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High-strength high-ductility steel sheet

A ductile, high-strength technology, applied in furnace type, furnace, heat treatment furnace, etc., to achieve high work hardening rate and excellent strength-ductility balance

Active Publication Date: 2017-08-01
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the characteristics of the rolling direction and the rolling direction perpendicular to the rolling direction, which are general ductility evaluation directions, are not specifically stated, and it cannot be considered that they meet the above-mentioned required level.

Method used

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  • High-strength high-ductility steel sheet
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  • High-strength high-ductility steel sheet

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Experimental program
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Embodiment Construction

[0031] In order to solve the above-mentioned problems, the inventors of the present invention determined that the tensile strength (TS) × elongation (EL) × Various investigations have been carried out on methods for stretch flange performance (λ) of 1,000,000 MPa·%·% or more. As a result, it is thought that the above-mentioned desired characteristics can be ensured by the following considerations and studies.

[0032] That is, in order to further improve the strength-ductility balance compared to conventional techniques, it is necessary to more effectively utilize retained austenite (hereinafter also expressed as "retained γ") that promotes the TRIP phenomenon. However, from the viewpoint of securing the weldability of the steel sheet, there is a limit to increasing the amount of residual γ and the average carbon concentration in the residual γ because there is an upper limit on the C content in the steel sheet.

[0033] Therefore, the present inventors paid attention to the ...

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Abstract

A high-strength, high-ductility steel sheet including a characteristic alloy component, the steel structure thereof including 8 area% residual austenite with respect to the entire structure, the remainder being one or more of bainite, martensite, tempering bainite, and tempering martensite, and the average carbon concentration and the standard deviation of the carbon concentration distribution in the residual austenite each being in a specific range.

Description

technical field [0001] The present invention relates to a high-strength, high-ductility steel sheet useful as a thin steel sheet for automobiles, and more specifically, to a technology for improving the balance of strength and ductility of a steel sheet. Background technique [0002] For example, in steel sheets used in automobile frame parts, etc., further high strength is required for the purpose of collision safety and fuel consumption reduction due to weight reduction of the car body, and in order to process into frame parts with complex shapes, other than In addition to being required to have excellent formability, weldability at the time of assembling components by joining them is also required. Therefore, it is desired to develop a steel sheet that can ensure a yield ratio (YR) of 0.7 or more while suppressing the carbon content to 0.3% by mass or less as specifically required mechanical properties (hereinafter, simply referred to as "properties"). , Tensile Strength...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/06C22C38/58C21D9/46
CPCC22C38/00C22C38/06C22C38/58C21D6/005C21D6/008C21D8/005C21D8/0247C21D8/04C21D8/0405C21D8/0421C21D8/0426C21D8/0436C21D8/0447C21D2211/002C21D2211/008C21D9/46C21D1/20C21D8/0205C21D8/0226C21D8/0236C22C38/002C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18C21D2211/001
Inventor 村上俊夫大谷茂生
Owner KOBE STEEL LTD