Invention Grant
- Patent Title: High-strength hot-dip galvannealed steel sheet and method for producing same
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Application No.: US17491639Application Date: 2021-10-01
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Publication No.: US11643702B2Publication Date: 2023-05-09
- Inventor: Satoshi Maeda , Yoshiyasu Kawasaki , Yusuke Fushiwaki , Mai Aoyama
- Applicant: JFE Steel Corporation
- Applicant Address: JP Tokyo
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: RatnerPrestia
- Priority: JP 2018063321 2018.03.28
- The original application number of the division: US17041567
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C21D8/02 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/08 ; C22C38/12 ; C22C38/14 ; C22C38/16 ; C22C38/32 ; C22C38/60 ; C23C2/06 ; C23C2/28 ; C23C2/40 ; C21D6/00
Abstract:
A method for producing a high-strength hot-dip galvannealed steel sheet, in which a high-strength steel sheet is used as a base material, includes a rolling step (x) of rolling a hot-dip galvannealed steel sheet with a coating layer having an Fe concentration of 8% to 17% by mass, and a heat treatment step (y) of heating the coated steel sheet which has been subjected to the rolling step (x) under the conditions satisfying the following formulae (1) and (2):
(273+T)×(20+2×log10(t))≥8000 (1)
40≤T≤160 (2)
where T: heating temperature (° C.) of the coated steel sheet, and t: holding time (hr) at the heating temperature T.
(273+T)×(20+2×log10(t))≥8000 (1)
40≤T≤160 (2)
where T: heating temperature (° C.) of the coated steel sheet, and t: holding time (hr) at the heating temperature T.
Public/Granted literature
- US20220017986A1 HIGH-STRENGTH HOT-DIP GALVANNEALED STEEL SHEET AND METHOD FOR PRODUCING SAME Public/Granted day:2022-01-20
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