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Steel sheet, method for manufacturing same and plated steel sheet

A manufacturing method and steel plate technology, applied in the direction of manufacturing tools, coatings, hot-dip galvanizing, etc., can solve the problems of impact resistance, low temperature toughness, etc.

Active Publication Date: 2021-09-10
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in Patent Document 5, low-temperature toughness required for impact resistance is not considered.

Method used

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  • Steel sheet, method for manufacturing same and plated steel sheet
  • Steel sheet, method for manufacturing same and plated steel sheet
  • Steel sheet, method for manufacturing same and plated steel sheet

Examples

Experimental program
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Embodiment

[0240] Next, the effect of one mode of the present invention will be described more specifically through an example, but the conditions in the example are an example of conditions adopted to confirm the practicability and effect of the present invention, and the present invention is not limited to this one. Condition example. The present invention can adopt various conditions as long as the object of the present invention can be achieved without departing from the gist of the present invention.

[0241] After melting and casting steels having the chemical compositions shown in Table 1, steel billets with a thickness of 30 to 40 mm were produced by hot forging. The obtained slab was heated, and the test was carried out in any temperature range between FT+50°C and FT+150°C or FT to FT+50°C using a small tandem rolling mill for testing. A steel sheet is obtained by carrying out hot rolling by rolling multiple times of 2 to 4 passes to a plate thickness of 2.5 to 3.5 mm, and ...

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Abstract

This steel sheet uses a steel sheet which has a specific chemical composition and a tensile strength of at least 780 MPa, and in which the average grain size at a depth position of 1 / 4 of the sheet thickness from the surface thereof is 15.0 (mu)m, the total grain boundary density of a solid solution C and a solid solution B is 1.0 / nm2 to 12.0 / nm2, and the total pole density of {211}<011> and {332}<113> of a central part in the sheet thickness direction is at most 12.0.

Description

technical field [0001] The present invention relates to a steel plate, a method for manufacturing the steel plate, and a coated steel plate. More specifically, the present invention relates to a steel sheet having excellent workability, a method for producing the steel sheet, and a coated steel sheet suitable as a raw material for use in applications such as automobiles, home appliances, machine structures, and construction. [0002] This application claims priority based on Patent Application No. 2019-059420 filed in Japan on March 26, 2019, the contents of which are incorporated herein by reference. Background technique [0003] Steel sheets supplied as raw materials for transportation machinery such as automobiles and structural members of various industrial machinery require a variety of properties such as strength, elongation, and workability such as hemming properties, low-temperature toughness, and uniformity of these properties. characteristic. [0004] In particul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/46C22C38/58C22C38/00
CPCC21D9/46C23C2/06C23C2/40C23C2/02C21D1/25C21D8/0226C21D8/0263C21D2211/002C21D2211/008C21D2211/005C21D6/008C22C38/02C22C38/04C22C38/14C22C38/06C22C38/001C22C38/002C22C38/12C22C38/22C22C38/38C22C38/005C22C38/16C22C38/08C21D1/18B32B15/013C23C2/0224C22C38/58C22C38/46C22C38/48C22C38/44C22C38/50C22C38/42C21D2211/001C21D2211/009C22C38/54
Inventor 吉田充小岛启达
Owner NIPPON STEEL CORP
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