【摘要】 从冶金效果、设备性能、工艺条件等方面对LF-RH与RH-LF二次精炼法进行了全面的研究,分析了两种工艺下RH真空处理的特点,对两种工艺下管线钢中有害元素及夹杂物的控制进行了讨论.LF-RH与RH-LF工艺下生产的X70管线钢铸坯中的T[O]平均为14×10-6和19×10-6,显微夹杂物个数分别为2.48个/mm2和2.62个/mm2,达到很高的洁净度水平.LF-RH工艺铸坯中氮平均为53×10-6,RH-LF工艺条件下铸坯氮含量为平均38×10-6,为以后生产更高质量的管线钢积累了经验.更多还原

【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 T[O] 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. The [N] 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.更多还原