CN110551951B - Ultralow-carbon high-temperature-resistant welding wire and preparation method thereof - Google Patents
Ultralow-carbon high-temperature-resistant welding wire and preparation method thereof Download PDFInfo
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
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- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
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Abstract
The invention relates to an ultra-low carbon high temperature resistant welding wire and a preparation method thereof, wherein the ultra-low carbon high temperature resistant welding wire comprises the following chemical components in percentage by mass: 0.01 to 0.04% of C, 22.0 to 24.0% of Cr, 1.5 to 3.5% of Si, 12.0 to 14.0% of Ni, 0.5 to 1.2% of Ti, 0.1 to 0.4% of Mn, 0.2 to 0.5% of Zr, 0.3 to 0.6% of Sc, 0.1 to 0.3% of Mo, 0.3 to 0.5% of Nb, 3.0 to 5.0% of Mg, 0.6 to 1.2% of Al, 0.03 to 0.07% of P, 0.02 to 0.05% of S, 0.2 to 0.4% of V, 1.3 to 1.6% of B, and the balance of Fe and other inevitable impurity elements. The invention can improve the mechanical property of the welding wire while ensuring the low carbon of the welding wire.
Description
Technical Field
The invention relates to the technical field of welding wires, in particular to an ultra-low-carbon high-temperature-resistant welding wire and a preparation method thereof.
Background
The wire is used as a filler metal or as a conductive wire welding material, and is used as a filler metal in gas welding and gas tungsten arc welding, and is used as a filler metal and a conductive electrode in submerged arc welding, electroslag welding, and other gas metal arc welding. Stainless steel has good corrosion resistance, durability, wear resistance and other properties, and is widely applied in various fields, stainless steel needs to be welded in order to meet large-size requirements in the industrial application process, and intergranular corrosion of stainless steel welding seams is a great problem in the chemical industry.
Stainless steels that produce intergranular corrosion, when stressed, break along grain boundaries and lose strength almost completely, which is one of the most dangerous forms of failure of stainless steels. At room temperature, carbon is inThe solubility of stainless steel is very low, about 0.02 to 0.03%, and the carbon content of stainless steel generally exceeds this value, so that the excess carbon continuously diffuses toward the grain boundaries of stainless steel and combines with chromium to form chromium compounds, such as (CrFe) between grains23C6And the like, which leads to decrease in the chromium content in the vicinity of the grain boundary and intergranular corrosion. The greater the carbon content, the more chromium compounds are likely to occur, thus reducing the carbon content in the weld bead, which can reduce and avoid the formation of chromium compounds, thereby reducing the tendency to form intergranular corrosion.
The carbon content in the welding wire is reduced, the carbon content in a welding seam can be effectively reduced, but the carbon content in the welding wire is reduced to influence the mechanical property of the welding wire, so that the problem to be solved at present is to improve the mechanical property of the welding wire while ensuring the low carbon of the welding wire.
Disclosure of Invention
The invention aims to provide an ultra-low-carbon high-temperature-resistant welding wire, which can improve the mechanical property of the welding wire while ensuring the low carbon of the welding wire; the invention also aims to provide a preparation method of the ultralow-carbon high-temperature-resistant welding wire.
The technical purpose of the invention is realized by the following technical scheme: an ultra-low carbon high temperature resistant welding wire comprises the following chemical components in percentage by mass: 0.01 to 0.04% of C, 22.0 to 24.0% of Cr, 1.5 to 3.5% of Si, 12.0 to 14.0% of Ni, 0.5 to 1.2% of Ti, 0.1 to 0.4% of Mn, 0.2 to 0.5% of Zr, 0.3 to 0.6% of Sc, 0.1 to 0.3% of Mo, 0.3 to 0.5% of Nb, 3.0 to 5.0% of Mg, 0.6 to 1.2% of Al, 0.03 to 0.07% of P, 0.02 to 0.05% of S, 0.2 to 0.4% of V, 1.3 to 1.6% of B, and the balance of Fe and other inevitable impurity elements.
