Invention Grant
- Patent Title: Low-cost and high-formability 1180 MPa grade cold-rolled annealed dual-phase steel plate and manufacturing method thereof
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Application No.: US16624270Application Date: 2018-06-26
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Publication No.: US11339451B2Publication Date: 2022-05-24
- Inventor: Peng Xue , Xiaodong Zhu , Wei Li
- Applicant: BAOSHAN IRON & STEEL CO., LTD.
- Applicant Address: CN Shanghai
- Assignee: BAOSHAN IRON & STEEL CO., LTD.
- Current Assignee: BAOSHAN IRON & STEEL CO., LTD.
- Current Assignee Address: CN Shanghai
- Agency: Procopio, Cory, Hargreaves & Savitch LLP
- Priority: CN201710520183.3 20170630
- International Application: PCT/CN2018/092876 WO 20180626
- International Announcement: WO2019/001423 WO 20190103
- Main IPC: C21D9/00
- IPC: C21D9/00 ; C22C38/04 ; C21D8/02 ; C22C38/02 ; C22C38/06 ; C22C38/12 ; C22C38/14

Abstract:
A low-cost and high-formability 1180 MPa grade cold-rolled annealed dual-phase steel plate and a manufacturing method thereof are provided. The dual-phase steel plate has the following chemical composition by mass percentages: C: 0.1%-0.125%, Si: 0.4%-0.8%, Mn: 2.6%-2.9%, Al: 0.01%-0.05%, Nb: 0.01%-0.03%, and Ti: 0.01%-0.03%, the remainder being Fe and unavoidable impurities. By reasonable design of alloy elements and manufacturing processes, the dual-phase steel plate of the invention achieves a strength of 1180 MPa grade at a low cost, obtains a fine and uniform martensite-ferrite dual-phase structure that ensures excellent elongation rate and cold bending performance, and has good formability. The dual-phase steel plate has a yield strength of more than 850 MPa, a tensile strength of more than 1180 MPa, an elongation rate of 8% or more, and a parameter (R/t), characterizing the 90-degree cold bending performance, of 2.5 or less.
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