Steel sheet

a technology of steel sheets and spherical sheets, applied in the field of steel sheets, can solve the problems of mechanical properties and failure to obtain a sufficient reaction force characteristic, and achieve the effect of stable yield strength
US20180237881A1Inactive Publication Date: 2018-08-23NIPPON STEEL CORP
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
NIPPON STEEL CORP
Publication Date
2018-08-23
Estimated Expiration
Not applicable · inactive patent
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Abstract

A steel sheet includes: a predetermined chemical composition; and a steel structure containing, in are a fraction, 2% or more of ferrite and bainite, in which an average dislocation density in the ferrite and an average dislocation density in the bainite are both h3×1012 m / m3 to 1×1014 m / m3, and an average grain diameter of the ferrite and the bainite is 5 μm or less.
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Description

TECHNICAL FIELD

[0001] The present invention relates to a steel sheet capable of obtaining an excellent crashworthiness suitable for an automobile member.BACKGROUND ART

[0002] In the case of manufacturing an automotive vehicle body using a steel sheet, molding, welding, and paint baking of the steel sheet are performed generally. Thus, the steel sheet for automobile is required to have excellent formability, a high strength after paint baking, and an excellent crashworthiness. As a steel sheet used for an automobile, conventionally, a dual phase (DP) steel sheet having a dual phase structure of ferrite and martensite and a transformation induced plasticity (TRIP) steel sheet have been cited.

[0003] However, the DP steel sheet and the TRIP steel sheet have a problem that their mechanical properties after paint baking sometimes vary in a member. That is, in molding of the steel sheet, strain is applied according to the shape of a member to be obtained, and thus the molded steel sheet includ...

Claims

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