Title:
YIELD-RATIO-CONTROLLED STEEL AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/169779
Kind Code:
A1
Abstract:
Disclosed are a yield-ratio-controlled steel and a manufacturing method therefor. The mass percentages of the components of the steel are 0.245-0.365% of C, 0.10-0.80% of Si, 0.20-2.00% of Mn, P ≤ 0.015%, S ≤ 0.003%, 0.20-2.50% of Cr, 0.10-0.90% of Mo, 0-0.08% of Nb, 2.30-4.20% of Ni, 0-0.30% of Cu, 0.01-0.13% of V, 0-0.0020% of B, 0.01-0.06% of Al, 0-0.05% of Ti, Ca ≤ 0.004%, H ≤ 0.0002%, N ≤ 0.013%, and O ≤ 0.0020%, with (8.57*C+1.12*Ni) ≥ 4.8% and 1.2% ≤ (1.08*Mn+2.13*Cr) ≤ 5.6% being satisfied, and with the balance being Fe and unavoidable impurities. The steel has an excellent low-temperature impact toughness and aging impact toughness at -20°C and -40°C, a rationally controlled yield ratio, and an ultra-high strength, ultra-high strength toughness and ultra-high strength plasticity. The steel can be used in applications requiring steel with a high strength and toughness, e.g. marine platform mooring chains, mechanical structures, and automobiles.
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Inventors:
ZHAO SIXIN (CN)
HUANG ZONGZE (CN)
GAO JIAQIANG (CN)
ZHANG JUN (CN)
HUANG ZONGZE (CN)
GAO JIAQIANG (CN)
ZHANG JUN (CN)
Application Number:
PCT/CN2021/075734
Publication Date:
September 02, 2021
Filing Date:
February 07, 2021
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/02; C21D8/06; C22C38/04; C22C38/42; C22C38/44; C22C38/46; C22C38/48
Foreign References:
| CN109136737A | 2019-01-04 | |||
| SU602595A1 | 1978-04-15 | |||
| JPS5565323A | 1980-05-16 | |||
| JPH03229826A | 1991-10-11 | |||
| CN102747303A | 2012-10-24 | |||
| CN103898406A | 2014-07-02 | |||
| CN107794452A | 2018-03-13 | |||
| CN103667953A | 2014-03-26 |
Attorney, Agent or Firm:
WATSON & BAND INTELLECTUAL PROPERTY AGENT LTD. (CN)
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