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
高振波 1张慧 2王明林 2杨宝 3汪国才 1张国庆1
作者信息
- 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. 钢铁研究总院 连铸技术国家工程研究中心,北京 100081;陕钢集团产业创新研究院有限公司,陕西 汉中 723000
- 折叠
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%.
Abstract
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 super-heat 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 con-tent 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Key words
bearing steel/square billet/pressing process/segregation/shrinkage hole/numerical simulation引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据