Low-nickel nitrogen-containing austenitic stainless steel non-consumable electrode gas shielded welding wire and preparation method thereof

Abstract

The invention discloses a low-nickel nitrogen-containing austenitic stainless steel non-consumable electrode gas shielded welding wire and a preparation method thereof. The invention belongs to the technical field of welding material preparation and welding machining processes thereof. The low-nickel nitrogen-containing austenitic stainless steel non-consumable electrode gas shielded welding wireand the preparation method solve the technical problems that when an existing austenitic stainless steel welding wire is used for conducting non-consumable electrode gas shielded welding on low-nickelnitrogen-containing austenitic stainless steel, nitrogen loss, air holes, hot cracks in a weld joint area and nitride precipitation in a heat affected zone are prone to being generated in a welded joint, and consequently pitting corrosion is caused. The low-nickel nitrogen-containing austenitic stainless steel non-consumable electrode gas shielded welding wire comprises the following chemical components including, by weight, 0.03% to 0.08% of C, 0.30% to 0.65% of Si, 6.50% to 8.50% of Mn, less than or equal to 0.05% of P, less than or equal to 0.01% of S, 17.50% to 18.50% of Cr, 2.20% to 2.90% of Ni, 0.03% to 0.10% of Mo, 1.00% to 2.00% of Cu, 0.15% to 0.35% of N, less than or equal to 0.05% of Co, less than or equal to 0.05% of the sum of Nb, Ti and V and the balance iron. The method comprises the steps of smelting, wire rod hot rolling and welding wire drawing, and finally the welding wire is obtained. According to the low-nickel nitrogen-containing austenitic stainless steel non-consumable electrode gas shielded welding wire and the preparation method, solid solution nitrogen is used for partially replacing nickel, and grain refinement can be promoted while nitrogen is effectively subjected to solid solution strengthening.

Description

technical field [0001] The invention belongs to the technical field of welding material preparation and welding processing technology, and in particular relates to a low-nickel nitrogen-containing austenitic stainless steel non-melting gas shielded welding wire and a preparation method thereof. Background technique [0002] Low-nickel-nitrogen-containing austenitic stainless steel non-melting electrode gas-shielded welding wire uses N element in the wire to partially replace Ni element to promote the formation of austenite structure, which can effectively reduce the appearance of chromium-poor areas and improve the pitting resistance of welded joints. Reduced production costs. [0003] Low-nickel nitrogen-containing austenitic stainless steel is widely used in shipbuilding, aviation, petrochemical and other industries because of its good shape, corrosion resistance and economy. However, when conventional austenitic stainless steel wire (ER308L / ER309L) is used for non-meltin...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that nitrogen element loss, pores, thermal cracks in the weld zone and heat-affected zones are prone to occur in welded joints when the existing austenitic stainless steel welding wire performs non-melting electrode gas shielded welding on low-nickel nitrogen-containing austenitic stainless steel. The technical problem of pitting corrosion caused by the precipitation of nitrides provides a low-nickel nitrogen-containing austenitic stainless steel non-melting electrode gas-shielded welding wire and its preparation method