal satisfies at least one of the following properties: tensile strength R m The yield strength is 490MPa to 670MPa, and the yield strength R is... el ≥390MPa, elongation A≥18%, impact energy at -30℃ A KV2 ≥27J, diffusible hydrogen content <5mL / 100g.

[0075] The process of this application has good performance, and the resulting weld metal has excellent low-temperature impact toughness, good corrosion resistance, and low diffusible hydrogen content.

[0076] The present application is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the application. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to industry standards. If there is no corresponding industry standard, then common international standards, conventional conditions, or conditions recommended by the manufacturer are followed.

[0077] Example 1

[0078] This embodiment provides a welding wire for welding 09CrCuSb steel, which includes a steel sheath and a flux core. The steel sheath is made of steel strip (width × thickness) 14mm × 0.9mm, and its chemical composition by mass fraction is C: 0.029%, Mn: 0.28%, Si: 0.02%, S: 0.008%, P: 0.011%, with the balance being iron and unavoidable impurities. The flux core accounts for 15wt% of the total weight of the welding wire, and the raw materials of the flux core by weight are: natural rutile: 3.0 parts, 75# ferrosilicon powder: 1 part, sodium titanate: 0.2 parts, aluminum powder: 0.1 parts, fluoride: 0.2 parts, ferromanganese powder: 1 part, metallic chromium: 0.6 parts, copper powder: 0.20 parts, ferrochrome: 0.2 parts, quartz sand: 0.2 parts, antimony powder: 0.1 parts, iron powder: 0.8 parts, and electrolytic manganese: 0.4 parts.

[0079] Based on the aforementioned steel outer sheath and flux core, this embodiment also provides a method for preparing welding wire for 09CrCuSb steel welding, including the following steps:

[0080] The raw materials for the drug core are mixed to obtain the drug core mixture;

[0081] The steel strip is placed in the welding wire forming machine, and the flux core mixture to be used is injected into the groove of the steel strip which is laterally bent into a "U" shape. Then it is rolled into wire and finely drawn to obtain welding wire for 09CrCuSb steel with a wire diameter of 1.2mm.

[0082] Based on the above welding wire, this embodiment provides a welding wire for welding 09CrCuSb steel, and the cladding metal obtained during the welding process is provided. The welding parameters are: I = 230A~250A, U = 28V~30V, gas flow rate 20L / min, 100% CO2.

[0083] Example 2

[0084] The difference between this embodiment and Embodiment 1 is that the raw materials of the core are as follows (by weight): natural rutile: 4.5 parts, 75# ferrosilicon powder: 2 parts, sodium titanate: 0.35 parts, aluminum powder: 0.2 parts, fluoride: 0.25 parts, ferromanganese powder: 2 parts, metallic chromium: 0.9 parts, copper powder: 0.5 parts, ferrochrome: 0.3 parts, quartz sand: 0.35 parts, antimony powder: 0.2 parts, iron powder: 1.3 parts, and electrolytic manganese: 0.7 parts.

[0085] Example 3

[0086] The difference between this embodiment and Embodiment 1 is that the raw materials of the core are as follows (by weight): natural rutile: 6.0 parts, 75# ferrosilicon powder: 3 parts, sodium titanate: 0.5 parts, aluminum powder: 0.3 parts, fluoride: 0.3 parts, ferromanganese powder: 3 parts, metallic chromium: 1.2 parts, copper powder: 0.80 parts, ferrochrome: 0.4 parts, quartz sand: 0.5 parts, antimony powder: 0.3 parts, iron powder: 1.8 parts, and electrolytic manganese: 1.0 parts.

[0087] The chemical composition and properties of the cladding metals in Examples 1 to 3 were tested, and the test results are shown in Tables 1 and 2.

[0088] Table 1. Chemical composition (wt%) of the cladding metals in Examples 1-3

[0089]

[0090]

[0091] Table 2 shows the performance test results of the cladding metals in Examples 1-3.

[0092]

[0093] As shown in Tables 1 and 2, the welding wire in this embodiment effectively improves the overall performance of the weld during the welding process, solving the problems of insufficient low-temperature toughness and resistance to sulfuric acid dew point corrosion in the weld metal. Welded metal after welding: Tensile strength R m The yield strength is 490MPa to 670MPa, and the yield strength R is... el ≥390MPa, elongation A≥18%, impact energy at -30℃ A KV2 ≥27J, diffusible hydrogen content <5mL / 100g.