By adopting the technical scheme, the ultra-low carbon content can reduce and avoid chromium compounds formed at the welding seam, thereby reducing the intergranular corrosion of the stainless steel, improving the strength of the stainless steel and prolonging the service life of the stainless steel. The addition of Si can lower the melting point of the alloy and reduce the linear expansion coefficient, so that the alloy is not easy to generate crystal cracks and has good weldability and castability after being melted. Si as a deoxidizing element prevents iron from being combined with oxygen, andFeO can be reduced in a furnace. Ti, Zr, Sc, V and B are beneficial to improving the performance of the welding seam, refining crystal grains of crack metal, reducing the tendency of generating welding cracks during welding and improving the ductility and toughness of the welding seam. The addition of a small amount of Ti can ensure that the alloy steel can precipitate primary TiAl from a melt in the solidification process3The phase is very close to an alpha (Al) matrix in lattice structure and size, is a good substrate on which Al atoms are stacked, and can provide a core for heterogeneous nucleation of the alpha (Al) matrix, so that the grain structure of a welding seam is refined. Adding Sc and primary Al3Fine grain strengthening of Sc particles and secondary Al3The dispersion precipitation strengthening of Sc particles and the substructure strengthening generated by inhibiting recrystallization, thereby improving the strength of the alloy. Sc is high in cost, and in order to reduce the content of Sc, Zr is added to form dispersed Al3Zr particles, wherein the Zr and the Sc generate strong strengthening effects such as fine grain strengthening, substructure strengthening, dispersion strengthening, coherent strengthening and the like on the alloy.
Mn plays roles of microalloying and strengthening and toughening, and can also improve the stress corrosion resistance of alloy steel, and the addition of Mn can ensure that Mg phase is uniformly precipitated, so that the corrosion sensitivity of the alloy steel is reduced, particularly the stress corrosion cracking resistance is obviously improved, and the mechanical property of a welding line is improved. Mo in the alloy steel can improve the strength and hardness of the steel, refine crystal grains, prevent the tempering brittleness and overheating tendency, improve the plasticity of the alloy steel, reduce the tendency of generating cracks and improve the impact toughness.
After Mg is added, Mg and Si atoms are gathered on crystal faces of a matrix to form a solute atom enrichment area, the Mg and Si atoms are further enriched and tend to be ordered along with the increase of aging temperature and the extension of time, the Mg and Si atoms rapidly grow into a needle shape or a rod shape, and the Mg and Si can form beta (Mg and Si can form beta)2Si) strengthening phase, the tensile strength of the welding wire is improved, and meanwhile, the surface of the prepared welding wire can be smooth and clean by adding Mg. The deformation resistance of the alloy in the welding wire preparation process is increased along with the increase of the Mg content, the Mg content is high, and the forming processing of the welding wire is not facilitated, so that the Mg content is 3.0-5.0%.
The invention is further provided with: the chemical components of the ultra-low carbon high temperature resistant welding wire are as follows by mass percent: 0.02% of C, 23.5% of Cr, 2.5% of Si, 13.2% of Ni, 0.8% of Ti, 0.28% of Mn, 0.35% of Zr, 0.45% of Sc, 0.22% of Mo, 0.41% of Nb, 4.3% of Mg, 0.9% of Al, 0.05% of P, 0.04% of S, 0.33% of V, 1.45% of B, and the balance of Fe and other unavoidable impurity elements.
The invention is further provided with: the chemical components of the ultra-low carbon high temperature resistant welding wire are as follows by mass percent: 0.03% of C, 22.8% of Cr, 2.8% of Si, 13.6% of Ni, 0.6% of Ti, 0.35% of Mn, 0.41% of Zr, 0.52% of Sc, 0.22% of Mo, 0.41% of Nb, 4.3% of Mg, 0.9% of Al, 0.05% of P, 0.04% of S, 0.33% of V, 1.45% of B, and the balance of Fe and other unavoidable impurity elements.
The second technical purpose of the invention is realized by the following technical scheme: a preparation method of an ultra-low carbon high temperature resistant welding wire specifically comprises the following steps:
step 1, ingredient smelting: weighing the components according to the proportion, and then adding the components into a heating furnace for smelting;
step 2, refining: after all the components in the heating furnace are completely melted, adding a refining agent, and uniformly stirring, wherein the refining agent accounts for 0.3-0.5% of the total mass of the alloy liquid;
step 3, casting: and (3) standing for 10-30 min after refining, removing molten slag on the surface of the alloy liquid, and casting into ingots:
step 4, preparing a wire blank: heating the cast ingot, and performing hot extrusion to obtain a line blank;
step 5, drawing: drawing the wire blank prepared in the step 4 through a wire drawing machine, then performing intermediate annealing, and continuing to draw the wire blank to a certain specification;
step 6, welding wire surface treatment: and carrying out acid washing, polishing and passivation treatment on the surface of the welding wire to obtain the finished welding wire.
