炼钢

• 凝固与浇铸 • 上一篇    下一篇

连铸圆坯表面纵裂原因及控制措施

汪国才,李 浩,陶承岗,张 诚   

  1. (马鞍山钢铁股份有限公司 特钢分公司,安徽 马鞍山 243000)
  • 接受日期:1900-01-01 出版日期:2020-04-05

Causes analysis and control measures of longitudinal cracks on the surface of continuous casting round billet

  • Accepted:1900-01-01 Online:2020-04-05

摘要: 阐明了圆坯纵裂形成机理,通过解剖分析马钢圆坯纵裂坯壳,采用现场调研和数据分析的方式查清了圆坯产生纵裂的主要原因为:钢水中有害元素S含量、保护渣性能不良、浸入式水口插入深度不合适及对中不良、铸温铸速不合适、结晶器弧度及结晶器冷却强度不合等。根据现场生产实际情况,通过采取措施,使圆坯纵裂率由0.63 %降至0,有效的控制了圆坯纵裂,同时实现了圆坯连铸零纵裂漏钢率。

关键词: 连铸圆坯, 纵裂漏钢, 保护渣, 浸入式水口, 结晶器

Abstract: The formation mechanism of longitudinal crack of round billet was expounded. The main causes of longitudinal crack of round billet were found out by field investigation and data analysis through anatomical analysis of longitudinal crack shell of round billet at Masteel. The main causes were as follows: harmful element sulfur content in molten steel, poor performance of mold fluxes, off-center and improper inserting depth of submerged entry nozzle, inappropriate temperature and speed of casting, inappropriate radian o and cooling intensity of the mould . According to the actual production situation on the spot,some measures were taken to reduce the longitudinal crack rate of round billet from 0.63 % to 0, the longitudinal crack of round billet was controlled, and the zero longitudinal crack breakout rate was realized.

Key words: continuous casting round billet, longitudinal crack breakout, mold flux, submerged entry nozzle, crystallizer