Technology for Making Cold-Deformed Tubes of Plain-Carbon Steel

The main competition in the market for cold-deformed tubes comes from technologies that make it possible to increase productivity while reducing costs and improving product quality. The production of cold-deformed tubes is a process that consists of many operations and cycles. Each deformation cycle involves the application of a lubricant to the semifinished product, cold plastic deformation of the latter by rolling or drawing, degreasing of the surface, and heat treatment of the tubes in a protective (N2 - 5% H2) atmosphere. Reaction products (such as phosphates), soaps (sodium stearate), and chlorinated paraffin are among the materials used as the lubricant. The effect obtained from their use is based on their ability to form a lubricating film that protects the surface of the metal from contact with the tool. The surface is degreased by immersing and holding the tubes in an alkali solution.