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Title:
DUAL-PHASE STEEL AND METHOD FOR THE FABRICATION OF THE SAME
Document Type and Number:
WIPO Patent Application WO/2018/035739
Kind Code:
A1
Abstract:
A dual-phase steel comprises 8-12 wt.% Mn, 0.3-0.6 wt.% C, 1-4 wt.% Al, 0.4-1 wt.% V, and a balance of Fe. The steel has martensite and retained austenite phases, and may include vanadium carbide precipitations. A method of making the dual-phase steel involves the steps of (a) hot rolling the ingots to produce a plurality of thick steel sheets, (b) treating the steel sheets by an air cooling process, (c) warm rolling the steel sheets at a temperature in the range of 300-800℃ with a thicknesses reduction of 30-50%, (d)annealing the steel sheets at a temperature in the range of 620-660℃ for 10-300 min, (e)cold rolling the steel sheets at room temperature with a thickness reduction of 10-30% to generate hard martensite, and (f)annealing the steel sheets at a temperature in the range of 300-700℃ for 3-60 min to form the dual-phase steel. The dual-phase steel has high strength and good ductility.

Inventors:
HUANG, Mingxin (16 Lychee Road East, Fairview ParkYuen Long, New Territories, Hong Kong, Kong, CN)
HE, Binbin (Flat C, 2nd Floor Bo Wah House, 36 Li Po Lung Path,Kennedy Town, Hong Kong, Kong, CN)
Application Number:
CN2016/096509
Publication Date:
March 01, 2018
Filing Date:
August 24, 2016
Export Citation:
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Assignee:
THE UNIVERSITY OF HONG KONG (Pokfulam Road, Hong Kong, Kong, CN)
International Classes:
C22C38/58; B21B1/06
Domestic Patent References:
WO2009090231A82010-04-01
Foreign References:
CN104328360A2015-02-04
CN104379791A2015-02-25
CN102828109A2012-12-19
CN103781931A2014-05-07
Attorney, Agent or Firm:
CHINA PATENT AGENT (H.K.) LTD. (22/F, Great Eagle Center23 Harbour Road, Wanchai, Hong Kong, Kong, CN)
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