Title:
HIGH-STRENGTH LOW-CARBON MARTENSITIC HIGH HOLE EXPANSION STEEL AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/042730
Kind Code:
A1
Abstract:
A low-carbon martensitic high hole expansion steel with a tensile strength above 980 MPa, and a manufacturing method therefor, the weight percentage of the chemical components thereof being: C 0.03-0.10%, Si 0.5-2.0%, Mn 1.0-2.0%, P≤0.02%, S≤0.003%, Al 0.02-0.08%, N≤0.004%, Mo 0.1-0.5%, Ti 0.01-0.05%, and O≤0.0030%, and the remainder being Fe and other inevitable impurities. The high hole expansion steel of the present invention has a yield strength of ≥800 MPa and tensile strength of ≥980 MPa, a lateral extension rate A50≥8%, and a hole expansion rate of ≥30%, passes cold bending performance tests (d≤4a, 180°), and can be used for passenger car chassis parts that require high strength and thinning such as control arms and sub-frames.
More Like This:
Inventors:
WANG HUANRONG (CN)
YANG FENG (CN)
ZHANG CHEN (CN)
YANG ANA (CN)
NI YAPING (CN)
WANG MING (CN)
BAI MINGZHUO (CN)
YANG FENG (CN)
ZHANG CHEN (CN)
YANG ANA (CN)
NI YAPING (CN)
WANG MING (CN)
BAI MINGZHUO (CN)
Application Number:
PCT/CN2021/115431
Publication Date:
March 03, 2022
Filing Date:
August 30, 2021
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/02; C21D8/02; C22C33/04; C22C38/04; C22C38/06; C22C38/12; C22C38/14; C22C38/34; C22C38/42; C22C38/44; C22C38/46; C22C38/48; C22C38/50; C22C38/54; C22C38/58
Foreign References:
| CN110088326A | 2019-08-02 | |||
| CN106471147A | 2017-03-01 | |||
| CN111235470A | 2020-06-05 | |||
| US20200010921A1 | 2020-01-09 | |||
| CN106119702A | 2016-11-16 |
Other References:
See also references of EP 4206350A4
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
Download PDF: