Ultralow-carbon austenitic welding wire material for welding of stainless steel

Abstract

The invention provides an ultralow-carbon austenitic welding wire material for the welding of stainless steel. According to percentage in weight, the specific chemical components of the welding wire material are as follows: less than or equal to 0.023 percent of C; 3.87 to 4.45 percent of Si; 0.57 to 0.89 percent of Mn; less than or equal to 0.023 percent of P; less than or equal to 0.013 percent of S; 18.59 to 19.32 percent of Cr; 13.57 to 14.87 percent of Ni; less than or equal to 0.33 percent of Mo; less than 0.044 percent of N; 0.09 to 0.29 percent of Cu; and the balance of Fe and inevitable impurities; and the welding wire material also comprises 0.02 to 0.042 percent by weight of rare-earth element Re. The welding wire material has the beneficial effects that: the component design is scientific, the welding wire material is convenient to use, the cold-cracking sensitivity of metal at the weld is low after welding, the performance result of the metal at the weld is near to the performance result of parent metal, and moreover, the welding wire material has high low-temperature impact toughness and corrosion resistance; and in particular, the ultralow-carbon austenitic welding wire material for the welding of stainless steel can resist the corrosion of concentrated nitric acid.

Description

technical field [0001] The invention relates to a welding wire material for metal material welding, in particular to an ultra-low carbon austenitic welding wire material for stainless steel welding. Background technique [0002] Stainless steel is an alloy steel in which chromium is added to steel to significantly improve corrosion resistance. According to its composition, it can be roughly divided into chromium series and chromium-nickel series, and can be divided into martensite, ferrite, and austenite according to metal structure. , 5 kinds of austenite-ferrite and precipitation hardening system. [0003] Austenitic stainless steels belong to the chromium-nickel series in terms of composition, and various steels have been improved and developed accordingly. In the welding process of low-alloy high-strength and ultra-fine grain steel, in order to obtain the result that the metal strength of the weld matches the strength of the base metal, it is necessary to add necessar...

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Problems solved by technology

Moreover, the expression formulas of various carbon contents also show that the effects of other elements on promoting cold crack susceptibility are very low compared with carbon elements. Matching results, especially when welding does not require preheating, and the metal strength of the weld is high, and at the same time has high low temperature impact toughness, corrosion resistance, especially the welding wire material resistant to concentrated nitric acid corrosion, but currently in the existing technology Among the welding materials, it is difficult to meet the requirements of the welding wire material