MIG welding solid-core welding wire for high-manganese austenite low-temperature steel and welding process of MIG welding solid-core welding wire

Abstract

The invention relates to an MIG welding solid-core welding wire for high-manganese austenite low-temperature steel and a welding process of the MIG welding solid-core welding wire. According to the technical scheme, the MIG welding solid-core welding wire for the high-manganese austenite low-temperature steel comprises the following chemical components: 0.20-0.60 wt% of C; si is less than or equal to 0.05 wt%; the content of Mn is 20-32 wt%; the content of Ni is 0.1 to 2 weight percent; the content of Cr is 0.1 to 1.8 wt%; the content of Cu is 0.55 to 1.00 wt%; the content of W is 0.5 to 1.9 weight percent; the content of Mo is 1.3 to 3.0 wt%; the content of Al is 0.5 to 2 weight percent; nb + V + Ti + B + RE < = 0.5 wt%; p < = 0.002 wt%; s < = 0.001 wt%; and the balance of Fe and inevitable impurities. Full-automatic and all-position welding can be achieved, the welding efficiency is high, forming is good, and the mechanical property is excellent; the strength of weld metal formed through inert gas protection is matched with that of high-manganese austenite low-temperature steel, the forming performance is good, the low-temperature toughness is excellent, and the technical requirements for the strength and ultralow-temperature toughness of the LNG storage tank at the working temperature of-196 DEG C can be met.

Description

technical field [0001] The invention belongs to the technical field of solid core welding wire for molten inert gas shielded welding (abbreviated as MIG welding, the same below). It specifically relates to a MIG welding solid wire for high manganese austenitic low temperature steel and a welding process thereof. Background technique [0002] In recent years, with the rapid development of liquefied natural gas (abbreviated as LNG, the same below) clean energy, LNG storage and transportation equipment (its service temperature is -196°C) has shown unprecedented huge demand. At present, the steel used for commercial LNG storage tanks is 9Ni steel, which is expensive. Therefore, the development and development of new low-temperature steel has become an important direction for all countries in the world. The high-manganese steel with a manganese content of 22-25% has the same physical metallurgical characteristics as nickel, and the stacking fault energy of the steel can be contr...

AI Technical Summary

Problems solved by technology

"HIGH STRENGTH WELDING JOINT HAVING EXCELLENT IMPACT TOUGHNESS AT VERY LOW TEMPERATURE,AND FLUX-CORED ARC WELDINGWIRE THEREFOR" (US201816189232) U.S. patented technology and "A metal powder cored wire for ultra-low temperature high manganese steel gas metal arc welding" (CN201910008171 .1) Patented technology, which discloses CO used for high manganese low temperature steel 2 or CO 2 Flux-cored welding wire and solid-cored welding wire protected by +Ar mixed gas can achieve high-efficiency welding in all positions, but there are problems such as large smoke and dust, large spatter, poor forming and low mechanical properties of weld metal

[0007] At present, there is no report on the melting inert gas shielded welding (MIG) welding wire and its welding technology for high manganese austenitic low temperature steel