LF喂Si-Ca线对X70管线钢夹杂物变性的影响  

Effect of LF Feeding Si-Ca Wire on Modification of Inclusion in Pipeline Steel X70

作　　者：王敏[1] 包燕平[1] 刘建华[1] 李太全[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《特殊钢》2009年第5期50-52,共3页Special Steel

摘　　要：100 t BOF-LF-RH-CC流程冶炼X70管线钢[%:0.04C、1.53Mn、0.106(Nb+V+Ti)],并在LF精炼时采用喂Φ13 mm 60Si-28Ca线处理。经计算和生产试验得出,喂线速度由100 m/min提高至200 m/min时,平均钙收得率由4.05%提高至14.93%,以200 m/min喂入Si-Ca线420～500 m时满足硫化物变性要求,铸坯中69%夹杂为2～10μm球形或类球形夹杂,且处在CaO-Al_2O_3-MgO系相图低熔点区,变性效果好。Pipeline steel X70 [ % ： 0.04C, 1.53Mn, O. 106（ Nb ＋ V ＋ Ti） ] is melted by 100 t BOF-LF-RH-CC flow sheet and feeding Ф13 mm 60Si-28Ca wire treatment is used during LF refining. It is obtained by calculation and commercial production test that with increasing wire feeding speed to 200 m/min from 100 m/min, the average calcium yield increases to 14. 93% from 4. 05%, and with feeding 420 -500 m Si-Ca wire by 200 m/min, the requirement of modification on sulfide is satisfied, 69% inclusions in cast billet are 2 - 10 μm globular and similar to globoid which locate at low-melting-point zone in CaO-AlaO3-MgO phase diagram with nice modification effect.

关 键 词：X70管线钢 LF 钙处理 喂线 

分 类 号：TF703.8[冶金工程—钢铁冶金]