炼钢 ›› 2023, Vol. 39 ›› Issue (2): 49-55.

• 凝固与浇铸 • 上一篇    下一篇

高硅含钛奥氏体不锈钢“结晶器结鱼”分析及改进

陈兴润,马国财,魏维岗,胡桓彰,刘  斌,潘吉祥   

  1. 酒钢集团 宏兴钢铁股份有限公司,甘肃 嘉峪关 735100
  • 出版日期:2023-04-05 发布日期:2023-04-06

  • Online:2023-04-05 Published:2023-04-06

摘要: 通过对“结晶器结鱼”物和中间包夹杂物检测,系统分析了高硅含钛奥氏体不锈钢“结晶器结鱼”现象发生的根本原因。结果表明:“结晶器结鱼”物和中间包中夹杂物类型主要为纯的TiN和以镁铝尖晶石为核心的TiN。TiN夹杂物是导致“结晶器结鱼”产生的根本原因。结合热力学计算和试验结果,TiN夹杂物在1 455 ℃的液相线温度下就会析出。通过控制钢水w(N)<0.01 %,中间包钢水温度大于1 500 ℃,可以避免“结晶器结鱼”的发生。

关键词: 高硅含钛奥氏体不锈钢, 氮化钛, 结晶器结鱼, 中间包

Abstract: The floater in mould were analyzed by sampling the floater of mould and the molten steel in tundish during high silicon titanium stabilized austenitic stainless steel casting process. The results show that the inclusions in the floater of mould and tundish are both mainly pure TiN and TiN with MgO·Al2O3 as core. TiN inclusions are the cause of floater in mould. By combining both the experimental results and thermodynamic calculation, TiN inclusions would be formed at liquidus temperature of 1 455 ℃. As the mass fraction of nitrogen is less than 0.01 % in molten steel and the temperature in tundish is higher than 1 500 ℃,the floater cannot been found in mould.

Key words: high silicon titanium stabilized austenitic stainless steel, TiN, floater in mould, tundish