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Steel plate and manufacturing method thereof

A steel plate, high-quality technology, applied to the steel plate with high Mn concentration and its manufacturing field, can solve the problems of poor uniform tensile properties, high Mn concentration, and inability to have both tensile strength and formability

Active Publication Date: 2021-09-14
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the steel sheet described in Patent Document 2 contains a large amount of unrecrystallized ferrite due to its high Mn concentration, it is not work-hardened, such as figure 1 As shown in the prior art, uniform tensile properties are poor
That is, a steel sheet with a high Mn concentration having such a ferrite-containing structure cannot satisfy both the tensile strength and formability required for steel sheets for automobiles.

Method used

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  • Steel plate and manufacturing method thereof
  • Steel plate and manufacturing method thereof
  • Steel plate and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment

[0207] The steel plate of this application is demonstrated more concretely with reference to an example. However, the following examples are examples of the steel sheet of the present application and its manufacturing method, and the steel sheet of the present application and its manufacturing method are not limited to the aspects of the following examples.

[0208] 1. Manufacture of steel plates for evaluation

[0209] 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.

[0210] [Table 1]

[0211]

[0212] The obtained slab was hot-rolled under the conditions shown in Table 2 to produce a 2.6mm thick hot-rolled steel sheet, and then, the obtained hot-rolled steel sheet was pickled and cold-rolled to produce a 1.2mm thick of cold-rolled steel plates.

[0213] [table 2-1]

[0214]

[0215] [Table 2-2]

[0216]

[0217] The obtained cold-rolled steel sheets were subjecte...

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Abstract

The present invention provides a high Mn-containing steel sheet having excellent uniform tensile properties and high strength. The steel sheet is characterized by containing C: more than 0.10% to less than 0.55%, Si: more than 0.001% to less than 3.50%, Mn: more than 4.00% to less than 9.00%, and sol.Al: more than 0.001% in mass % And less than 3.00%, the rest is composed of iron and unavoidable impurities, wherein, in the L section, the metal structure at the position of 1 / 4 of the thickness from the surface contains 25% to 90% of tempering in terms of area % Martensite, less than 3% ferrite, 10% to 75% retained austenite and less than 5% bainite.

Description

technical field [0001] The present application relates to a steel sheet having excellent formability and a manufacturing method thereof, and more specifically to a steel sheet having a high Mn concentration having excellent uniform tensile properties and high strength and a manufacturing method thereof. Background technique [0002] In order to achieve both weight reduction and safety of automobile bodies and components, the strength of steel sheets, which are their raw materials, has been increasing. In general, when the strength of a steel sheet is increased, the elongation decreases and the formability of the steel sheet is impaired. Therefore, in order to use a high-strength steel sheet as a member for automobiles, it is necessary to improve both strength and formability, which are opposite characteristics. [0003] In order to increase the elongation, so-called TRIP steels utilizing the transformation plasticity of retained austenite (retained γ) have been proposed (fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C38/06C22C38/60C21D9/46C21D9/52
CPCC22C38/06C22C38/60C21D6/008C21D6/005C21D6/001C21D6/002C22C38/02C21D9/48C22C38/04C22C38/08C22C38/14C22C38/16C22C38/22C22C38/008C22C38/005C22C38/12C21D2211/001C21D2211/008C21D8/0426C21D8/0436C21D8/0447C21D1/18C21D1/26C21D1/19C22C38/38C23C2/28C23C2/40C21D9/46C21D9/52B32B15/01C21D8/0205C21D8/0247C21D2211/002C21D2211/003C21D2211/005C22C38/001C22C38/002
Inventor 林宏太郎海藤宏志冈本力上西朗弘
Owner NIPPON STEEL CORP
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