High-tenacity gas shielded welding wire for welding low-temperature steel and using method thereof

Abstract

The invention provides a high-tenacity gas shielded welding wire for welding low-temperature steel, which is suitable for welding the low-temperature steel subjected to service in the environment of over minus 60 DEG C. The gas shielded welding wire comprises the following chemical components in percentage by mass: 0.04 to 0.10 percent of C, 0.20 to 0.60 percent of Si, 1.20 to 1.60 percent of Mn, 1.5 to 2.0 percent of Ni, 0.10 to 0.30 percent of Mo, 0.02 to 0.10 percent of Ti, 0.02 to 0.08 percent of Zr, less than or equal to 0.010 percent of S, less than or equal to 0.010 percent of P, less than or equal to 0.0025 percent of O, less than or equal to 0.0070 percent of N, and the balance of Fe and inevitable impurities. The welding wire welds by adopting Ar + 20%CO2 full-argon gas shielding so a weld metal has high low-temperature tenacity in a welding state and under a heat treatment condition after welding.

Description

technical field [0001] The invention belongs to the field of welding materials, and specifically relates to a high-toughness gas-shielded welding wire with high Ni content and Ti and Zr microalloying and a use method thereof. Background technique [0002] With the increasing application of welded structures in low-temperature environments, such as low-temperature pressure vessels, gas pipelines, petrochemical equipment, refrigeration equipment, food industry and liquid gas storage equipment, etc., all need to be used in low-temperature environments. Therefore, it is the primary consideration to require such steels to have sufficient low-temperature toughness and high resistance to low-temperature embrittlement. This will put forward higher requirements on the low temperature toughness of welded joints, and then on welding materials and welding processes. However, in the existing technology, there are very few gas-shielded welding wires that can meet the requirements of equi...

AI Technical Summary

Problems solved by technology

One type of welding wire cannot meet the low temperature toughness requirements of the weld metal at -60°C due to its high S and P content and low Ni content; the other type of welding wire belongs to su...

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