Title:
1,300-MPA-GRADE OR MORE COLD-ROLLED STEEL PLATE HAVING HIGH EXTENSION AND HIGH HOLE-EXPANSION PERFORMANCE AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/246798
Kind Code:
A1
Abstract:
Disclosed in the present invention is a 1,300-MPa-grade or more cold-rolled steel plate having high extension and high hole-expansion performance and a manufacturing method therefor. The cold-rolled steel plate contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: C: 0.15%-0.30%; Si: 0.3%-0.5%; Mn: 1.8%-2.5%; Al: 0.01%-0.03%; B: 0.001%-0.003%; and Ti: 0-0.05%. Moreover, the percentage by mass of C and Mn satisfies: C+Mn/6≥0.52. A microstructure of the cold-rolled steel plate has nano-precipitates having an average diameter less than 30 nm. The cold-rolled steel plate has ultra-high strength, high extension and high hole-expansion performance, and excellent molding performance.
Inventors:
XUE PENG (CN)
ZHU XIAODONG (CN)
LI WEI (CN)
ZHU XIAODONG (CN)
LI WEI (CN)
Application Number:
PCT/CN2023/101458
Publication Date:
December 28, 2023
Filing Date:
June 20, 2023
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/02; C21D1/20; C21D8/02; C22C38/04; C22C38/06
Domestic Patent References:
| WO2017169869A1 | 2017-10-05 | |||
| WO2022049412A1 | 2022-03-10 |
Foreign References:
| CN109628846A | 2019-04-16 | |||
| CN106119694A | 2016-11-16 | |||
| CN109576579A | 2019-04-05 | |||
| CN109023055A | 2018-12-18 | |||
| CN112752862A | 2021-05-04 |
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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