重轨真空处理后氢含量控制工艺实践

Process practice of hydrogen content control after heavy rail vacuum treatment

阐述了氢对重轨钢的危害,简要介绍了大生产中钢液中氢的检测方法和氢的主要来源;重点分析了转炉—LF炉—RH炉—连铸工艺流程,从RH真空处理、RH真空处理后、软吹及浇铸过程中氢的变化及来源,确定RH真空处理后软吹工艺控制不当是中包增氢的主要来源之一,提出了有效控制重轨钢真空处理后增氢的措施,可以实现中包w([H])≤1.00×10^(-6)。

The hazards of hydrogen to heavy rail steel were described.The detection method and the main source of hydrogen in molten steel in large-scale production were briefly introduced.The process flow of converter-LF furnace-RH furnace-continuous casting was analyzed.From the changes and sources of hydrogen in RH vacuum treatment,after RH vacuum treatment,soft blowing and casting process,determining the improper control of the soft blowing process after vacuum treatment is one of the main sources of hydrogen increase in tundish.The effective measures to control hydrogen increase after vacuum treatment of heavy rail steel were put forward,which can achieve hydrogen mass fraction≤1.00×10^(-6).