By adopting the technical scheme, the molten alloy is refined after the raw materials are melted, and the refining aims to remove impurities in the alloy, eliminate or reduce oxide inclusions and gas as much as possible and improve the purification degree of metal. The refined alloy liquid is cast and drawn to form a welding wire with a certain specification, the wire blank is subjected to work hardening in the drawing process to cause plasticity reduction, and the phenomenon that the wire blank is broken easily occurs, so that intermediate annealing is needed in the drawing process to recover the plasticity of the wire blank, the dislocation density in the wire blank is reduced in the annealing process, the residual stress is partially released, and the wire blank is softened, so that the drawing can be continuously carried out, and the possibility of breaking the wire blank is reduced. The surface of the drawn welding wire has greasy dirt impurities such as lubricating oil and the like, a layer of black ash is easily formed on the surface of stainless steel in the welding process, and the purpose of acid washing is to remove the greasy dirt on the surface of the welding wire. The polishing can reduce the roughness of the surface of the welding wire, a uniform and compact passive film is formed on the surface of the welding wire, the corrosion resistance of the welding wire is improved, and in addition, the polished welding wire can enable the welding wire to be stable in a wire feeding process, so that the stability of the welding process is ensured.
The invention is further provided with: the smelting temperature in the step 1 is 1850-1950 ℃.
By adopting the technical scheme, the temperature of 1850-1950 ℃ can ensure that all the added components can be melted to form uniform alloy liquid.
The invention is further provided with: the refining temperature in the step 2 is 1600-1700 ℃.
By adopting the technical scheme, the refining effect is good at 1600-1700 ℃.
The invention is further provided with: the acid washing solution in the step 6 is a sulfuric acid solution with the mass fraction of 15-20%, the acid washing temperature is 30-50 ℃, and the acid washing time is 2-5 min.
Through adopting above-mentioned technical scheme, the pickling temperature is high is favorable to improving the pickling effect, but too high pickling temperature leads to acid mist to form easily, influences operating environment, brings certain harm for operating personnel's health.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the ultra-low carbon content can reduce and avoid chromium compounds formed at the welding seam, thereby reducing the intergranular corrosion of the stainless steel, improving the strength of the stainless steel and prolonging the service life of the stainless steel. The addition of Si can lower the melting point of the alloy and reduce the linear expansion coefficient, so that the alloy is not easy to generate crystal cracks and has good weldability and castability after being melted. Si is a deoxidizing element, and can prevent iron from being combined with oxygen, and FeO can be reduced in a heating furnace. Ti, Zr, Sc, V and B are beneficial to improving the performance of the welding seam, refining crystal grains of crack metal, reducing the tendency of generating welding cracks during welding and improving the ductility and toughness of the welding seam. The addition of a small amount of Ti can ensure that the alloy steel can precipitate a primary TiAl3 phase from a melt in the solidification process, the particles are very close to an alpha (Al) matrix in the lattice structure and size, are good substrates on which Al atoms are accumulated, and can provide cores for the heterogeneous nucleation of the alpha (Al) matrix, thereby refining the weld grain structure.
Mn plays roles of microalloying and strengthening and toughening, and can also improve the stress corrosion resistance of the alloy steel, and the addition of Mn can ensure that Mg phase is uniformly precipitated, so that the corrosion sensitivity of the alloy steel is reduced, and particularly, the stress corrosion cracking resistance is obviously improved, thereby improving the mechanical property of a welding line. Mo in the alloy steel can improve the strength and hardness of the steel, refine crystal grains, prevent temper brittleness and overheating tendency, improve the plasticity of the alloy steel, reduce the tendency of generating cracks and improve impact toughness;
3. adding Sc and primary Al3Fine grain strengthening of Sc particles and secondary Al3The dispersion precipitation strengthening of Sc particles and the substructure strengthening generated by inhibiting recrystallization, thereby improving the strength of the alloy. Sc is high in cost, and in order to reduce the content of Sc, Zr is added to form dispersed Al3Zr particles, wherein Zr and Sc in the alloy generate strong strengthening effects such as fine grain strengthening, substructure strengthening, dispersion strengthening, coherent strengthening and the like on the alloy;
4. after Mg is added, Mg and Si atoms are gathered on crystal faces of a matrix to form a solute atom enrichment area, the Mg and Si atoms are further enriched and tend to be ordered along with the increase of aging temperature and the extension of time, the Mg and Si atoms rapidly grow into a needle shape or a rod shape, and the Mg and Si can form beta (Mg and Si can form beta)2Si) strengthening phase, the tensile strength of the welding wire is improved, and meanwhile, the surface of the prepared welding wire can be smooth and clean by adding Mg. Welding wire preparation processThe deformation resistance of the gold is increased along with the increase of the content of Mg, the content of Mg is high, and the forming processing of the welding wire is not facilitated, so that the content of Mg is 3.0-5.0%.
