穿孔机

The briefing covers quality of the shell pierced by the three-high piercing mill, thespecific rolling failures and countermeasures thereagainst.

简地介绍了三辊机所毛管的质量及该机特有的轧故障和预防措。

Piercing mill is the most important equipment on the rolling pipe line,and the frame is the nucleal component of the piercing mill.

机是轧钢管的备,而机架又是机的核心组成部分。