[0094] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A welding wire suitable for welding 09CrCuSb steel, characterized in that, The welding wire includes a steel sheath and a flux core; The raw materials of the drug core, by weight, include: Natural rutile: 3.0-6.0 parts, 75# ferrosilicon powder: 1-3 parts, sodium titanate: 0.2-0.5 parts, aluminum powder: 0.1-0.3 parts, fluoride: 0.2-0.3 parts, ferromanganese powder: 1-3 parts, metallic chromium: 0.6-1.2 parts, copper powder: 0.20-0.80 parts, ferrochrome: 0.2-0.4 parts, quartz sand: 0.2-0.5 parts, antimony powder: 0.1-0.3 parts, iron powder: 0.8-1.8 parts, electrolytic manganese: 0.4-1.0 parts; The chemical composition of the steel outer skin, expressed as a mass fraction, is as follows: C: 0.01%~0.04%, Mn: 0.10%~0.40%, Si≤0.04%, S≤0.03%, P≤0.03%, balance is iron and unavoidable impurities.

2. The welding wire according to claim 1, characterized in that, The raw materials for the drug core are, by weight: Natural rutile: 3.0 parts, 75# ferrosilicon powder: 1 part, sodium titanate: 0.2 parts, aluminum powder: 0.1 parts, fluoride: 0.2 parts, ferromanganese powder: 1 part, metallic chromium: 0.6 parts, copper powder: 0.20 parts, ferrochrome: 0.2 parts, quartz sand: 0.2 parts, antimony powder: 0.1 parts, iron powder: 0.8 parts, electrolytic manganese: 0.4 parts; or, Natural rutile: 4.5 parts, 75# ferrosilicon powder: 2 parts, sodium titanate: 0.35 parts, aluminum powder: 0.2 parts, fluoride: 0.25 parts, ferromanganese powder: 2 parts, metallic chromium: 0.9 parts, copper powder: 0.5 parts, ferrochrome: 0.3 parts, quartz sand: 0.35 parts, antimony powder: 0.2 parts, iron powder: 1.3 parts, electrolytic manganese: 0.7 parts; or, Natural rutile: 6.0 parts, 75# ferrosilicon powder: 3 parts, sodium titanate: 0.5 parts, aluminum powder: 0.3 parts, fluoride: 0.3 parts, ferromanganese powder: 3 parts, metallic chromium: 1.2 parts, copper powder: 0.80 parts, ferrochrome: 0.4 parts, quartz sand: 0.5 parts, antimony powder: 0.3 parts, iron powder: 1.8 parts, electrolytic manganese: 1.0 parts.

3. The welding wire according to claim 1, characterized in that, The weight of the flux core is 10% to 20% of the weight of the welding wire.

4. The welding wire according to claim 1, characterized in that, The diameter of the welding wire is 1.20mm to 2.40mm.

5. The welding wire according to claim 1, characterized in that, The chemical composition of the steel outer skin, expressed as a mass fraction, is as follows: C: 0.029%, Mn: 0.28%, Si: 0.02%, S: 0.008%, P: 0.011%, balance being iron and unavoidable impurities.

6. A weld metal suitable for welding 09CrCuSb steel, characterized in that, The deposited metal is obtained from the welding wire described in any one of claims 1 to 5 during the welding process.

7. The weld metal according to claim 6, characterized in that, The chemical composition of the deposited metal, expressed as a mass fraction, includes: C≤0.18%, Mn≤2.0%, Si≤0.90%, S≤0.030%, P≤0.030%, Cr: 0.7%~1.10%, Cu: 0.25%~0.45%, Sb: 0.04%~0.10%.

8. The weld metal according to claim 6, characterized in that, The deposited metal satisfies at least one of the following properties: tensile strength R m The yield strength is 490MPa~670MPa, and the yield strength R is... el ≥390MPa, elongation A≥18%, impact energy at -30℃ A KV2 ≥27J, diffusible hydrogen content <5mL / 100g.

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