Transactions of Materials and Heat Treatment

Title：Rolling technology and microstructure and properties on seismic steel plate for highrise buildings

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ClassificationCode：TG142.1

year,vol(issue):pagenumber：2021,46(1):186-190

Abstract：

The influences of initial cooling temperature and final cooling temperature on microstructure, ferrite, M/A island proportion and tensile properties at room temperature of Q550D steel plate were studied by optical microscope and universal tensile testing machine. The results show that under different initial cooling temperatures and final cooling temperatures, the shapes of M/A islands in the sample are mainly granular, massive and intermittently distributed strips, and the M/A islands are mainly distributed at the boundary of bainite or ferrite. The volume fraction of M/A islands in the sample increases with the decreasing of the initial cooling temperature or the final cooling temperature, and the ferrite content increases gradually with the decreasing of the initial cooling temperature and decreases slightly with the decreasing of the final cooling temperature. Under the same final cooling temperature, the influence of reducing the initial cooling temperature on the tensile strength of sample is not significant, but the yield strength and yield strength ratio decrease. Under the same initial cooling temperature, the reduction of the final cooling temperature increases the yield strength and yield strength ratio. When the initial cooling temperature is 755 ℃ and the final cooling temperature is 395 ℃, the sample has the best comprehensive performance, the tensile strength and yield strength are 781 and 640 MPa respectively, and the yield strength ratio is 0.82, which meets the technical requirements of anti-seismic steel plate with 590 MPa grade.

Funds：

基金项目:陕西省科技攻关资助项目(2018KD8-G16)

作者简介：赵夏清（1986-），女，硕士，讲师 E-mail：404628984@qq.com

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