Solder wire material for stainless steel

Abstract

The invention discloses a welding wire material for stainless steels and the weight percentage of the concrete chemical compositions of the welding wire material is as follows: C, 0.07 to 0.09; Si, 0.65 to 0.95; Mn, 6.7 to 7.2; P, less than or equal to 0.02; S, less than or equal to 0.015; Cr, 18.5 to 19.5; Ni, 8.0 to 9.5; Mo, less than or equal to 0.4; the remaining is Fe and inevitable impurities. The welding wire material is used for 304 austenitic stainless steels, and welding seams are smooth after the welding is performed and metals at the welding seams have the similar performance as mother metal, no black skin exists and the cost is low.

Description

technical field [0001] The invention belongs to the material field of welding wire for metal material welding. In particular, it relates to welding wire materials for welding 304 austenitic stainless steel. Background technique [0002] Stainless steel is an alloy steel that adds chromium to steel to significantly improve corrosion resistance. According to its composition, it can be roughly divided into chromium series and chromium-nickel series. According to the metal structure, it can be divided into martensite, ferrite, austenite, There are 5 types of austenite-ferrite and precipitation hardening. Austenitic stainless steel (hereinafter referred to as "stainless steel") is a chromium-nickel system in terms of composition, and various steels developed by improving it. In the welding process of 304 austenitic stainless steel, in order to obtain the result of matching the strength of the weld metal with the strength of the base metal, it is necessary to add the necessary a...

AI Technical Summary

Problems solved by technology

However, due to the use of traditional welding wire materials such as ER308 after welding, the weld seam is not smooth, and there is a serious problem of difficult slag removal in the welding process, commonly known as "black skin", and the cost is high

Therefore, when traditional welding wire is used for welding, it is difficult to obtain the result of matching the properties of the weld metal and the base metal. It is still difficult to have welding wire materials that meet this requirement in the welding materials of the prior art, and are widely used in the industry. Stainless steel generally has the disadvantage of poor weldability