用塔形试样对比研究了水平连铸管坯和轧制管坯穿孔时顶头前压缩率对孔腔形成的影响。实验结果表明，水平连铸管坯的塑性比轧制管坯差，斜轧穿孔时水平连铸管坯形成孔腔的可能性比轧制管坯大得多。 The tower-shaped samples were used to compare the influence of the pre-head compression rate on the cavity formation when the horizontal continuous casting tube and the rolled tube were perforated. The experimental results show that the horizontal continuous casting tube is less plastic than the rolled tube and the possibility of horizontal continuous casting tube forming the cavity is much larger than that of the rolled tube during the oblique piercing.