Cf53钢冶炼浇铸工艺研究

采用60tBOF→60tLF→200mm×200mm方坯CC工艺生产Cf53钢,冶炼与连铸工艺要点包括：控制转炉终点成分、温度和下渣量;控制LF炉渣碱度R在4.0～5.5之间,渣中w（Al2O3）15%～20%、w（MnO＋FeO）〈1.5%;优化喂线工艺,保证白渣保持时间不小于15min;采用全保护浇铸和M＋F电磁搅拌等。检验结果表明,采用该工艺生产的Cf53钢中,w（O）平均为6.6×10-6,w（N）平均为73.55×10-6,铸坯缩孔和中心疏松均在1.0级以下,明显改善了铸坯的宏观组织形貌。

Study on smelting and casting technologies of Cf53

Cf53 steel is produced at Jiyuan Steel by using 60tBOF-60t LF 200 mm×200 mm CC processes.The key smelting and casting technologies are as follows: controlling of BOF endpoint compositions,temperature and the quantity of slag;controlling of slag basicity R for LF in a range of 4-5.5,Al2O3 content in slag 15 %-20 %,w(MnO+FeO)<1.5 %,optimizing of wire feeding process to ensure white slag retaining time not less than 15 minutes;adopting of whole protective casting and M+F electromagnetic stirring.Testing results showed that Cf53 steel produced by the technologies has good quality and properties,average O] 6.6×10-6,average N] 73.55×10-6,casting shrinkage and porosity are in Rank 1,which means the macro morphology of casting billet are significantly improved.