9Yang Shufeng, Wang Qiangqiang, Zhang l.ifeng, el aL Formation and modification of MgO" AI2 03 based inclusions in alloy steels[[Jj. Metallurgical and Materials Transactions B, 2012, 13(41:731 750.
10Zhang Lifeng, Thomas B G. State of the art in evaluation and control of steel eleanliness[J~. ISIJ lnt, 2003, 43(3): 271 291.