High-nitrogen manual arc welding electrode suitable for high-nitrogen armor steel welding

Abstract

The invention relates to a high-nitrogen manual arc welding electrode (hereinafter referred to as welding electrode) suitable for high-nitrogen armor steel welding. According to the technical scheme,the welding electrode comprises a steel core and a coating, wherein the steel core accounts for 70 wt%-90 wt% of the welding electrode and the coating accounts for 10 wt%-30 wt% of the welding electrode. The steel core comprises chemical components as follows: 0.01 wt%-0.06 wt% of C, 0.05 wt%-0.20 wt% of Si, 19.0 wt%-22.0 wt% of Cr, 22.0 wt%-24.0 wt% of Mn, 1.00 wt%-2.00 wt% of Mo, 0.50 wt%-0.90 wt% of N, less than or equal to 0.002 wt% of P, less than or equal to 0.003 wt% of S and the balance Fe and inevitable impurities. The coating comprises chemical components as follows: 25 wt%-28 wt% ofmarble, 17 wt%-20 wt% of fluorite, 3 wt%-5 wt% of lithium fluoride, 40 wt%-45 wt% of manganese nitride, 4 wt%-6 wt% of nickel powder, 2.5 wt%-4.5 wt% of molybdenum powder and the balance iron powder,and 10 wt%-15 wt% of binder is added during preparation of the coating. Weld metal formed by the welding electrode during high-nitrogen armor steel welding has high strength, plasticity and toughnessand can meet technical requirements of a new generation of armored equipment.

Description

technical field [0001] The invention belongs to the technical field of high nitrogen manual arc welding electrodes. It particularly relates to a high-nitrogen manual arc welding electrode suitable for welding high-nitrogen armor steel. Background technique [0002] With the development of armor protection technology to a higher level, the steel used for armor equipment has developed from 603, 616 to today's 675, 685, and the tensile strength has gradually increased from 1000MPa to 1700-1800MPa. The new generation of high-nitrogen armor steel (1Cr22Mn16N high-nitrogen steel) for armor equipment has high nitrogen content (mass fraction above 0.7%). Through solid solution strengthening, precipitation strengthening and fine grain toughening, the steel has high strength, high Plastic toughness and high elastic resistance. In addition, the addition of nitrogen also makes this type of steel have better corrosion resistance. [0003] At present, although the high-nitrogen armor s...

AI Technical Summary

Problems solved by technology

Therefore, the lack of welding rods has seriously restricted the application of high-nitrogen armor steel in high-tech equipment, and also restricted the development of a new generation of armor equipment technology to a certain extent.