Thin steel sheet, plated steel sheet, method for producing hot-rolled steel sheet, method for producing cold-rolled full-hard steel sheet, method for producing thin steel sheet, and method for producing plated steel sheet

A manufacturing method and technology for hot-rolled steel sheets, applied in chemical instruments and methods, manufacturing tools, heat treatment furnaces, etc., can solve problems such as reduced workability, and achieve the effects of excellent platability, improved collision safety, and improved fuel efficiency

Active Publication Date: 2018-12-21
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, strengthening of the material usually results in a reduction in processability

Method used

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  • Thin steel sheet, plated steel sheet, method for producing hot-rolled steel sheet, method for producing cold-rolled full-hard steel sheet, method for producing thin steel sheet, and method for producing plated steel sheet
  • Thin steel sheet, plated steel sheet, method for producing hot-rolled steel sheet, method for producing cold-rolled full-hard steel sheet, method for producing thin steel sheet, and method for producing plated steel sheet
  • Thin steel sheet, plated steel sheet, method for producing hot-rolled steel sheet, method for producing cold-rolled full-hard steel sheet, method for producing thin steel sheet, and method for producing plated steel sheet

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Embodiment 1

[0149] Hereinafter, the present invention will be specifically described based on examples. The technical scope of the present invention is not limited to the following examples.

[0150]Steel with the composition shown in Table 1 (the balance being Fe and unavoidable impurities) was melted in a vacuum melting furnace in a laboratory, and rolled to form a billet. These billets were heated to 1200° C., rough-rolled, and then hot-rolled under the conditions shown in Table 2 to obtain hot-rolled steel sheets (HR). Next, a part was cold-rolled to 1.4 mm to make a cold-rolled full-hard steel sheet (CR). The obtained hot-rolled steel sheets and cold-rolled full-hard steel sheets were subjected to annealing. Next, a galvanizing treatment and, if necessary, a galvanizing treatment are performed to produce a galvanized steel sheet (GI) and a galvanized steel sheet (GA). Annealing was carried out in the laboratory under the conditions shown in Table 2 using a heat treatment and plati...

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Abstract

Provided herein are a steel sheet and a plated steel sheet having a TS of 980 MPa or more and excellent bendability and plating capabilities, a method for producing a hot-rolled steel sheet, a methodfor producing a cold-rolled full hard steel sheet, and a method for producing a steel sheet. The steel sheet includes predetermined compositions, and includes at least one selected from 0.003-0.100% of Ti, 0.003-0.100% of Nb, and 0.005-0.500% of Mo. Polygonal ferrite is 0-80%, and a total of martensite, bainite, and residual austenite is 20-100% in terms of an area ratio in a range of 20 [mu]m ina sheet thickness direction from a steel sheet surface. The content of Mn in martensite present in the range of 20 [mu]m in the sheet thickness direction from the steel sheet surface ([Mn]SM) and thecontent of Mn in a bulk ([Mn]B) satisfies [Mn]SM / [Mn]B <= 1.5, and the martensite has an area ratio of 20-50% at a position 300 [mu]m in the sheet thickness direction from the steel sheet surface.

Description

technical field [0001] The present invention relates to a thin steel sheet, a coated steel sheet, a method for manufacturing a hot-rolled steel sheet, a method for manufacturing a cold-rolled full-hard steel sheet, a method for manufacturing a thin steel sheet, and a method for manufacturing a coated steel sheet. Background technique [0002] From the viewpoint of improving the crash safety of automobiles and improving fuel efficiency, higher strength is required for steel sheets used in automobile parts. However, strengthening of the material usually results in a decrease in processability. Therefore, it is necessary to develop a steel sheet excellent in both strength and workability. In particular, high-strength steel sheets with a tensile strength (hereinafter also referred to as TS) of more than 980 MPa are difficult to form. Therefore, the bending body is often processed in a rigid shape such as beams and edge beam parts, and excellent bendability is required. steel p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/14C22C38/60
CPCC22C38/14C22C38/60C21D8/0226C21D8/0236C21D8/0263C21D8/0273C23C2/00C23C2/06C23C2/40C22C38/001C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/22C22C38/26C22C38/38C23C2/12C21D9/46B32B15/013C21D6/002C21D6/005C21D6/008C21D8/0205C21D8/0278C21D2211/001C21D2211/002C21D2211/008C22C38/002C22C38/16C23C2/024C23C2/022C23C2/28
Inventor 长谷川宽船川义正
Owner JFE STEEL CORP
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