steel plate

A steel plate and chemical composition technology, applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of mechanical property deviation, inability to obtain sufficient reaction force characteristics and collision characteristics, and achieve the effect of stable yield strength
CN107923007BActive Publication Date: 2020-05-05NIPPON STEEL CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NIPPON STEEL CORP
Publication Date
2020-05-05

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Abstract

The present invention relates to a steel plate having a predetermined chemical composition, a steel structure containing 2% or more of ferrite and bainite in terms of area fraction, an average dislocation density in ferrite and an average dislocation density in bainite. The error density is 3×10 12 m / m 3 ~1×10 14 m / m 3 , the average grain size of ferrite and bainite is 5 μm or less.
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Description

technical field

[0001] The present invention relates to a steel plate suitable for automobile components which can obtain excellent crash characteristics. Background technique

[0002] Generally speaking, when using a steel plate to manufacture an automobile body, forming, welding, and coating baking of the steel plate are performed. Therefore, steel sheets for automobiles are required to have excellent formability, high strength after coating and baking, and excellent crash characteristics. Conventionally, examples of steel sheets used in automobiles include dual phase (DP) steel sheets having a dual-phase structure of ferrite and martensite, and transformation induced plasticity (TRIP) steel sheets.

[0003] However, the problem with DP steel sheets and TRIP steel sheets is that the mechanical properties after coating and baking tend to vary within the member. That is, in the forming of the steel sheet, since strain is applied according to the shape of the member to be o...

Claims

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