Title:
780 MPA GRADE HIGH-SURFACE ULTRA-HIGH REAMING STEEL AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/042733
Kind Code:
A1
Abstract:
A 780 MPa grade high-surface ultra-high reaming steel and a manufacturing method therefor. The chemical components of the reaming steel, in weight percentages, are: 0.03-0.08% of C, ≤0.2% of Si, 0.5-2.0% of Mn, ≤0.02% of P, ≤0.003% of S, 0.01-0.08% of Al, ≤0.004% of N, 0.05-0.20% of Ti, 0.1-0.5% of Mo, ≤0.005% of Mg, ≤0.0030% of O, and the balance of Fe and other inevitable impurities. A steel plate/roll obtained in the present invention has a good surface quality, avoids the occurrence of red iron skin on the surface of strip steel, and improves the surface quality of an acid pickled high-strength steel; the yield strength of the steel plate/roll is ≥700 MPa, the tensile strength is ≥780 MPa, the elongation rate A50 is ≥17%, and the reaming rate is ≥80%, such that the high surface quality, high strength, high plasticity and ultra-high reaming rate are well matched; and the steel plate/roll can be applied to passenger car chassis parts such as a control arm, an auxiliary frame and other portions requiring a high strength and thinning.
Inventors:
WANG HUANRONG (CN)
YANG FENG (CN)
ZHANG CHEN (CN)
HUA JUNSHAN (CN)
LIU YUNHUA (CN)
NI YAPING (CN)
WANG MING (CN)
YANG FENG (CN)
ZHANG CHEN (CN)
HUA JUNSHAN (CN)
LIU YUNHUA (CN)
NI YAPING (CN)
WANG MING (CN)
Application Number:
PCT/CN2021/115435
Publication Date:
March 03, 2022
Filing Date:
August 30, 2021
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/02; B21B37/56; C21D6/00; C21D8/02; C21D9/00; C21D9/52; C22C33/04; C22C38/04; C22C38/06; C22C38/08; C22C38/12
Foreign References:
| CN106119699A | 2016-11-16 | |||
| CN109957716A | 2019-07-02 | |||
| CN111519107A | 2020-08-11 | |||
| JP2001355044A | 2001-12-25 |
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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