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High-strength stainless steel, heat treatment process and forming member

A technology for forming components and high strength, applied in the field of heat treatment process and forming components, high-strength stainless steel, can solve the problem of stability of performance without realizing the problem of corrosion resistance decline, quenching temperature has great influence on performance, narrow process window, etc. problems, to achieve the effects of improved plastic toughness, high strength and plasticity, and a large process window.

Inactive Publication Date: 2019-04-09
IRONOVATION MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, this paper only applied the Q&P process to 3Cr13 steel tentatively, and did not realize the problem of corrosion resistance decline caused by a large number of unsolubilized chromium carbides during high-temperature solution treatment and the stability of its performance. Temperature has a great impact on performance, and the process window is narrow, making it difficult for industrial applications

Method used

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  • High-strength stainless steel, heat treatment process and forming member
  • High-strength stainless steel, heat treatment process and forming member

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Embodiment Construction

[0034] The high-strength stainless steel of the present invention comprises: 0.2-0.35% of C, 0.7-3.50% of Mn, 0.6-2.0% of Si, 11.0-17.0% of Cr, less than or equal to 0.20% of Nb, less than or equal to 0.20% %Ti. Among them, the C content is preferably 0.2-0.3%, the Cr content is preferably 12.0-14%, the Nb content is preferably less than or equal to 0.10%, and the Ti content is preferably less than or equal to 0.10%. One or more of the group consisting of: 2.0% or less Mo; 1.0% or less W; 1.0% or less V; 3.0% or less Cu; 4.0% or less Ni; 0.4% or less Zr. The balance is Fe and impurities.

[0035] The content range of each chemical component will be described respectively below.

[0036] C: 0.20~0.35%, preferably 0.2~0.3%

[0037] In the steel of the present invention, carbon is the most important strengthening element, which improves the strength through solid solution strengthening and dispersion precipitation strengthening. In addition to being a strengthening element, ...

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Abstract

The invention relates to high-strength stainless steel, a heat treatment process and a forming member. The high-strength stainless steel is prepared from the following components according to weight percent: 0.2 to 0.35% of C, 0.7 to 3.50% of Mn, 0.6 to 2.0% of Si, 11 to 17% of Cr, less than or equal to 0.20% of Nb, less than or equal to 0.20% of Ti and the balance of Fe and impurities. The heat treatment process comprises the following steps of (a) heating the high-strength stainless steel to 1000 to 1200 DEG C, and then insulating for 1 to 3600 s; (b) cooling the high-strength stainless steel treated in the step (a) below 100 DEG C; and (c) heating the high-strength stainless steel treated in the step (b) to 150 to 400 DEG C, then insulating for 10 to 10000 s, and then cooling to room temperature in any cooling mode. The forming member is made of the high-strength stainless steel, and the microstructure of the forming member is composed of 5% to 30% of retained austenite, 70% to 95%of martensite, less than 1% of Nb and Ti carbide and less than 2% of Cr carbide in an area.

Description

Technical field [0001] The invention relates to a high-strength stainless steel, a heat treatment process and a formed component. Background technique [0002] Commonly used martensitic chromium stainless steels (Cr13, Cr13Mo, etc.) are widely used in cutting tools, turbine blades, bearings, valves, structural parts, and wear-resistant parts due to their good corrosion resistance and high strength. After quenching and tempering, the hardness of this type of stainless steel is still very high, and the toughness is improved. As the carbon content increases, the hardness gradually increases, but the toughness and corrosion resistance gradually decrease. [0003] The most common and cheapest way to use high-strength stainless steel is to significantly increase the hardness by increasing the carbon content in the composition, but at the same time the toughness is sharply reduced, and it is difficult to completely dissolve chromium carbides during high-temperature solution treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/38C22C38/34C22C38/26C22C38/28C22C38/18C22C38/22C22C38/24C22C38/20C22C38/40C22C38/58C22C38/50C22C38/48C22C38/42C22C38/44C22C38/46C21D6/00
CPCC21D6/002C22C38/02C22C38/04C22C38/26C22C38/28C22C38/34C22C38/38C21D2211/008C21D2211/001C21D6/005C21D6/008Y02P10/20
Inventor 易红亮邓彪王国栋熊小川
Owner IRONOVATION MATERIALS TECH CO LTD
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