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Experiment of Development C-Mn Dual-phase Hot Strip Steel by Ultra-fast Cooling Technology on CSP Line

LIU Yan-chun~1 DONG Rui-feng~2 YAN Bo~2 LIU Xiang-hua~1 WANG Guo-dong~1 1.The State Key Lab.of Rolling and Automation,Northeastern University,Shenyang 110004,China; 2.Baotou Steel(Union)Co.,Ltd.,Baotou 014010,China  
An industrial experiment of development 540MPa grade dual-phase hot strip steel by ultra-fast cool- ing technology on Baotou CSP line was introduced.The test dual-phase steel of 6mm thickness was produced by thin-slab continuous rolling and two stage cooling process,including of laminar and ultra-fast cooling;The mi- crostructures of the test dual-phase steel are ferrite and martensite,and the volume fraction of martensite is 12%.The mechanical properties of the test dual-phase steel are uniform with the tensile strength of 555~565MPa,the yield strength of 335~355MPa,the total elongation of 31%~34%,the yield ratio of 0.59~0.64 and the n value of 0.18.The test dual-phase steel with good service performance has been used tentatively for making the beam and the tail-board of heave-duty truck.
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