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steel plate

A steel plate and quality technology, applied in the field of steel plates containing high Mn concentration, can solve the problems of limited use of structural members, difficulty in fully ensuring weldability, etc., and achieve the effects of excellent high strength and excellent local ductility.

Active Publication Date: 2021-12-31
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the steel plate is used as a structural member, the steel plate is often welded, but if the C content in the steel plate is large, it becomes difficult to ensure sufficient weldability, and the use as a structural member is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0191] The steel plate of this application is demonstrated more concretely with reference to an example. However, the following examples are examples of the steel sheets of the present application, and the steel sheets of the present application are not limited to the aspects of the following examples.

[0192] 1. Manufacture of steel plates for evaluation

[0193] Steels having the chemical compositions shown in Table 1 were melted in a converter and continuously cast to obtain slabs with a thickness of 245 mm.

[0194] Table 1

[0195]

[0196] The down arrow in Table 1 means the same as the previous column.

[0197]The obtained slabs were hot-rolled under the conditions shown in Table 2 to produce hot-rolled steel sheets with a thickness of 2.6 mm. Next, the obtained hot-rolled steel sheets were pickled and cold-rolled at the cold-rolling ratios shown in Table 2 to produce cold-rolled steel sheets with various thicknesses shown in Table 2.

[0198] Table 2

[0199] ...

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Abstract

The present invention provides a steel sheet containing a high concentration of Mn having excellent local ductility and high strength. The steel plate is characterized in that it contains predetermined amounts of C, Si, and sol.Al, and Mn exceeding 4% and less than 9% by mass%, limits the content of P, S, N, and O, and contains arbitrarily selected elements. , the remaining part is iron and impurities; the metal structure in the 1 / 4t part of the L section contains 25% to 90% of tempered martensite, 3% or less ferrite, 10% to 50% of Retained austenite and 25% or less of primary martensite, as either the retained austenite or the primary martensite, that is, the first region, and the first region is removed from the metal structure at the 1 / 4 position The interface density, which is the value obtained by dividing the sum of the lengths of the boundaries of the second region other than the region by the total area of ​​the first region and the second region, is 2.7 μm ‑1 above.

Description

technical field [0001] The present application relates to a steel sheet having excellent formability and ultra-high strength characteristics, and specifically, to a steel sheet containing a high concentration of Mn having excellent local ductility and high tensile strength. Background technique [0002] In order to achieve both weight reduction and safety of automobile bodies and components, the strengthening of steel sheets, which are their raw materials, is progressing. In general, if the strength of the steel sheet is increased, the elongation decreases and the formability of the steel sheet is impaired. Since automobile body parts using steel sheets as raw materials are often formed by press working, high-strength steel sheets used as vehicle body parts are required to have excellent press formability. In particular, a member for a vehicle body mainly composed of stretch flange forming or hole expansion requires high strength and high local ductility as mechanical prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/60
CPCC22C38/00C21D9/46C22C38/60Y02P10/20
Inventor 海藤宏志林宏太郎
Owner NIPPON STEEL CORP
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