Today, cold-drawn steel wire change microstructure and mechanical properties of the hardening process. As the degree of cold deformation increases, the tensile strength, hardness and elastic limit of the cold drawn wire increase, and the elongation and area shrinkage rate decrease. Due to the existence of work hardening, when the degree of tensile deformation reaches a certain limit, the cold working performance of the steel wire is significantly reduced. When it is not suitable for continuous stretching, friction can be reduced, pulling force and mold consumption can be reduced, and products with surface finish, size and shape requirements can be obtained, which must be lubricated with lubricating oil.
When solid lubricants are used, it is called dry drawing. The purpose of removing the oxide scale is to prevent the oxidation of the drawn cast iron from damaging the surface of the mold and the metal wire, provide good surface conditions for subsequent coating or coating processing, and reduce friction and drawing force. There are two methods of descaling: chemical method and mechanical method.
