Invention Grant
- Patent Title: Alloyed hot-dip galvanized steel sheet and alloyed hot-dip galvanized steel sheet production method
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Application No.: US17040348Application Date: 2019-03-12
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Publication No.: US11408047B2Publication Date: 2022-08-09
- Inventor: Tetsuji Hoshika , Muneaki Ikeda , Michiharu Nakaya
- Applicant: Kobe Steel, Ltd.
- Applicant Address: JP Kobe
- Assignee: Kobe Steel, Ltd.
- Current Assignee: Kobe Steel, Ltd.
- Current Assignee Address: JP Kobe
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JPJP2018-062586 20180328,JPJP2019-027330 20190219
- International Application: PCT/JP2019/009880 WO 20190312
- International Announcement: WO2019/188235 WO 20191003
- Main IPC: C23C2/02
- IPC: C23C2/02 ; C23C2/06 ; C23C2/40 ; C22C38/38 ; C22C38/32 ; C22C38/28 ; C22C38/22 ; C22C38/06 ; C22C38/02 ; C22C38/00 ; B32B15/01 ; C21D9/46 ; C21D8/02 ; C21D6/00 ; C23G1/08 ; C23C2/28 ; C22C38/60 ; C22C38/12 ; B32B15/04 ; C23C30/00 ; C22C38/18 ; C22C38/04 ; C22C38/14 ; C21D8/00 ; B32B15/18
Abstract:
In one aspect of the present invention, a hot-dip galvannealed steel sheet includes a steel sheet and a hot-dip galvannealed layer on the surface of the steel sheet. The steel sheet has a predetermined composition and has an average oxygen concentration of 0.10 mass % or less in the region of 1 μm from the interface between the steel sheet and the hot-dip galvannealed layer toward the steel sheet. The metal microstructure of the steel sheet at a position of t/4 where t represents the sheet thickness of the hot-dip galvannealed steel sheet includes 50 to 85 area % of martensite, 15 to 50 area % of bainite, and 5 area % or less of ferrite.
Public/Granted literature
- US20210017621A1 ALLOYED HOT-DIP GALVANIZED STEEL SHEET AND ALLOYED HOT-DIP GALVANIZED STEEL SHEET PRODUCTION METHOD Public/Granted day:2021-01-21
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