连铸坯皮下内裂在穿孔过程中的变化

The Changes of Underskined Interal Crack of Continuous Casting Billet During Piercing Process

本文研究了连铸管坯皮下内裂在管坯中的分布规律，以及在二辊斜轧穿孔过程中衍变成外横裂和外折的形貌和特征。

This article studies on the distributional law of underskined internal crack in steel billets of continuous casting billet in additon to the appearance and features of the outer cross crack and outer fold which result from the internal crack during the piercing process.