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High-nitrogen nickel-free super two-phase stainless steel

A technology of duplex stainless steel and stainless steel, which is applied in the field of alloy materials, can solve the problems of insufficient strength, toughness, acid resistance, corrosion resistance and wear resistance, and high manufacturing cost of duplex stainless steel, and achieve low manufacturing cost, good corrosion resistance and fatigue resistance. Effect of wear resistance and good chloride stress corrosion resistance

Inactive Publication Date: 2012-03-21
江苏亚盛金属制品有限公司
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high manufacturing cost and insufficient strength, toughness, acid resistance, corrosion resistance and wear resistance of duplex stainless steel

Method used

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Embodiment Construction

[0012] Preferred embodiments of the present invention will be described in detail below.

[0013] In this embodiment, the high-nitrogen nickel-free super duplex stainless steel adopts the latest formula of high-nitrogen nickel-free adding rare earth metal elements. The percentage composition is as follows: 24.5~25%Cr, 15~15.8%Mn, 2.8~3.0%Mo, 0.40~0.48%N, ≤0.012%C, 0.12%Ce or Y, ≤1.0%Si, ≤0.01%S , ≤0.02%P, ≤0.01%B, and the balance is Fe. According to this composition, the raw material ingredients are baked and dehumidified, then melted in an intermediate frequency induction furnace or an electric arc furnace, and then cast into ingots. The AOD refining furnace adopts the argon-oxygen decarburization refining technology, and the partial pressure of CO is reduced by adjusting the type and volume of the supplied gas. Realize the purpose of reducing carbon and maintaining chromium.

[0014] The beneficial effect of this embodiment is that it can be widely used in manufacturing in...

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Abstract

The invention provides high-nitrogen nickel-free super two-phase stainless steel, comprising the following components in percentage by weight: 24-26% of Cr, 14-20% of Mn, 2.0-4.0% of Mo, 0.30-0.55% of N, 0.01-0.03% of C, 0.05-0.2% of Ce or Y, less than or equal to 1.0% of Si, less than or equal to 0.01% of S, less than or equal to 0.02% of P, less than or equal to 0.01% of B and the balance of Fe. The high-nitrogen nickel-free super two-phase stainless steel has the characteristics of low manufacturing cost, high strength, high toughness, corrosion resistance and wearing resistance, can be widely applied in equipment of the manufacturing industries such as petroleum, chemical engineering, ship building, papermaking, food, medicines and the like and the fields such as environmental protection, aerospace, urban rail transit and the like, and products such as stainless steel corrosion-resistance alloy plates, pipes, steel wire ropes, casting and forging pieces and the like.

Description

technical field [0001] The invention relates to an alloy material, in particular to a high-nitrogen nickel-free super duplex stainless steel. Background technique [0002] As a special alloy, stainless steel has unique advantages. With the advancement of technology and economic development, its application range has become more and more extensive, and it has now spread to every corner of our lives. [0003] Among them, duplex stainless steel has been developed to the third generation since its birth in the United States in the 1940s; The content of few phases needs to reach at least 30% stainless steel; its main feature is that the yield strength can reach 400-550MPa, which is twice that of ordinary stainless steel, so it can save materials and reduce equipment manufacturing costs. In terms of corrosion resistance, especially under the condition of harsh medium environment (such as seawater with high chloride ion content), duplex stainless steel has significantly better res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38
Inventor 蒋东华蒋红俊周江
Owner 江苏亚盛金属制品有限公司
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