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Metastable austenitic stainless steel band or sheet and manufacturing method therefor

A technology of austenitic stainless steel, manufacturing method, applied in the direction of manufacturing tools, furnace types, furnaces, etc., which can solve the problems of reduced ductility of parts, deformation size of formed parts, and reduced toughness of parts, etc.

Active Publication Date: 2018-04-17
TOKUSHU KINZOKU EXCEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this steel grade, since precipitation hardening heat treatment is required after forming processing, not only the cost of secondary processing manufacturers increases, but also there are problems of deformation of formed parts and dimensional deviation due to heat treatment
In addition, since the ductility of the part itself decreases due to precipitation hardening, the toughness of the part itself decreases

Method used

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  • Metastable austenitic stainless steel band or sheet and manufacturing method therefor
  • Metastable austenitic stainless steel band or sheet and manufacturing method therefor
  • Metastable austenitic stainless steel band or sheet and manufacturing method therefor

Examples

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Embodiment

[0097] Hereinafter, examples will be described together with comparative examples.

[0098] Example steel grade 1 and comparative example steel grades 2 to 4 having different Mo contents were prepared. Table 1 shows its chemical composition. Next, in Example steel type 1 in Table 1, steels having a metal structure within the range of the present invention (identification 1 to 5 samples) and steels having a metal structure outside the range of the present invention (identification 6 , 7 samples). Table 2 shows the metallographic structures of these steels. In addition, Table 3 shows the production conditions of these steels. The hardness (HV), tensile strength (Ts), 0.2% proof strength (YS), and elongation (EL) of the produced steel (samples identified 1 to 7) were measured and shown in Table 4, respectively. In addition, in Tables 1-4, the numerical value with "*" attached to the left side shows the value outside the range of this invention.

[0099] Table 1 (composition)...

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Abstract

Provided are a metastable austenitic stainless steel band or sheet with both high strength and high ductility, and a manufacturing method therefor. A metastable austenitic stainless steel band or sheet: contains, in mass%, C; 0.05-0.15%, Si: 0.05-1%, Mn: 2% or less, Cr: 16-18%, Ni: 4-11%, Mo: 2.5-3.5%, the balance being made of Fe and unavoidable impurities; has a two-phase structure of alpha' phases and gamma phases, the gamma phases being configured from gamma T phases and gamma R phases, the total of the gamma T phases and gamma R phases being 15-50 volume%, and the gamma T phase area ratiodefined in equation (2) (=100x(total area ratio of gamma T phases occupying the entire observed area) being 1% to 20%; and has characteristics that satisfy 0.2% yield strength (YS) being 1400 N / mm2-1900 N / mm2 and "YSxEL value" (YS.EL) being 21000-48000.

Description

technical field [0001] The invention relates to a metastable austenitic stainless steel strip or steel plate with a good balance of strength and ductility and a manufacturing method thereof. Background technique [0002] Functional parts of precision equipment represented by smartphones, notebook computers, and cameras, and high-durability skeleton structural parts such as automobiles and aircrafts are required to meet the requirements for processability and dimensional accuracy while achieving high strength. And bring thin wall and light weight. Furthermore, due to the reduction in size and weight of the equipment, the load when the components are driven increases, so good durability such as strength capable of withstanding severe use and repeated fatigue strength is required. [0003] In particular, in automotive frame structural parts, developments related to high strength and high ductility have been vigorously pursued. For example, γ-SUS and TWIP (Twinning Induced Pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/58
CPCC21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0236C21D8/0247C21D9/52C21D2211/001C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/04C22C38/44C21D9/46C22C38/00C22C38/58C22C38/42
Inventor 松村雄太小川恭平田中慎一细谷佳弘平田辰美
Owner TOKUSHU KINZOKU EXCEL
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