Invention Grant
- Patent Title: High strength steel sheet
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Application No.: US16487030Application Date: 2018-02-20
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Publication No.: US11261505B2Publication Date: 2022-03-01
- Inventor: Katsuya Nakano , Yuya Suzuki , Genki Abukawa , Kunio Hayashi
- Applicant: NIPPON STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL CORPORATION
- Current Assignee: NIPPON STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JPJP2017-029327 20170220,JPJP2017-029329 20170220
- International Application: PCT/JP2018/006084 WO 20180220
- International Announcement: WO2018/151331 WO 20180823
- Main IPC: B32B15/01
- IPC: B32B15/01 ; C23C2/06 ; C23C2/40 ; C23C2/28 ; C22C38/38 ; C22C38/32 ; C22C38/22 ; C22C38/16 ; C22C38/14 ; C22C38/12 ; C22C38/08 ; C22C38/06 ; C22C38/04 ; C22C38/02 ; C22C38/00 ; C21D6/00 ; C21D8/02 ; C21D9/46 ; C22C38/60 ; C22C38/34 ; B32B15/04 ; C22C38/42 ; C22C38/18 ; C22C38/26 ; C22C38/40 ; B32B15/18 ; C22C38/46 ; C22C38/24 ; C22C38/44 ; C22C38/20 ; C22C38/48 ; C22C38/28 ; C22C38/58 ; C22C38/50 ; C25D3/22 ; C23C30/00
Abstract:
High strength steel sheet having a tensile strength of 800 MPa or more comprising a middle part in sheet thickness and a soft surface layer arranged at one side or both sides of the middle part in sheet thickness, wherein each soft surface layer has a thickness of more than 10 μm and 30% or less of the sheet thickness, the soft surface layer has an average Vickers hardness of 0.60 time or less the average Vickers hardness of the sheet thickness ½ position, and the soft surface layer has a nano-hardness standard deviation of 0.8 or less is provided.
Public/Granted literature
- US20200232060A1 HIGH STRENGTH STEEL SHEET Public/Granted day:2020-07-23
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