ZG022Cr22Ni5Mo3N material duplex stainless steel smelting process

Abstract

The invention discloses a ZG022Cr22Ni5Mo3N material duplex stainless steel smelting process. A medium-frequency induction furnace smelting process and an AOD furnace refining process are performed insequence; nitrogen alloying can be realized through nitrogen blowing; carbon in steel can be removed to reach a requested target value; the contents of harmful elements such as sulfur, oxygen and hydrogen in the steel can be reduced to the greatest extent, so that the purity and the quality of molten steel are greatly improved; poured castings achieve excellent welding performance, fatigue resistance and mechanical performances; the metallographic structure is uniform; the two-phase ratio is near 50%; the corrosion resistance is excellent; and the hot tearing and cold tearing tendency is reduced at the same time, so that the service life of the castings is prolonged, the manufacturing cost is greatly reduced, and the purposes of energy conservation, consumption reduction and environmentalprotection are achieved.

Description

technical field [0001] The invention belongs to the metallurgy field of metal materials, and specifically relates to a ZG022Cr22Ni5Mo3N material duplex stainless steel smelting process method. Background technique [0002] Duplex stainless steel is stainless steel in which the ferrite 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 properties makes duplex stainless steel have the advantages of two phases. It is widely used all over the world, mainly in oil and gas, chemical industry, marine engineering, shipbuilding, papermaking, food and light industry, and construction. ZG022Cr22Ni5Mo3N is used as ultra-low carbon , a typical representative of nitrogen-containing duplex stainless steel, is the most economical stainless steel metal material, and its comp...

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