Gas metal arc welding flux-cored wire used for ultralow-temperature high-manganese steel

Abstract

The invention relates to a gas metal arc welding flux-cored wire used for ultralow-temperature high-manganese steel. According to the technical scheme, the gas metal arc welding flux-cored wire used for the ultralow-temperature high-manganese steel is composed of 65-70 wt% of a steel strip and 30-35 wt% of flux core powder; the steel strip comprises the following chemical components: 0.10-0.20 wt% of C, 0.01-0.05 wt% of Si, 3-7 wt% of Mn, less than or equal to 0.002 wt% of P, less than or equal to 0.001 wt% of S, and the balance Fe and inevitable impurities; and the flux core powder comprises the following chemical components: 28-34 wt% of rutile, 2-4 wt% of zircon sand, 2-4 wt% of potassium titanate, 20-25 wt% of electrolytic manganese, 8-15 wt% of nickel powder, 8-12 wt% of high-carbon ferro-chrome, and the balance iron powder. According to the gas metal arc welding flux-cored wire used for the ultralow-temperature high-manganese steel, all-position welding can be achieved, and the welding efficiency is high; and formed weld metal is good in forming, low in pore sensitivity and excellent in low-temperature toughness, and the strength matches that of the ultralow-temperature high-manganese steel.

Description

technical field [0001] The invention belongs to the technical field of gas-shielded flux-cored welding wire. In particular, it relates to a flux-cored welding wire used for ultra-low temperature high manganese steel. Background technique [0002] The steel used for storage and transportation containers such as liquefied natural gas (LNG) is usually stored at -196°C at ultra-low temperature. The steel for commercial LNG storage tanks at this stage is 9Ni steel. Because the steel plate with 9% nickel content is expensive, it is the key to LNG storage and transportation. While the material steel requires high safety, reducing construction costs and realizing the development of Ni-reduced steel plates has become an important development direction of low-temperature steels. For this reason, nickel-saving low-temperature steels have been developed successively at home and abroad. In recent years, in order to reduce the production cost of steel for LNG storage tanks and the depend...

AI Technical Summary

Problems solved by technology

in pure CO 2 or rich CO 2 Under the shielding gas, the pore sensitivity of the weld metal is relatively hig