Drawings
FIG. 1 is a flow chart of the preparation method of the ultra-low carbon high temperature resistant welding wire of the invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The chemical components of the ultra-low carbon high temperature resistant welding wire are as follows by mass percent: 0.02% of C, 23.5% of Cr, 2.5% of Si, 13.2% of Ni, 0.8% of Ti, 0.28% of Mn, 0.35% of Zr, 0.45% of Sc, 0.22% of Mo, 0.41% of Nb, 4.3% of Mg, 0.9% of Al, 0.05% of P, 0.04% of S, 0.33% of V, 1.45% of B, and the balance of Fe and other unavoidable impurity elements.
The preparation method of the ultra-low carbon high temperature resistant welding wire specifically comprises the following steps:
step 1, ingredient smelting: weighing the components according to the proportion, and then adding the components into a heating furnace for smelting at 1850 ℃;
step 2, refining: after all the components in the heating furnace are completely melted, adding a refining agent, and uniformly stirring, wherein the refining agent accounts for 0.3 percent of the total mass of the alloy liquid, and the refining temperature is 1600 ℃;
step 3, casting: and (3) standing for 10min after refining, removing molten slag on the surface of the alloy liquid, and casting into ingots:
step 4, preparing a wire blank: heating the cast ingot, and performing hot extrusion to obtain a line blank;
step 5, drawing: stretching the wire blank prepared in the step 4 through a wire drawing machine, then performing intermediate annealing, and continuously stretching the wire blank until the diameter is 2-3 mm;
step 6, welding wire surface treatment: and carrying out acid washing, polishing and passivation treatment on the surface of the welding wire to obtain a finished welding wire, wherein the acid washing solution is a sulfuric acid solution with the mass fraction of 15%, the acid washing temperature is 30 ℃, and the acid washing time is 5 min.
Example 2
The chemical components of the ultra-low carbon high temperature resistant welding wire are as follows by mass percent: 0.03% of C, 22.8% of Cr, 2.8% of Si, 13.6% of Ni, 0.6% of Ti, 0.35% of Mn, 0.41% of Zr, 0.52% of Sc, 0.22% of Mo, 0.41% of Nb, 4.3% of Mg, 0.9% of Al, 0.05% of P, 0.04% of S, 0.33% of V, 1.45% of B, and the balance of Fe and other unavoidable impurity elements.
The preparation method of the ultra-low carbon high temperature resistant welding wire specifically comprises the following steps:
step 1, ingredient smelting: weighing the components according to the proportion, and then adding the components into a heating furnace for smelting;
step 2, refining: after all the components in the heating furnace are completely melted, adding a refining agent, and uniformly stirring, wherein the refining agent accounts for 0.4% of the total mass of the alloy liquid;
step 3, casting: and (3) standing for 30min after refining, removing molten slag on the surface of the alloy liquid, and casting into ingots:
step 4, preparing a wire blank: heating the cast ingot, and performing hot extrusion to obtain a line blank;
step 5, drawing: stretching the wire blank prepared in the step 4 through a wire drawing machine, then performing intermediate annealing, and continuously stretching the wire blank to the diameter of 2-3 mm;
step 6, welding wire surface treatment: and carrying out acid washing, polishing and passivation treatment on the surface of the welding wire to obtain a finished welding wire, wherein the acid washing solution is a sulfuric acid solution with the mass fraction of 15%, the acid washing temperature is 40 ℃, and the acid washing time is 3 min.
