A high-nitrogen metal powder-cored flux-cored wire suitable for welding high-nitrogen armor steel

Abstract

The invention relates to a high-nitrogen metal powder core flux-cored wire applicable to high-nitrogen armor steel welding. According to the technical scheme, the high-nitrogen metal powder core flux-cored wire is composed of a steel band and flux core powder, wherein the steel band and the flux core powder account for 60 to 70 wt% and 30 to 40 wt% of the high-nitrogen metal powder core flux-coredwire in sequence. The steel band is composed of the following chemical components: 0.01 to 0.05 wt% of C, 0.05 to 1.00 wt% of Si, 2.00 to 15.00 wt% of Mn, 14.00 to 17.00 wt% of Cr, less than or equalto 0.002 wt% of P, less than or equal to 0.03 wt% of S and the balance of Fe and unavoidable impurities. The flux core powder is composed of the following chemical components: 0.5 to 1.2 wt% of lithium fluoride, 0.5 to 1.0 wt% of rare earth fluoride, 25 to 30 wt% of chromium nitride, 43 to 48 wt% of manganese powder, 12 to 17 wt% of nickel powder, 8 to 12 wt% of molybdenum powder and the balanceof iron powder. When the high-nitrogen metal powder core flux-cored wire is used, electric arc is stable, the molding performance is good and all-direction welding can be realized; and weld metal forthe high-nitrogen armor steel welding has high strength and high plasticity and toughness and meets the technical requirements of new-generation armored equipment.

Description

technical field [0001] The invention belongs to the technical field of high nitrogen metal powder cored flux cored wire. In particular, it relates to a high-nitrogen metal powder-cored flux-cored welding wire 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%), and through solid solution strengthening, precipitation strengthening and fine-grain strengthening and toughening mechanism, this steel has high strength, High plastic toughness, high elastic resistance. In addition, the addition of nitrogen also makes this type of steel have better corrosion performance. [...

AI Technical Summary

Problems solved by technology

Due to the lack of metal powder-cored flux-cored wire matched with high-nitrogen armor steel, the application of high-nitrogen armor steel in high-tech armor equipment is restricted to a certain extent, and the development of a new generation of armor protection technology is also restricted.