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Martensite precipitation hardening stainless steel as well as preparation method and application thereof

A precipitation hardening and stainless steel technology, which is applied in the field of alloy steel manufacturing, can solve the problems of stainless steel strength, low strength, etc., and achieve the effects of reducing inclusions in steel, improving purity, and optimizing the preparation process

Active Publication Date: 2020-08-25
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, the chemical composition ratio of stainless steel, the smelting process, hot rolling process, cold rolling process and annealing process are improved , the yield strength of the martensitic precipitation hardening stainless steel coil is finally obtained is 1480-1600Mpa, which meets the needs of use

Method used

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  • Martensite precipitation hardening stainless steel as well as preparation method and application thereof
  • Martensite precipitation hardening stainless steel as well as preparation method and application thereof

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Effect test

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 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 reducing the fo...

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 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 reducing the f...

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Abstract

The invention discloses martensite precipitation hardening stainless steel as well as a preparation method and application thereof. The stainless steel comprises the following chemical components of 0.04%-0.06% of C, 1.4%-1.8% of Si, 0.5%-0.9% of Mn, less than or equal to 0.035% of P, less than or equal to 0.008% of S, 14%-14.5% of Cr, 7%-7.8% of Ni, 0%-0.15% of Al, 0.55%-0.7% of Mo, 0.7%-1.0% ofCu, 0%-0.03% of N, 0.28%-0.35% of Ti, and the balance iron and other unavoidable impurities. The preparation method comprises the steps of performing smelting and continuous casting, hot rolling, thermal annealing pickling, cold rolling, cold rolling annealing pickling, leveling and aging on all raw materials. The stainless steel and the method have the advantages that the proportion of the chemical components of the stainless steel, a smelting process, a hot rolling and calendaring process, a cold rolling and calendaring process and an annealing process are improved, and finally a martensiteprecipitation hardening stainless steel coiled plate with the yield strength of 1480 Mpa-1600 Mpa is obtained.

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. The martensitic precipitation hardening stainless steel commonly used in the market...

Claims

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Application Information

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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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