Title:
LOW-YIELD-RATIO MARINE-GRADE STEEL HAVING YIELD STRENGTH GREATER THAN OR EQUAL TO 750 MPA AND PRODUCTION PROCESS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2024/082997
Kind Code:
A1
Abstract:
A low-yield-ratio marine-grade steel having yield strength greater than or equal to 750 MPa and a production process therefor. The steel plate comprises the following chemical components: 0.06%-0.10% of C, 0.1%-0.2% of Si, 0.60%-1.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.62%-1.20% of Cu, 0.20%-0.50% of Cr, 0.50%-1.20% of Ni, 0.30%-0.70% of Mo, less than or equal to 0.06% of Nb, 0.02%-0.05% of V, less than or equal to 0.02% of Ti, and less than or equal to 0.04% of Al, with the balance being Fe and impurities. By using Cu, Mo, Nb, V, and Ti in combination for strengthening and adjusting controlled rolling and cooling parameters, the steel plate has a microstructure which is a mixed structure of martensite-bainite-nanoscale precipitates, so that the steel plate has a high strain strengthening capacity and a low yield ratio, and has good weldability. The use of TMCP technology achieves low production costs and high efficiency.
Inventors:
LI TIANYI (CN)
LIU WENYUE (CN)
WANG CHAOYI (CN)
WANG CHUANJUN (CN)
AN TAO (CN)
ZANG YAN (CN)
GENG ZHIYU (CN)
LIU WENYUE (CN)
WANG CHAOYI (CN)
WANG CHUANJUN (CN)
AN TAO (CN)
ZANG YAN (CN)
GENG ZHIYU (CN)
Application Number:
PCT/CN2023/123725
Publication Date:
April 25, 2024
Filing Date:
October 10, 2023
Export Citation:
Assignee:
ANSTEEL BEIJING RES INSTITUTE CO LTD (CN)
International Classes:
C22C38/02; C21D8/02
Foreign References:
| CN115558863A | 2023-01-03 | |||
| JPH10265846A | 1998-10-06 | |||
| US20200347478A1 | 2020-11-05 | |||
| JPH05255743A | 1993-10-05 | |||
| KR100833076B1 | 2008-05-27 | |||
| KR20090066639A | 2009-06-24 | |||
| CN114000056A | 2022-02-01 |
Attorney, Agent or Firm:
ANSHAN JIA XUN TECHNOLOGY PATENT OFFICE (GENERAL PARTNERSHIP) (CN)
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