炼钢 ›› 2015, Vol. 31 ›› Issue (6): 67-.

• 生产实践 • 上一篇    下一篇

冷轧钢板表面条状缺陷的研究

  

  1. 首钢京唐钢铁联合有限责任公司 炼钢作业部,河北 唐山 063200
  • 接受日期:1900-01-01 出版日期:2015-12-05

Study on surface sliver defect of cold-rolled sheet

  • Accepted:1900-01-01 Online:2015-12-05

摘要: 针对首钢京唐钢铁联合有限责任公司冷轧板出现的条状缺陷,对冷轧板取样分析,确定了Al2O3类夹杂物、保护渣类夹杂物和FeO类缺陷是冷轧板条状缺陷产生的主要原因。通过采取钢包渣改质降低顶渣氧化性,合理控制RH纯循环时间促进夹杂物上浮,增加钢包镇静时间提高钢水纯净度,优化保护渣性能,控制拉速、优化水口结构、减少吹气量降低液位波动,降低出钢温度和除鳞水系统改造等措施,冷轧钢板表面条状缺陷由0.59%降至0.25 %以下。

关键词: 冷轧钢板, 条状缺陷, 夹杂物, 控制

Abstract: Sliver defects appeared on surface of coldrolled sheet were studied by scanning electron microscope(SEM),and qualitatively analysis of dispersive spectrum(EDS) in Shougang Jingtang. The results show that the defect was caused mainly by Al2O3inclusions, mould powder and FeO. This kind of defect was effectively controlled by the modification of ladle slag to reduce the top slag oxidation, reasonable pure cycle time of RH and increasing the sedation time of ladle ensuring inclusion floating, optimizing performance of mould powder and structure of nozzle, control speed, decreasing argon blowing to reducing the liquid level fluctuation,reduce the tapping temperature and water descaling system reform measures, cold rolled steel strip surface defects by 0.59 %to below 0.25 %.

Key words: cold rolled steel plate, strip defect, inclusion, control