Invention Application
- Patent Title: TWO-STEP HOT FORMING OF STEELS
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Application No.: US15417921Application Date: 2017-01-27
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Publication No.: US20180216205A1Publication Date: 2018-08-02
- Inventor: Jianfeng Wang , Qi Lu , Anil K. Sachdev
- Applicant: GM Global Technology Operations LLC
- Main IPC: C21D9/00
- IPC: C21D9/00 ; C23C2/06 ; C23C2/40 ; C23C2/28 ; C22C38/04 ; C21D8/00 ; C21D1/18 ; B21D22/02

Abstract:
Methods for press hardening steel alloys comprised of medium-Mn are provided. The press-hardened steel alloy may have an ultimate tensile strength (UTS) of at least 1,700 MPa and a tensile elongation of at least 8%. The press-hardened steel alloy may be formed in two forming steps above the martensitic finish temperature. The press-hardened steel may have a microstructure comprising martensite at greater than or equal to about 80% to less than or equal to about 98% and retained austenite at less than or equal to about 20% to greater than or equal to about 2%.
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