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

A technology of austenitic stainless steel and gas-shielded welding wire, applied in welding equipment, manufacturing tools, welding media, etc., can solve problems such as hot cracks in the weld zone, loss of nitrogen element, pitting corrosion of nitride precipitation, etc., and achieve the goal of depositing metal High strength, less pore defects, and the effect of promoting grain refinement

Active Publication Date: 2020-11-03
HARBIN WELDING INST LTD +2
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  • Abstract
  • Description
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  • Application Information

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

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0033] Embodiment 1: The chemical composition and proportion of a low-nickel nitrogen-containing austenitic stainless steel non-melting electrode gas shielded welding wire according to the weight percentage are C: 0.03%-0.08%, Si: 0.30%-0.65 %, Mn: 6.50% to 8.50%, P: ≦0.05%, S: ≦0.01%, Cr: 17.50% to 18.50%, Ni: 2.20% to 2.90%, Mo: 0.03% to 0.10%, Cu: 1.00% ~2.00%, N: 0.15%~0.35%, Co:≦0.05%, Nb+Ti+V≦0.05%, and the rest iron composition.

[0034] The method for preparing the above-mentioned low-nickel nitrogen-containing austenitic stainless steel non-melting electrode gas-shielded welding wire is carried out according to the following steps:

[0035] 1. Material preparation: according to the chemical composition and proportion of the welding wire, weigh the furnace charge of pure iron, massive ferrochromium, chromium carbide, chromium nitride, nickel plate, electrolytic manganese, ferrosilicon, metal molybdenum, copper block, aluminum particles, silicon calcium Block and silic...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/58B23K35/30B23K35/40C22C33/06
CPCB23K35/3086B23K35/40C22C33/06C22C38/001C22C38/02C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/58
Inventor 方乃文徐锴徐亦楠夏敏陈波贾玉力王国佛林晓辉杨义成马一鸣王庆江李丹晖王猛王健金喜庆
Owner HARBIN WELDING INST LTD
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