Transactions of Materials and Heat Treatment

Title：Optimization on process parameters for reducing banded structure of Q235 hot rolled steel plate

Authors： Ji Yeyi1 Lu Baoshan1 Guan Jiju1 Li Qiangwei2

Unit： 1. Department of Precision Manufacturing Engineerin g Suzhou Vocational Institute of Industrial Technology 2. Engineering Training Center Soochow University

KeyWords： Q235 hot rolled steel plate banded structure bending formability Taguchi method finishing rolling coiling

ClassificationCode：TG335

year,vol(issue):pagenumber：2022,47(6):141-147

Abstract：

To reduce banded structure in Q235 hot rolled steel plate and improve its bending formability, four process parameters such as finishing rolling speed, finishing rolling temperature, coiling speed and coiling temperature were selected by Taguchi orthogonal experiment method, and the influences of process parameters on maximum thickness and maximum length of banded structure were discussed after Q235 steel plate was hot rolled. Then, the best hot rolling process parameters combination for Q235 hot rolled steel plate was confirmed, and the bending test was carried out. The results show that the influence degree of process parameters on the maximum thickness of banded structure is in the order of finishing rolling temperature > finishing rolling speed > coiling temperature > coiling speed, and the influence degree on the maximum length of banded structure is in the order of finishing rolling temperature > coiling temperature coiling speed> finishing rolling speed. The optimal combination of hot rolling process parameters to reduce the banded structure of Q235 hot rolled steel plate is the finishing rolling speed of 0.8 m·s-1, the finishing rolling temperature of 870 ℃,the colling speed of 2.8 m·s-1,and the colling temperature of 650 ℃. Under this hot rolling condition, the maximum thickness of banded structure is reduced by 64%, and the maximum length is reduced by 74%.

Funds：

国家自然科学基金青年基金资助项目（51805345）；江苏省自然科学基金青年基金资助项目（BK20170373）；江苏高校“青蓝工程”资助项目（2019）；苏州市重点实验室资助项目（SZS201815）；江苏省高职院校教师专业带头人高端研修（2022GRGDYX053)

季业益(1980-)，男，硕士，副教授 E-mail：00314@siit.edu.cn

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