Example 3
The chemical components of the ultra-low carbon high temperature resistant welding wire are as follows by mass percent: 0.01% of C, 22.0% of Cr, 3.5% of Si, 12.0% of Ni, 1.2% of Ti, 0.1% of Mn, 0.5% of Zr, 0.6% of Sc, 0.1% of Mo, 0.5% of Nb, 3.0% of Mg, 1.2% of Al, 0.07% of P, 0.05% of S, 0.4% of V, 1.6% of B, and the balance of Fe and other unavoidable impurity elements.
The preparation method of the ultra-low carbon high temperature resistant welding wire specifically comprises the following steps:
step 1, ingredient smelting: weighing the components according to the proportion, and then adding the components into a heating furnace for smelting;
step 2, refining: after all the components in the heating furnace are completely melted, adding a refining agent, and uniformly stirring, wherein the refining agent accounts for 0.5 percent of the total mass of the alloy liquid;
step 3, casting: and (3) standing for 20min after refining, removing molten slag on the surface of the alloy liquid, and casting into ingots:
step 4, preparing a wire blank: heating the cast ingot, and performing hot extrusion to obtain a line blank;
step 5, drawing: stretching the wire blank prepared in the step 4 through a wire drawing machine, then performing intermediate annealing, and continuously stretching the wire blank until the diameter is 2-3 mm;
step 6, welding wire surface treatment: and carrying out acid washing, polishing and passivation treatment on the surface of the welding wire to obtain a finished welding wire, wherein the acid washing solution is a sulfuric acid solution with the mass fraction of 20%, the acid washing temperature is 50 ℃, and the acid washing time is 2 min.
Example 4
The chemical components of the ultra-low carbon high temperature resistant welding wire are as follows by mass percent: 0.04% of C, 24.0% of Cr, 1.5% of Si, 14.0% of Ni, 0.5% of Ti, 0.4% of Mn, 0.2% of Zr, 0.3% of Sc, 0.3% of Mo, 0.3% of Nb, 5.0% of Mg, 0.6% of Al, 0.03% of P, 0.02% of S, 0.2% of V, 1.3% of B, and the balance of Fe and other unavoidable impurity elements.
The preparation method of the ultra-low carbon high temperature resistant welding wire is the same as that of the embodiment 2.
Comparative example 1
An ultra-low carbon high temperature resistant wire, which is different from example 2 in that C is 0.05%, and the other is the same as example 2.
The preparation method of the ultra-low carbon high temperature resistant welding wire is the same as that of the embodiment 2.
Comparative example 2
An ultra-low carbon high temperature resistant welding wire, which is different from the welding wire of example 2 in that Ti is not included, is the same as the welding wire of example 2.
The preparation method of the ultra-low carbon high temperature resistant welding wire is the same as that of the embodiment 2.
Comparative example 3
An ultra-low carbon high temperature resistant wire which is different from the wire of example 2 in that Sc is not included, and the other part is the same as that of example 2.
The preparation method of the ultra-low carbon high temperature resistant welding wire is the same as that of the embodiment 2.
Comparative example 4
An ultra-low carbon high temperature resistant welding wire is different from the welding wire of the embodiment 2 in that Zr is not included, and the other welding wire is the same as the welding wire of the embodiment 2.
The preparation method of the ultra-low carbon high temperature resistant welding wire is the same as that of the embodiment 2.
Comparative example 5
An ultra-low carbon high temperature resistant wire, which is different from example 2 in that Ti, Sc, Zr, V and B are not included, and the other is the same as example 2.
The preparation method of the ultra-low carbon high temperature resistant welding wire is the same as that of the embodiment 2.
The ultra-low carbon high temperature resistant welding wires prepared in the examples 1 to 4 and the comparative examples 1 to 5 are subjected to tensile property test: and (3) carrying out a tensile test on the welding wire by using GB/T228-2002 metal material room temperature tensile test method.
TABLE 1 test results of tensile properties of solder wires
The ultra-low carbon high temperature resistant welding wires prepared in the examples 1 to 4 have better tensile properties than those of the welding wires prepared in the comparative examples.
Welding experiment: selecting stainless steel plates with the same size and specification, removing oil stains on the surface of the stainless steel within 50mm of a welding line, cleaning the stainless steel with a metal brush until the surface of the stainless steel is brushed to expose metal luster, keeping the surface of the stainless steel clean and welding as soon as possible, and then performing a room temperature tensile test on a welding joint.
