RH生產X70管線鋼的不同工藝研究

Study on different RH processes to produce pipeline steel-X70

摘要: 從冶金效果、設備性能、工藝條件等方面對LF-RH與RH-LF二次精煉法進行了全面的研究,分析了兩種工藝下RH真空處理的特點,對兩種工藝下管線鋼中有害元素及夾雜物的控制進行了討論.LF-RH與RH-LF工藝下生產的X70管線鋼鑄坯中的TO平均為14×10^-6和19×10^-6,顯微夾雜物個數分別為2.48個/mm²和2.62個/mm²,達到很高的潔凈度水平.LF-RH工藝鑄坯中氮平均為53×10^-6,RH-LF工藝條件下鑄坯氮含量為平均38×10^-6,為以后生產更高質量的管線鋼積累了經驗.

Abstract: The comparison of different RH processes was presented including the process condition and metallurgical effect. The characteristic of two different RH-processes was analyzed and how to control the bale-ful element and inclusions in pipeline steel were discussed. The TO of LF-RH and RH-LF are 14×10^-6 and 19×10^-6. The micro-inclusion numbers of LF-RH and RH-LF are 2.48/mm² and 2.62/mm². TheN of LF-RH and RH-LF are 53×10^-6 and 38×10^-6. From these practices, the experience for producing high quality oil-pipe steel in the future was accumulated.