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A method for smelting duplex stainless steel made of zg022cr22ni5mo3n

A technology of duplex stainless steel and process method, applied in the field of metal material metallurgy, can solve the problems of large differences in corrosion resistance, high and low production costs, difficult control of components, etc., achieve excellent corrosion resistance and welding performance, reduce production costs, The best mechanical properties

Active Publication Date: 2020-02-07
LUOYANG SUNRUI SPECIAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The invention is adopted when casting the dual-phase stainless steel guide vane body casting with the material of ZG022Cr22Ni5Mo3N, and the effect is good after implementation. The implementation process is as follows:

[0071] (1) Smelting in an intermediate frequency induction furnace

[0072] ①First add a small amount of active lime to the bottom of the furnace, and then add back charge, scrap, ferromanganese, ferrochrome, electrolytic nickel, ferromolybdenum and other alloy charge, then energize and melt, and slag sampling. The composition analysis result C: 3.0%, Si: 0.7%, Mn: 1.2%, S: 0.018%, P: 0.028%, Ni: 5.0, Cr: 21.3%, Mo: 2.7%, in line with the melting composition range of the duplex stainless steel intermediate frequency induction furnace in Table 3.

[0073] ② The tapping temperature of the initial molten steel in the intermediate frequency induction furnace is controlled at 1680℃.

[0074] ③The molten steel is poured into the AOD refining furnace by turning over....

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C33/06
CPCC21D2211/001C21D2211/005C22C33/06C22C38/001C22C38/004C22C38/02C22C38/04C22C38/44
Inventor 关军胜靳新锋陈亚涛郭绪镇王洛庆董武江李石民赵贵林
Owner LUOYANG SUNRUI SPECIAL EQUIP
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