Regardless of how raw metal is turned into a tube or a pipe, the production process can leave quite a bit of residual material on the surface. Forming and welding on a mill, drawing on a draw bench, or using a pilger mill or extrusion press, followed by a cut-to-length process, can leave a tube or pipe surface grimy with lubricant and possibly littered with debris. Common contaminants that need to be removed from internal and external surfaces include drawing and cutting lubricants, both oil- and water-based; metal chips from cutting operations; and shop dust and debris.
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