DUAL-PHASE STEEL AND METHOD FOR THE FABRICATION OF THE SAME

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.

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Inventors:

HUANG MINGXIN (CN)
HE BINBIN (CN)

Application Number:

PCT/CN2016/096509

Publication Date:

March 01, 2018

Filing Date:

August 24, 2016

Export Citation:

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Assignee:

UNIV HONG KONG (CN)

International Classes:

C22C38/58; B21B1/06

Domestic Patent References:

WO2009090231A8

2010-04-01

Foreign References:

CN104328360A	2015-02-04
CN104379791A	2015-02-25
CN102828109A	2012-12-19
CN103781931A	2014-05-07

Other References: