超快冷条件下Q370q升级Q460q的工业试制.pdfVIP

超快冷条件下 Q370q 升级 Q460q 的工业试制 1 1 2 2 3 3 沈钦义 李春智 谌铁强 庞 丽 陈 俊 唐 帅 （1.首钢技术研究院，北京 100041 ；2.首秦金属材料有限公司，秦皇岛 066326 ； 3. 东北大学轧制技术及连轧自动化国家重点实验室，沈阳 110819 ） 1 摘 要 本文采用低成本 Q370q 成分，在首秦 4300mm 轧机上利用控轧后超快冷工艺成功实现了 Q370q 升级为 Q460q 的工业试制。试制的34mm 厚试制钢板,显微组织表面以贝氏体为主,t/4 及t/2 处以铁素体为主,屈服强度大于 480MPa,抗拉强度大于 610MPa,-40℃的 CVN 冲击吸收功大于 200J,屈强比小于 0.8 。各项性能完全满足了国标 GT/T714-2008 中Q460qE 的力学性能要求,达到了减量化及降低生产成本的目的。本研究对于企业降低生产成本,提 升中厚板产品力学性能具有重要意义。 关键词 桥梁钢 控轧控冷 超快冷 显微组织 力学性能 Pilot Production of Q370q up to Q460q under Ultra Fast Cooling Shen Qinyi1 Li Chunzhi1 Chen Tieqiang2 Pang Li2 Chen Jun3 Tang Shuai3 (1.Shougang Research Institute of Technology, Beijing, 100041; 2.Shouqin Metal Materials Co.,Ltd., Qinhuangdao, 066326;3. The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819) Abstract In the present paper, the industrial rolling trials of Q370q up to Q460q were realized successfully under ultra fast cooling after control processing on 4300mm plate mill and the chemical compositions of Q370q of low cost were adopted. The microstructures with bainite at surface and ferrite at t/4 and t/2 were gained., and the yield strength, tensile strength and CVN impact energies at -40℃ of the plate is higher than 480MPa, higher than 610MPa and are higher than 200J, respectively, the yield ratio is lower than 0.8 of pilot-produced plates of 34mm in thickness . The mechanical properties of the plate met the requirements of Grade Q460qE steel,GB/T714-2008.And the aims of reduction of chemical compositions and cost were also achieved. The study is beneficial to the steel makers in decreasing the steel making cost, and increasing the mec