- 专利标题： HIGH-STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR
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申请号： EP19878653.5申请日： 2019-09-25
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公开(公告)号： EP3875623A1公开(公告)日： 2021-09-08
- 发明人: HIRASHIMA Takuya , YOSHIOKA Shimpei , KANEKO Shinjiro
- 申请人： JFE Steel Corporation
- 申请人地址： JP Tokyo 100-0011 2-3, Uchisaiwai-cho 2-chome Chiyoda-ku
- 代理机构： Grünecker Patent- und Rechtsanwälte PartG mbB
- 优先权： JP2018204876 20181031
- 国际公布： WO2020090303 20200507
- 主分类号： C22C38/00
- IPC分类号： C22C38/00 ; C21D9/46 ; C22C38/60
摘要：
An object of the present invention is to provide a high-strength steel sheet having high delayed fracture resistance and a method for manufacturing the high-strength steel sheet.
A high-strength steel sheet according to the present invention has a predetermined element composition. Relative to the whole microstructure of the steel sheet, the total area fraction of one or two of bainite containing carbide grains having an average grain size of 50 nm or less and martensite containing carbide grains having an average grain size of 50 nm or less is 90% or more. The average number of inclusions having an average grain size of 5 µm or more that are present in a section perpendicular to a rolling direction is 5.0/mm 2 or less.
A high-strength steel sheet according to the present invention has a predetermined element composition. Relative to the whole microstructure of the steel sheet, the total area fraction of one or two of bainite containing carbide grains having an average grain size of 50 nm or less and martensite containing carbide grains having an average grain size of 50 nm or less is 90% or more. The average number of inclusions having an average grain size of 5 µm or more that are present in a section perpendicular to a rolling direction is 5.0/mm 2 or less.
公开/授权文献
- EP3875623B1 HIGH-STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR 公开/授权日：2023-12-13
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