管子内部应清理干净，不得有焊接、锈皮及沙泥土、等赃物。

The inside of the pipe should be cleaned up, without welding, rust and dirt, sand and other stolen goods.

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然而锈皮在热轧板条厂卷期间在高温度被造形，因为锈在在室温的线圈的表面上被造形，这一个加工是所需。

This processing is required since rust is formed on the surface of the coils at room temperature whereas scales are formed at high temperature during rolling in Hot Strip Mill.

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HR 线圈， 是基本的原料，被道次过 CPL 把氧化物或者锈皮从分带表面移开使厚度的较进一步的还原反应能够在冷轧制造工厂需要水平。

The HR Coil, which is the basic raw material, is passed through CPL to remove the oxides or scales from strip surface to enable further reduction of thickness to desired level in Cold Rolling Mills.

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