汽车用高强钢夹杂物控制生产实践

Production Practice of Inclusions Control in High Strength Steel for Automobile

以LF+RH双联工艺流程生产的高强汽车板钢种为例,通过调整钙处理时机、优化精炼工艺来控制高强钢中夹杂物,对比工艺调整前后关键过程指标和夹杂物控制水平。结果表明:调整后RH至中包过程铝损、钛损、中间包全氧及中包钢水夹杂物密度和夹杂物面积率均有所改善;调整后夹杂物最高为1.5级,且绝大部分控制在1.0级以内,夹杂物控制改善明显,材料加工成型过程未再出现因夹杂物导致的开裂事件。

The high-strength automotive steel produced by the LF+RH process flow was compared before and after adjusting the calcium treatment timing and optimizing the refining process.The key process indicators and inclusion control levels before and after the adjustment were compared.The results showed that the aluminum loss,titanium loss,tundish oxygen,and inclusion density and area rate of the steel in the tundish during the RH-to-tundish process were improved after the adjustment.The maximum inclusion level after adjustment was 1.5,and most of them were controlled within 1.0,the inclusion control was significantly improved,and there were no cracking incidents caused by inclusions during the material processing and forming process.