Super advanced double-phase stainless steel smelting process method of CD3MWN material

Abstract

The invention relates to a super advanced double-phase stainless steel smelting process method of a CD3MWN material. According to the invention, internal control components during double-phase stainless steel smelting is designed, wherein C is less than or equal to 0.030 wt%, Si is less than or equal to 0.90 wt%, Mn is 1.20-2.50 wt%, P is less than or equal to 0.020 wt%, S is less than or equal to0.015 wt%, and Cr is 26.2-27.5 wt%, Ni is 6.2-7.6 wt%, Mo is 2.2-3.4 wt%, Cu is less than or equal to 0.80 wt%, W is less than or equal to 0.80 wt%, N is 0.32-0.38 wt%, B is 0.0010-0.0100 wt%, Ba is0.0002-0.0100 wt%, and Ce+La is 0.005- 0.030 wt%; and %Cr+3.3 (%Mo+0.5%W)+16%N is less than or equal to 45, the content of trace elements B, Ba, Ce, and La can be precisely controlled; the N content is increased to 0.30% or more, and at the same time, nitrogen holes in the casting can be avoided; and the content of harmful elements such as sulfur, oxygen, hydrogen and the like is minimized to improve the purity of the molten steel. The cast casting has high strength and excellent corrosion resistance. In the stainless steel, a ferrite phase and an austenite phase are close to 50%, the castinglife is prolonged. the production costs are greatly reduced, and purposes of energy saving and environmental protection can be realized.

Description

technical field [0001] The invention belongs to the field of metal material metallurgy, and in particular relates to a process method for smelting super-advanced duplex stainless steel made of CD3MWN using an intermediate frequency induction furnace. 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 both types of stainless steel materials, and 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. [0003] However, for more demanding application environments, such as marine and deep-sea fiel...

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Problems solved by technology

[0010] 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., using these smelting processes, duplex stainless steel that meets the composition requirements can be smelted, but the quality of molten steel is uneven and the composition fluctuates greatly. , Corrosion resistance is quite different, and the production cost is different

[0011] Intermediate frequency induction furnace + AOD furnace dual smelting process, electric arc furnace + AOD furnace dual smelting process, intermediate frequency induction furnace + VOD furnace dual smelting process and electric arc furnace + VOD furnace dual smelting process, the requirements for furnace materials are not very strict. Alloy charge can be used, such as returned furnace charge, scrap steel, ferromanganese, ferrochrome, electrolytic nickel, ferromolybdenum, etc., but the equipment investment is large, and it must be equipped with a refining furnace, which is suitable for large-scale production; dust, smoke and noise pollution, not environmentally friendly; induction furnace smelting is relatively environmentally friendly, and the production characteristics are highly adaptable, but the requirements for alloy furnace materials are higher

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