摘要
安阳钢铁股份有限公司150 mm×150 mm小方坯铸机生产实践中,通过调整现有拉矫辊压力并配合拉速和二冷配水的调节,对高碳钢铸坯凝固末端实施静态轻压下试验。试验结果表明:合适压力条件下所形成的一定压下量,再配以恰当的拉速,可使拉矫辊压力能传递到铸坯较佳压下区。采用该工艺后,铸坯缩孔由最高3.0级降至最高2.0级,疏松由最高2.5级降至最高1.5级,凝固中心碳偏析指数由最高1.35降至最高1.08。拉矫辊静态轻压下对铸坯纵剖低倍整体缩孔尺寸与疏松面积有一定改善。
During the 150 mm×150 mm billet continuous casting practice,static soft reduction at the solidification end of the high carbon steel billet had been implemented by adjusting the current pulling straightening roller pressure, drawing speed and the sec- ondary cooling. The results showed that certain reduction formed by appropriate pres- sure matching with the appropriate casting speed could make the pulling straightening roller pressure be passed to the more suitable soft reduction zone. After the process op- timization, the low power grading results indicate that the highest shrinkage defects rat- ing decreased from grade 3.0 to grade 2. 0, the highest center porosity rating decreased from grade 2. 5 to grade 1.5, and the highest solidification center carbon segregation in- dex decreased from 1.35 to 1.08. The whole shrinkage size and the center porosity areas had been improved to some extent under the static soft reduction formed by the pulling straightening roller.
出处
《炼钢》
CAS
北大核心
2015年第4期59-62,67,共5页
Steelmaking
关键词
高碳钢
小方坯
拉矫辊
静态轻压下
中心偏析
high carbon steel
billet
pulling straightening roller
static soft reduction
center segregation
