High-strength high-toughness high-nitrogen austenitic stainless steel welding wire and preparation method thereof

Abstract

The invention relates to a high-strength high-toughness high-nitrogen austenitic stainless steel welding wire and a preparation method thereof. The welding wire is prepared from the alloy components in percentage by weight: less than 0.1 percent of C, less than 0.02 percent of S, less than 0.03 percent of P, 0.1 to 0.9 percent of Si, 5 to 21 percent of Mn, 15 to 23 percent of Cr, 0 to 8 percent ofNi, 0 to 5 percent of Mo, 0.2 to 0.95 percent of N, the balance Fe, and less than 0.1 percent of other impurities. The preparation process comprises the steps of smelting through an induction furnace, electro slags remelting, hot forging, hot rolling, heat treating, and drawing of the welding wire. According to the welding wire provided by the invention, the component proportion is scientific andreasonable, the content of nitrogen elements is increased, the content of manganese elements is adjusted, and the solid solubility of the nitrogen is increased, so that the prepared welding wire is stable in welding process, less in escape amount of hydrogen elements, less in blowhole defects, good in welding processability, high in deposited metal strength, excellent in impact toughness at the temperature of minus 40 DEG C, suitable for welding high-nitrogen austenitic stainless steel, particularly suitable for welding the austenitic stainless steel with the requirement on low-temperature impact toughness, and capable of being surfacing-welded so as to be used as anti-corrosion layers for other steel and iron materials.

Description

Technical field [0001] The invention belongs to the technical field of welding materials and processing technology, and relates to a high-strength, high-toughness, high-nitrogen austenitic stainless steel welding wire and a preparation method thereof, in particular to a high-nitrogen austenitic stainless steel specially used for welding high-nitrogen austenitic stainless steel Welding wire and its preparation process. Background technique [0002] High nitrogen austenitic stainless steel uses N element instead of expensive alloying element Ni as austenite stabilizing element to obtain austenitic structure. It is a resource-saving low-cost austenitic stainless steel. High nitrogen austenitic stainless steel has the characteristics of high strength and toughness, and still has a high strength and toughness match at low temperature (4K). In addition, high nitrogen austenitic stainless steel has good corrosion resistance due to the addition of nitrogen, especially pitting corrosion ...

AI Technical Summary

Problems solved by technology

[0004] The first technical problem to be solved by the present invention is to provide a high-strength, high-toughness high-nitrogen austenitic stainless steel welding wire to solve the problem of reducing the strength and toughness of the existing high-nitrogen austenitic stainless steel weld metal due to nitrogen loss and nitrogen pore defects. question

[0005] The second technical problem to be solved by the present invention is to provide a method for preparing high-strength, high-toughness, high-nitrogen austenitic stainless steel welding wire. Hole defects reduce strength and toughness issues