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

穿是轧制钢管重要设备,而架又是穿组成部分。

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

简要介绍了三辊穿所穿毛管质量及该穿特有轧制故障和预防措施。

Of equipment; without a motor and intended for hand operation (“a manual keypunch”; “a manual typewriter”).

对设备而言,指无马达和用手操作设备(如人工键穿、人工打字)。