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Steel sheet, coated steel sheet, and method for manufacturing hot-rolled steel sheet, method for manufacturing cold-rolled full-hard steel sheet, method for manufacturing thin steel sheet, and method for manufacturing coated steel sheet

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

Active Publication Date: 2020-11-03
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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  • Steel sheet, coated steel sheet, and method for manufacturing hot-rolled steel sheet, method for manufacturing cold-rolled full-hard steel sheet, method for manufacturing thin steel sheet, and method for manufacturing coated steel sheet
  • Steel sheet, coated steel sheet, and method for manufacturing hot-rolled steel sheet, method for manufacturing cold-rolled full-hard steel sheet, method for manufacturing thin steel sheet, and method for manufacturing coated steel sheet
  • Steel sheet, coated steel sheet, and method for manufacturing hot-rolled steel sheet, method for manufacturing cold-rolled full-hard steel sheet, method for manufacturing thin steel sheet, and method for manufacturing coated 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

The present invention provides a method for manufacturing thin steel sheets, plated steel sheets, hot-rolled steel sheets, cold-rolled full-hard steel sheets, and thin steel sheets having a TS of 980 MPa or more and excellent bendability and platability. It has a predetermined composition and contains at least one selected from Ti: 0.003 to 0.100%, Nb: 0.003 to 0.100%, and Mo: 0.005 to 0.500%. In the range of 20 μm from the surface in the thickness direction, the polygonal ferrite is 0 to 80%, and the sum of martensite, bainite and retained austenite is 20 to 100%. The amount of Mn in the martensite existing in the range of 20 μm in the direction: [Mn] SM With the amount of Mn in the body: [Mn] B meet [Mn] SM / [Mn] B ≤1.5, at the position 300 μm away from the surface in the thickness direction, the martensite is 20-50%.

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 Patents(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/14C22C38/60
CPCC22C38/14C22C38/60C21D8/0226C21D8/0236C21D8/0263C21D8/0273C23C2/00C23C2/06C23C2/40C22C38/001C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/22C22C38/26C22C38/38C23C2/12C21D9/46B32B15/013C21D6/002C21D6/005C21D6/008C21D8/0205C21D8/0278C21D2211/001C21D2211/002C21D2211/008C22C38/002C22C38/16C23C2/024C23C2/022C23C2/28C23C2/0224
Inventor 长谷川宽船川义正
Owner JFE STEEL CORP
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