Invention Grant
- Patent Title: Steel material for hot stamping, hot stamping process and hot stamped component
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Application No.: US16316257Application Date: 2016-09-08
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Publication No.: US11377703B2Publication Date: 2022-07-05
- Inventor: Hongliang Yi , Hongliang Liu , Zhiyuan Chang , Di Wu , Jian Huang , Guodong Wang
- Applicant: Northeastern University , Bengang Steel Plates Co., Ltd.
- Applicant Address: CN Liaoning; CN Liaoning
- Assignee: Northeastern University,Bengang Steel Plates Co., Ltd.
- Current Assignee: Northeastern University,Bengang Steel Plates Co., Ltd.
- Current Assignee Address: CN Liaoning; CN Liaoning
- Agency: Fitch, Even, Tabin & Flannery, LLP
- Priority: CN201610535069.3 20160708
- International Application: PCT/CN2016/098411 WO 20160908
- International Announcement: WO2018/006490 WO 20180111
- Main IPC: C21D8/04
- IPC: C21D8/04 ; C22C38/04 ; C22C38/24 ; C22C38/26 ; C22C38/28 ; C22C38/32 ; C22C38/38 ; C22C38/46 ; C21D8/00 ; C22C38/00

Abstract:
The present invention relates to a steel material for hot stamping with ultra-fine grains and a process of making the same, a hot stamping process and a hot stamped component. The steel material for hot stamping comprises the following components by weight: 0.27 to 0.40% of C; 0.2 to 3.0% of Mn; 0.11 to 0.4% of V; 0 to 0.8% of Si; 0 to 0.5% of Al; 0 to 2% of Cr; 0 to 0.15% of Ti; 0 to 0.15% of Nb; 0 to 0.004% B; a total of less than 2% of Mo, Ni, Cu and other alloying elements that are beneficial to improving the hardenability, and other impurity elements. After hot stamping or equivalent heat treatment, the steel material or the formed component of the present invention can achieve a yield strength of 1300 MPa to 1700 MPa, a tensile strength of 1800 to 2200 MPa, and an elongation of 6 to 9% after direct hot stamping quenching and without tempering, which properties cannot be achieved by a material with a composition in the prior art in the situation of direct quenching (no tempering). After the tempering treatment of the present invention, preferably 1500 MPa-1900 MPa-8%, and 1600 MPa-2100 MPa-7% can be reached.
Public/Granted literature
- US20190309385A1 Steel Material For Hot Stamp Forming, Hot Stamp Forming Process And Hot Stamp Formed Member Public/Granted day:2019-10-10
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