A solid welding wire for gas shielded welding of high manganese and low temperature steel

Abstract

The invention discloses a solid core wire for gas protection welding of high manganese low temperature steel. The solid core wire is characterized by comprising the following chemical composition in percentage by mass: 0.2-0.4% of C, 12-15% of Mn, 14-18% of Ni, 1.5-4.5% of Cr, 0.1-0.6% of Mo, 0.005-0.040% of Ti, no more than 0.004% of P, no more than 0.002% of S and the balance Fe and inevitable impurity elements. The solid core wire adopts the alloy design of composite manganese and nickel adding, the content of expensive elements such as nickel and the cost of alloy are reduced, the fact that the excessive amount of manganese forms excessive toxic manganese evaporation in the welding process is avoided, the use performance of the wire is improved, the weld metal formed by the solid corewire at low temperature of minus 196 DEG C has excellent impact toughness, and the welding requirements of the high manganese low temperature steel for the construction of liquefied natural gas storage tanks and other equipment are well met.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a solid core welding wire used for gas shielded welding of high manganese and low temperature steel. Background technique [0002] The storage and transportation of liquefied natural gas (boiling point -162°C), liquid oxygen (boiling point -183°C) and liquid nitrogen (boiling point -196°C) require structural materials that serve under low temperature conditions. The main mechanical property requirements are low temperature Has sufficient impact toughness. As commonly used low-temperature steel, materials such as 9%Ni steel and Cr-Ni austenitic stainless steel need to add a large amount of expensive nickel element, so the cost is very high. In recent years, high-manganese low-temperature steel has received widespread attention as a cutting-edge new low-temperature material, and the development of its special matching welding consumables is also extremely imp...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the deficiencies in the prior art, comprehensively consider the high cost of Ni and the volatile problems of high-content Mo, and provide a low-cost, easy-to-use solid core wire for gas shielded welding of high-manganese low-temperature steel. The composition design of the welding wire makes the weld metal formed by the welding wire have excellent low-temperature impact toughness, which meets the welding requirements of high-manganese steel and low-temperature steel used in the construction of liquefied natural gas storage tanks and other equipment