Title:
HIGH-PLASTICITY 1500-MPA-GRADE ULTRAHIGH-STRENGTH STEEL AND PREPARATION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2024/001990
Kind Code:
A1
Abstract:
High-plasticity 1500-MPa-grade ultrahigh-strength steel and a manufacturing method therefor. The steel comprises the following components in percentages by weight: 0.35-0.40% of C, 1.0-1.8% of Si, 1.5-2.0% of Mn, 0.3-0.6% of Cr, 0.02-0.05% of Al, 0.02-0.05% of Ti, and 0.002-0.02% of B, with the balance being Fe and other inevitable impurities. Moreover, the steel also satisfies: the carbon equivalent Ceq1 of a peritectic reaction zone is greater than 0.17%, and Ceq1=C-0.03Mn-0.06Si-0.222S-0.04P; and the carbon equivalent Ceq2 for welding is smaller than or equal to 0.56%, and Ceq2=C+Mn/20+Si/30+2P+4S. The ultrahigh-strength steel of the present invention has a yield strength of 1000-1300 MPa, a tensile strength of greater than or equal to 1500 MPa, and an elongation at break of greater than or equal to 18%, has a good surface quality, and is particularly suitable for manufacturing structural members and safety members of vehicles with complex shapes and high requirements for a forming performance, such as A/B pillars, side impact beams, longitudinal beams, and bumpers.
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Inventors:
CHEN MENGXIAO (CN)
ZHONG YONG (CN)
WANG LI (CN)
ZHONG YONG (CN)
WANG LI (CN)
Application Number:
PCT/CN2023/102330
Publication Date:
January 04, 2024
Filing Date:
June 26, 2023
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/02; C21D1/26; C21D1/74; C21D8/02; C22C33/04; C22C38/06; C22C38/28; C22C38/32; C22C38/34
Foreign References:
| CN101270449A | 2008-09-24 | |||
| CN108018484A | 2018-05-11 | |||
| CN106086684A | 2016-11-09 | |||
| CN113388779A | 2021-09-14 | |||
| JPH0525583A | 1993-02-02 |
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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