To introduce the process of wire drawing process, chemical Cu-plating process and formulation of top grade submerged-arc welding wire for pipe line steel.
介绍管线钢用高等级埋弧焊丝拉丝工艺、化学镀铜工艺及配方。
One-time line drawing can be directly completed on the steel pipe by the utility model with exact line drawing.
使用它能够直接在钢管上一次画线完成，而且画线准确，因此大量节省时间和材料。
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