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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

Active Publication Date: 2020-05-05
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the problem with DP steel sheets and TRIP steel sheets is that the mechanical properties after coating and baking tend to deviate within the member
In this case, the portion to which little strain is applied is soft, and folding may occur in this portion, so sufficient reaction force characteristics and collision characteristics cannot be obtained.

Method used

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Examples

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Embodiment

[0117] Embodiments of the present invention will be described below. The conditions of the examples are examples of conditions employed to confirm the feasibility and effects of the present invention, and the present invention is not limited to the examples of conditions. In the present invention, various conditions can be adopted as long as the object of the present invention can be achieved without departing from the gist of the present invention.

[0118] (1st test)

[0119] In the first test, steel having the chemical composition shown in Table 1 was melted to produce a steel slab, and the steel slab was heated to 1200°C to 1250°C for hot rolling. In hot rolling, rough rolling and finish rolling were performed. The empty column in Table 1 indicates that the content of this element is lower than the detection limit, and the rest is Fe and impurities. Underlines in Table 1 indicate that the values ​​deviate from the range of the present invention.

[0120]

[0121] Th...

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PUM

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/14C22C38/58
CPCC22C38/00C22C38/14C22C38/58C21D9/46C21D8/0226C21D8/0236C21D8/0263C21D8/0278C21D2211/002C21D2211/005C21D2211/008C22C38/001C22C38/002C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/28C22C38/32C23C2/024C23C2/02C23C2/0224C23C2/40C23F17/00C25D5/36
Inventor 冈本力川田裕之东昌史上西朗弘丸山直纪
Owner NIPPON STEEL CORP
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