250 mm×250 mm轴承钢大方坯压下工艺优化及质量提升  

Process Optimization and Quality Improvement of 250 mm×250 mm Bearing Steel Square Billet Pressing

作　　者：高振波[1] 张慧[2] 王明林[2] 杨宝 汪国才[1] 张国庆 GAO Zhenbo;ZHANG Hui;WANG Minglin;YANG Bao;WANG Guocai;ZHANG Guoqing(Ma’anshan Iron&Steel Co.Ltd.,Ma’anshan 243000,China;National Research Center of Continuous Casting Technology,Central Iron&Steel Research Institute,Beijing 100081,China;Shaanxi Steel Group Industrial Innovation Research Institute Co.Ltd.,Hanzhong 723000,China)

机构地区：[1]马鞍山钢铁股份有限公司,安徽马鞍山243000 [2]钢铁研究总院连铸技术国家工程研究中心,北京100081 [3]陕钢集团产业创新研究院有限公司,陕西汉中723000

出　　处：《甘肃冶金》2024年第1期57-63,共7页Gansu Metallurgy

摘　　要：建立了250 mm×250 mm轴承钢大方坯的凝固传热模型,并根据凝固平方根定律验证了模型的准确性。讨论了拉速和过热度对凝固终点的影响,并制定新的压下制度。运用不同压下制度进行了工业试验,试验结果表明:优化后的压下制度基本消除大方坯的中心缩孔,使得中心偏析比由1.1降低至1.0,同时使得V形偏析线上最高碳含量由1.391%降至1.184%,V形偏析线上和非偏析线上的平均碳含量极差由0.113%降至0.07%。The solidification heat transfer model of 250 mm×250 mm bearing steel square billet was established,and the accuracy of the model was verified according to the solidification square root law.The influence of drawing speed and superheat on solidification end point is discussed,and a new pressing system is developed.Industrial tests were carried out with different pressure systems,and the test results showed that:the optimized reduction system basically eliminates the center shrinkage hole of the square billet,reduces the center segregation ratio from 1.1 to 1.0,reduces the maximum carbon content on the V-shaped segregation line from 1.391%to 1.184%,and reduces the average carbon content range between the V-shaped segregation line and the non-segregation line from 0.113%to 0.07%.

关 键 词：轴承钢 大方坯 压下工艺 偏析 缩孔 数值模拟 

分 类 号：TF777[冶金工程—钢铁冶金]