TABLE 2 weld joint tensile Property test results
In the welding experiments of the ultra-low carbon high temperature resistant welding wires prepared in the examples 1 to 4, the tensile property of the welding joint is superior to that of the welding wire prepared in the comparative example.
The present embodiment is only for explaining the present invention, and not for limiting the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as needed after reading the present specification, but all of which are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. An ultra-low carbon high temperature resistant welding wire is characterized in that: the chemical components of the ultra-low carbon high temperature resistant welding wire are as follows by mass percent: 0.01 to 0.04% of C, 22.0 to 24.0% of Cr, 1.5 to 3.5% of Si, 12.0 to 14.0% of Ni, 0.5 to 1.2% of Ti, 0.1 to 0.4% of Mn, 0.2 to 0.5% of Zr, 0.3 to 0.6% of Sc, 0.1 to 0.3% of Mo, 0.3 to 0.5% of Nb, 3.0 to 5.0% of Mg, 0.6 to 1.2% of Al, 0.03 to 0.07% of P, 0.02 to 0.05% of S, 0.2 to 0.4% of V, 1.3 to 1.6% of B, and the balance of Fe and other inevitable impurity elements.
2. The ultra-low carbon high temperature resistant welding wire of claim 1, wherein: the chemical components of the ultra-low carbon high temperature resistant welding wire are as follows by mass percent: 0.02% of C, 23.5% of Cr, 2.5% of Si, 13.2% of Ni, 0.8% of Ti, 0.28% of Mn, 0.35% of Zr, 0.45% of Sc, 0.22% of Mo, 0.41% of Nb, 4.3% of Mg, 0.9% of Al, 0.05% of P, 0.04% of S, 0.33% of V, 1.45% of B, and the balance of Fe and other unavoidable impurity elements.
3. The ultra-low carbon high temperature resistant welding wire of claim 1, wherein: the chemical components of the ultra-low carbon high temperature resistant welding wire are as follows by mass percent: 0.03% of C, 22.8% of Cr, 2.8% of Si, 13.6% of Ni, 0.6% of Ti, 0.35% of Mn, 0.41% of Zr, 0.52% of Sc, 0.22% of Mo, 0.41% of Nb, 4.3% of Mg, 0.9% of Al, 0.05% of P, 0.04% of S, 0.33% of V, 1.45% of B, and the balance of Fe and other unavoidable impurity elements.
4. The method for preparing the ultra-low carbon high temperature resistant welding wire according to claim 1, wherein the method comprises the following steps: the method specifically comprises the following steps:
step 1, ingredient smelting: weighing the components according to the proportion, and then adding the components into a heating furnace for smelting;
step 2, refining: after all the components in the heating furnace are completely melted, adding a refining agent, and uniformly stirring, wherein the refining agent accounts for 0.3-0.5% of the total mass of the alloy liquid;
step 3, casting: and (3) standing for 10-30 min after refining, removing molten slag on the surface of the alloy liquid, and casting into ingots:
step 4, preparing a wire blank: heating the cast ingot, and performing hot extrusion to obtain a line blank;
step 5, drawing: drawing the wire blank prepared in the step 4 through a wire drawing machine, then performing intermediate annealing, and continuing to draw the wire blank to a certain specification;
step 6, welding wire surface treatment: and carrying out acid washing, polishing and passivation treatment on the surface of the welding wire to obtain the finished welding wire.
5. The method for preparing the ultra-low carbon high temperature resistant welding wire according to claim 4, wherein: the smelting temperature in the step 1 is 1850-1950 ℃.
6. The method for preparing the ultra-low carbon high temperature resistant welding wire according to claim 4, wherein: the refining temperature in the step 2 is 1600-1700 ℃.
7. The method for preparing the ultra-low carbon high temperature resistant welding wire according to claim 4, wherein: the acid washing solution in the step 6 is a sulfuric acid solution with the mass fraction of 15-20%, the acid washing temperature is 30-50 ℃, and the acid washing time is 2-5 min.
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| JP4946242B2 (en) * | 2006-07-27 | 2012-06-06 | 住友金属工業株式会社 | Austenitic stainless steel welded joint and austenitic stainless steel welded material |
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