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

孔是轧制钢管的重要设,架又是孔的核心组成部分。

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

简要介绍了三辊孔所毛管的质量孔特有的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”).

对设言,指无马达和用手操作的设(如人工键孔、人工打字)。