Title:
DUAL-PHASE STEEL AND HOT-DIP GALVANIZED DUAL-PHASE STEEL HAVING TENSILE STRENGTH GREATER THAN OR EQUAL TO 980MPA AND METHOD FOR MANUFACTURING SAME BY MEANS OF RAPID HEAT TREATMENT
Document Type and Number:
WIPO Patent Application WO/2022/206913
Kind Code:
A1
Abstract:
A low-carbon and low-alloy dual-phase steel and hot-dip galvanized dual-phase steel having tensile strength greater than or equal to 980 MPa and a method for manufacturing by means of rapid heat treatment. The steel has the following chemical components in percentage by mass: C: 0.05-0.17%, Si: 0.1-0.7%, Mn: 1.4-2.8%, P≤0.020%, S≤0.005%, B≤0.005%, and Al: 0.02-0.055%, and may also contain two or more of Nb, Ti, Cr, Mo, and V, Cr+Mo+Ti+Nb+V≤1.1%, and the balance is Fe and other inevitable impurities. The method for manufacturing the steel comprises: smelting, casting, hot rolling, cold rolling and rapid heat treatment procedures. According to the present invention, the recovery, recrystallization and austenite transformation process of a deformed structure is changed by controlling the rapid heating, short-time heat preservation and rapid cooling process in a rapid heat treatment process, the nucleation rate is increased, the grain growth time is shortened, grains are refined, the strength of the material is improved, and the performance range of the material is expanded.
Inventors:
WANG JIAN (CN)
LI JUN (CN)
ZHANG LIYANG (CN)
LIU HUAFEI (CN)
WANG JUNFEI (CN)
DU XIAOFENG (CN)
XIONG WEI (CN)
ZHANG BAOPING (CN)
LU FENGZHI (CN)
MAO ZHANHONG (CN)
GUAN CHUANG (CN)
LI JUN (CN)
ZHANG LIYANG (CN)
LIU HUAFEI (CN)
WANG JUNFEI (CN)
DU XIAOFENG (CN)
XIONG WEI (CN)
ZHANG BAOPING (CN)
LU FENGZHI (CN)
MAO ZHANHONG (CN)
GUAN CHUANG (CN)
Application Number:
PCT/CN2022/084529
Publication Date:
October 06, 2022
Filing Date:
March 31, 2022
Export Citation:
Assignee:
BAOSHAN IRON & STEEL (CN)
International Classes:
C22C38/22; C21D8/02; C22C38/24; C22C38/26; C22C38/28
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Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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