pinhole

The defects on pinhole bubble formed in slabs result from badness deoxidization,and the defects on large volume bubbles formed in slabs result from the high flux of argon during casting.

铸坯内产生针孔气泡缺陷的原因是钢液脱氧不良,产生大体积气泡缺陷的原因是铸机浇注过程中氩气流量过高。