Yong Wei steel mold (Dongguan) Co., S7 rod, S7 is provided by Yong Wei steel mold (Dongguan) Limited. We are a steel mold, Dongguan City, An Yongwei shop (www.dgyongwei.com) located at: Dongguan specializes in: mold steel, DC53, SKD11.SUS440C, SUS420 cold work die steel is mainly used in the manufacture of the workpiece cold state repression molding mold. Such as: cold punching dies, cold stamping die, cold drawing dies, embossing dies, cold extrusion dies, molds and pressed powder compaction thread mold. Cold work die steel range is very wide, from a variety of carbon tool steel, alloy tool steel, high speed tool steel to powder high speed tool steel and high-alloy tool steel powder. Cold work die steel with fine steel vacuum degassing, endoplasmic pure S7, good machinability, cutting significantly improved hardenability good air hardening steel less prone to quench cracking S7, S7 very excellent wear supplier , good toughness, can be used as stainless steel and high hardness of the material blanking die. Vacuum heat treatment technology is developed in recent years a new type of heat treatment technology, it has the characteristics of mold manufacturing is urgently needed, such as to prevent oxidation and decarburization heating, vacuum degassing or outgassing, eliminating embrittlement, thereby improving material (parts) ductility, toughness and fatigue strength. Vacuum heating is slow, small temperature difference between inside and outside parts and other factors, determines the vacuum heat treatment process caused by deformation and small parts. The chemical composition of the number of die steel rod S7, grain size, purity, carbides and inclusions, morphology, size and distribution, as well as the microstructure, such as heat after heat treatment systems and the factors resulting mold steel have a great impact on the toughness of the steel. In particular purity and thermal processing of steel deformation transverse impact toughness is more obvious. Toughness, strength and wear resistance are often conflicting. Therefore, a reasonable choice of the chemical composition of the steel and the use of reasonable refining, thermal processing and heat treatment processes to make the mold material wear resistance, strength and toughness to achieve the best fit.