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A kind of martensitic precipitation hardening stainless steel and its preparation method and application

A precipitation hardening, stainless steel technology, applied in the field of alloy steel manufacturing, can solve the problems of low strength, unable to meet the needs of stainless steel strength use, etc., to achieve the effect of improving purity, reducing inclusions in steel, and optimizing the preparation process

Active Publication Date: 2021-06-22
ZHANGJIAGANG POHANG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the production coils of 0Cr17Ni4Cu4Nb stainless steel disclosed in the prior art according to the disclosed chemical composition, after aging treatment, the strength of about 1000-1400MPa is obtained, which belongs to the low-strength grade and cannot meet the requirements for the strength of stainless steel in some environments Problem, the purpose of the present invention is to provide a martensitic precipitation hardening stainless steel and its preparation method and application, and improve the smelting process, hot rolling process, cold rolling process and annealing process for the chemical composition ratio of stainless steel , the yield strength of martensitic precipitation-hardened stainless steel coils is 1480-1600MPa, which meets the needs of use

Method used

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  • A kind of martensitic precipitation hardening stainless steel and its preparation method and application
  • A kind of martensitic precipitation hardening stainless steel and its preparation method and application

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Embodiment 1

[0045] This embodiment provides a martensitic precipitation hardening stainless steel, the chemical composition of the martensitic precipitation hardening stainless steel includes: C: 0.045%; Si: 1.62%; Mn: 0.72%; P: 0.025%; S : 0.0015%; Cr: 14.3%; Ni: 7.1%; Al: 0.04~0.06%; Mo: 0.65%; Cu: 0.82%; N: 0.01%; Ti: 0.32%; the balance is iron and other unavoidable Impurities. The martensitic precipitation hardening stainless steel is obtained by smelting, continuous casting, hot rolling, hot annealing pickling, cold rolling, cold rolling annealing pickling, smoothing and aging of the raw materials of martensitic precipitation hardening stainless steel; specifically:

[0046] A. Smelting and continuous casting: Through EAF+AOD+VOD+CCP, VOD adopts vacuum decarburization technology, vacuum stirring for 73 minutes, the inclusions in the steel are fully floating, effectively reducing the inclusions in the steel, using Al deoxidation to further reduce the Total in the steel[ O], thereby r...

Embodiment 2

[0054] This embodiment provides a martensitic precipitation hardening stainless steel, the chemical composition of the martensitic precipitation hardening stainless steel includes: C: 0.043%; Si: 1.74%; Mn: 0.77%; P: 0.0235%; S : 0.0020%; Cr: 14.5%; Ni: 7.17%; Al: 0.111%; Mo: 0.75%; Cu: 0.86%; N: 0.01%; Ti: 0.225%; the balance is iron and other inevitable impurities. The martensitic precipitation hardening stainless steel is obtained by smelting, continuous casting, hot rolling, hot annealing pickling, cold rolling, cold rolling annealing pickling, smoothing and aging of the raw materials of martensitic precipitation hardening stainless steel; specifically:

[0055] A. Smelting and continuous casting: Through EAF+AOD+VOD+CCP, VOD adopts vacuum decarburization technology, vacuum stirring for 73 minutes, the inclusions in the steel are fully floating, effectively reducing the inclusions in the steel, using Al deoxidation to further reduce the Total in the steel[ O], thereby redu...

Embodiment 3

[0063] This embodiment provides a martensitic precipitation hardening stainless steel, the chemical composition of the martensitic precipitation hardening stainless steel includes: C: 0.0557%; Si: 1.713%; Mn: 0.7%; P: 0.025%; S : 0.0016%; Cr: 14.4%; Ni: 7.14%; Al: 0.045%; Mo: 0.62%; Cu: 0.77%; N: 0.0068%; Ti: 0.34%; the balance is iron and other inevitable impurities. The martensitic precipitation hardening stainless steel is obtained by smelting, continuous casting, hot rolling, hot annealing pickling, cold rolling, cold rolling annealing pickling, smoothing and aging of the raw materials of martensitic precipitation hardening stainless steel; specifically:

[0064] A. Smelting and continuous casting: Through EAF+AOD+VOD+CCP, VOD adopts vacuum decarburization technology, vacuum stirring for 73 minutes, the inclusions in the steel are fully floating, effectively reducing the inclusions in the steel, using Al deoxidation to further reduce the Total in the steel[ O], thereby red...

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Abstract

The invention discloses a martensitic precipitation hardening stainless steel and its preparation method and application. The chemical composition includes: C0.04-0.06%; Si1.4-1.8%; Mn0.5-0.9%; ≤0.008%; Cr14~14.5%; Ni7~7.8%; Al0~0.15%; Mo0.55~0.7%; Cu0.7~1.0%; N0~0.03%; Ti0.28~0.35%; Other unavoidable impurities; the preparation steps include: smelting and continuous casting of each raw material, hot rolling, hot annealing pickling, cold rolling, cold rolling annealing pickling, leveling and aging. The advantage is that the chemical composition ratio of stainless steel is improved by improving the smelting process, hot rolling process, cold rolling process and annealing process, and finally obtaining a martensitic precipitation hardening stainless steel coil with a yield strength of 1480-1600Mpa.

Description

technical field [0001] The invention belongs to the technical field of alloy steel manufacture, and in particular relates to a martensitic precipitation hardening stainless steel and a preparation method and application thereof. Background technique [0002] High-strength stainless steel is widely used in aviation, aerospace, ocean, nuclear industry and other fields, among which martensitic high-strength stainless steel is the most widely used. Martensitic high-strength stainless steel is a stainless steel whose properties can be adjusted by heat treatment. According to the element composition, martensitic high-strength stainless steel is divided into aging stainless steel and precipitation hardening stainless steel. Among them, the martensitic precipitation hardening stainless steel has the advantages of high strength, good toughness and excellent corrosion resistance after heat treatment. At present, the martensitic precipitation hardening stainless steel commonly used i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/34C22C38/42C22C38/44C22C38/50C21C7/06C21D1/26C21D6/00C21D8/02C21D9/00C22C33/04
CPCC21C7/0006C21C7/06C21D1/26C21D6/004C21D6/005C21D6/008C21D8/0221C21D9/0081C21D2211/008C22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/34C22C38/42C22C38/44C22C38/50
Inventor 吴辉荣青亮陈刚
Owner ZHANGJIAGANG POHANG STAINLESS STEEL
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