A method for smelting duplex stainless steel made of zg022cr22ni5mo3n

Abstract

A method for smelting duplex stainless steel made of ZG022Cr22Ni5Mo3N. The intermediate frequency induction furnace smelting process and the AOD furnace refining process are carried out in sequence. Not only can nitrogen alloying be achieved by blowing nitrogen, but the carbon content in the steel can be removed to the required target value, while the steel The content of harmful elements such as sulfur, oxygen, hydrogen and other elements can be reduced to the minimum, the purity and quality of molten steel are greatly improved, and the poured castings have excellent welding performance, fatigue resistance and mechanical properties, and the metallographic structure is uniform. The phase ratio is close to 50%, with excellent corrosion resistance, while reducing the tendency of hot cracking and cold cracking, prolonging the service life of castings, greatly reducing manufacturing costs, and achieving the goals of energy saving, consumption reduction, and environmental protection.

Description

Technical field [0001] The invention belongs to the field of metal material metallurgy, in particular to a smelting process method of ZG022Cr22Ni5Mo3N material duplex stainless steel. Background technique [0002] Duplex stainless steel is a stainless steel in which the ferritic phase and austenite phase each account for about half of the structure. Duplex stainless steel combines the excellent toughness of austenitic stainless steel with the higher strength and chloride stress corrosion resistance of ferritic stainless steel. The combination of performance makes duplex stainless steel have the advantages of two phases. It is widely used worldwide. It is mainly used in oil and gas, chemical industry, marine engineering, shipbuilding, papermaking, food and light industry, and construction. ZG022Cr22Ni5Mo3N is an ultra-low carbon The typical representative of nitrogen-containing duplex stainless steel is the most economical stainless steel metal material. Its composition range is s...

AI Technical Summary

Problems solved by technology

[0005] At present, the intermediate frequency induction furnace melting process, intermediate frequency induction furnace + AOD furnace double melting process, electric arc furnace + AOD furnace double melting process, intermediate frequency induction furnace melting process, intermediate frequency Induction furnace + VOD furnace dual smelting process and electric arc furnace + VOD furnace dual smelting process, etc. These smelting processes can produce duplex stainless steel that meets the composition requirements, but the quality of molten steel is uneven and the composition fluctuates greatly , Corrosion resistance is quite different, and the production cost is different

[0006] Melting duplex stainless steel in an intermediate frequency induction furnace requires the use of pure furnace materials with very low carbon content, such as pure iron, metal chromium, metal molybdenum, electrolytic manganese, crystalline silicon, ferromanganese nitride and other metal materials, and the composition is not easy to control and production is difficult. Large, low yield, highest production cost