摘要
针对高碳钢倒角裂纹及凸包缺陷是由于结晶器内凝固坯壳传热控制不当造成,进行了结晶器倒角参数和保护渣性能优化设计。实验结果表明,采用倒角为10 mm×45°的等边直角,以及低粘度和低熔点的改进型结晶器保护渣,有利于结晶器与铸坯凝固坯间的传热控制和润滑,消除了角部裂纹缺陷,大幅降低了凸包缺陷,生产的重轨钢角部缺陷比例由改进前的2.74%降低至0.32%,角部缺陷的危害程度和风险得到良好控制,同时降低了结晶器使用成本。
Aiming at the chamfering cracks and convexity defects of high carbon steel due to improper heat transfer control of the solidified shell in the mold, the design of mold chamfering parameters and the performance of the slag were optimized. The experimental results showed that the use of an equilateral right angle with a chamfer of 10 mm×45 °and an improved mold mold slag with low viscosity and low melting point were beneficial to the heat transfer control and lubrication between the mold and the solidified bloom and so corner cracking defects were eliminated, and the convexity defects were greatly reduced;the proportion of heavy rail steel with corner defects was reduced from 2.74% before improvement to 0.32%. The damage level and risk of defects were well controlled, and the cost of mold was also reduced.
作者
石鹏
Shi Peng(Pangang Group Steel and Vanadium Co.,Ltd.,Panzhihua,Sichuan 617022)
出处
《特钢技术》
CAS
2019年第3期15-19,共5页
Special Steel Technology
关键词
重轨钢
大方坯
角部缺陷
结晶器倒角尺寸
保护渣
heavy rail steel
bloom
corner defects
chamfering size of mold
mould flux
