Title:
LOW-CARBON, LOW-ALLOY AND HIGH-FORMABILITY DUAL-PHASE STEEL HAVING TENSILE STRENGTH OF GREATER THAN OR EQUAL TO 590 MPA, HOT-DIP GALVANIZED DUAL-PHASE STEEL, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/206915
Kind Code:
A1
Abstract:
A low-carbon, low-alloy and high-formability dual-phase steel having a tensile strength of greater than or equal to 590 MPa, a hot-dip galvanized dual-phase steel, and a manufacturing method therefor by means of rapid heat treatment. The steel comprises the following components, in percentage by mass: 0.04-0.12% of C, 0.1-0.5% of Si, 1.0-2.0% of Mn, P≤0.02%, S≤0.015%, 0.02-0.06% of Al, and can further comprise one or two of Cr, Mo, Ti, Nb and V, wherein Cr+Mo+Ti+Nb+V≤0.5%, and the balance is Fe and other unavoidable impurities. The manufacturing method therefor includes smelting, casting, hot rolling, cold rolling, and rapid heat treatment processes. In the present invention, by controlling rapid heating, short-term thermal insulation and rapid cooling processes during the process of rapid heat treatment, the recovery of a deformed structure, recrystallization and austenite transformation processes are changed, the nucleation rate is increased, the grain growth time is shortened, grains are refined, the strength and n value of the material are improved, and the interval range of the material performance is expanded.
Inventors:
LI JUN (CN)
WANG JIAN (CN)
WANG JUNFEI (CN)
WANG CHAO (CN)
ZHANG BAOPING (CN)
LIU HUAFEI (CN)
DAI JINGGE (CN)
LIU YIMIN (CN)
LU FENGZHI (CN)
YANG HONGLIN (CN)
WANG JIAN (CN)
WANG JUNFEI (CN)
WANG CHAO (CN)
ZHANG BAOPING (CN)
LIU HUAFEI (CN)
DAI JINGGE (CN)
LIU YIMIN (CN)
LU FENGZHI (CN)
YANG HONGLIN (CN)
Application Number:
PCT/CN2022/084537
Publication Date:
October 06, 2022
Filing Date:
March 31, 2022
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/02; C21D8/02; C22C38/06; C22C38/26; C22C38/38
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Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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