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High-strength steel plate and manufacturing method thereof

A high-strength steel plate and manufacturing method technology, applied in the direction of manufacturing tools, chemical instruments and methods, furnaces, etc., can solve the problems of unimproved bendability, and achieve the effect of excellent bending characteristics and excellent ductility balance

Active Publication Date: 2021-12-24
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] However, although the Mn segregation in the surface layer is moderated, it is clear that the bendability is not improved

Method used

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  • High-strength steel plate and manufacturing method thereof
  • High-strength steel plate and manufacturing method thereof
  • High-strength steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0201] The steel sheet of the present invention will be more specifically described below with reference to the example. However, the following example is an example of a steel sheet of the present invention, and the steel sheet of the present invention is not limited to the example of the following example.

[0202] 1. Evaluation of steel sheet manufacturing

[0203] The method of manufacturing the multilayer steel sheet described in Table 2 is made in accordance with the method of the coating method. For a continuous casting slab having a chemical composition shown in Table 1 and a plate thickness of 20 mm (steel sheet for the plate thickness center portion), after the surface oxide is removed, the arc welding is laminated in its single-sided or both sides. A steel sheet (surface layer softening portion) of the chemical composition shown in Table 1. At the heating temperature, the holding time of hot rolling, the heat rolling start temperature, the cooling end time, the cooling ...

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PUM

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Abstract

The present invention provides a bendable high-strength steel sheet containing a large amount of Mn, which is preferable as a raw material for automobile parts, and a method for producing the same. The above-mentioned high-strength steel sheet is characterized in that it is a high-strength steel sheet with excellent bendability including a thick central portion and a softened surface portion formed on one or both sides of the thick central portion, and the thick central portion The average Mn concentration is more than 4.0% by mass and less than 10.0% by mass, each surface softened portion has a thickness of 0.1% to 30% of the plate thickness, the Mn concentration of the surface layer softened portion is 2.5% by mass or less, and the surface layer softened portion The recrystallization rate is above 90%.

Description

Technical field [0001] The present invention relates to high-strength steel sheets having excellent bending and Mn contain high concentrations and a manufacturing method thereof. Background technique [0002] In order to realize the light quantization and safety of the car body and the components, these raw materials are high-strength. Generally, if the steel plate is high, the stretch is lowered, thereby damaging the formability of the steel sheet. Therefore, as the automotive member, it is necessary to improve the intensity and formability of the opposite characteristics in order to use a high strength steel sheet. [0003] In order to increase the stretching, so far, the so-called TRIP steel (for example, Patent Document 1) is proposed (for example, Patent Document 1). [0004] Further, as a steel sheet having a residual austenithum is more than the above TRIP steel, it is proposed to add steel plates having more than 4.0% Mn (for example, Non-Patent Document 1). Since the abo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D9/00C21D9/46C22C38/06C22C38/60
CPCC21D9/46C22C38/06B32B15/011C22C38/001C22C38/02C22C38/04C21D8/0226C21D8/0236C21D8/0273C22C38/60C22C38/42C22C38/44C21D8/0205
Inventor 薮翔平林宏太郎虻川玄纪上西朗弘
Owner NIPPON STEEL CORP