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高碳钢小方坯连铸拉矫辊静态轻压下工艺研究

  

  1. (安阳钢铁股份有限公司,河南 安阳 455004)
  • 接受日期:1900-01-01 出版日期:2015-08-05

Study on the static soft reduction fomed by the pulling straightening roller in continuous cast high carbon steel billet

  • Accepted:1900-01-01 Online:2015-08-05

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。

关键词: 高碳钢, 小方坯, 拉矫辊, 静态轻压下, 中心偏析

Abstract: 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 secondary cooling. The results showed that certain reduction formed by appropriate pressure 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 optimization, the low power grading results indicate that the highest shrinkage defects rating 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 index 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.

Key words: high carbon steel, billet, pulling straightening roller, static soft reduction, center segregation