The total oxygen content(T[O]),nitrogen content ([N]) and non-metallic inclusion in steel 39Mn2V at each phase of EAF-LF(VD)-CC process have been analyzed and studied.The results indicated that the(T[O]) was 28×10~(-6) after LF(VD) refining and the(T[O]) of cast billet was(8~10) ×10~(-6);and the inclusions in steel were mainly Al_2O_3,MnS,spherical calciumaluminate with size ≤20 μm.there were some inclusions with size 80~300 μm which originated from secondary oxidation,refractory material erosion and slag e...
【更新日期】
2006-11-21
【分类号】
TF762
【正文快照】
1各工序钢中总氧、氮的变化采用150 t EAF-LF+VD-喂Ca-Si线工艺生产39Mn2V钢的化学成分见表1。钢包到中间包采用全程吹氩保护长水口浇铸,中间包到结晶器采用浸入式水口保护浇铸,铸坯直径310 mm。表2可以看出,经过LF处理后钢水的平均T[O]由52×10-6降为39×10-6,降低了25·0%,VD