dc53 DC53 die steel SKD11 make improvements is a new type of cold work die steel, the technical specifications set out in the Japanese Industrial Standards (JIS) G4404. It overcomes the deficiencies SKD11 tempering hardness and toughness of weakness, will replace SKD11 and precision molds in common areas. DC53 heat harder than SKD11, high temperature (520-530 ℃) after tempering up to 62-63HRC hardness, strength and wear resistance DC53 than SKD11. SKD11 of toughness is 2 times, DC53 cold die steel toughness in the more prominent tool DC53 made little cracks and cracking, greatly improving the service life. Residual stress after smaller line cutting through the tempering reduces residual stress, wire cutting and deformation after the crack can be suppressed. Cutting and abrasive than SKD11, DC53 cutting and abrasive than SKD11, DC53 can increase the use of the tool life and reduce mold manufacturing processes. 1 Purpose: 1. Chong planted mold, cold mold, cold drawn roll forming die 2. The punch line of precision stamping die cutting, precision blanking dies and stamping dies for various uses difficult materials cold plastic deformation tools forging, deep drawing and other high-speed Roll a die blanking punch, punch two stainless steel plates and practical features: (1) the machinability is good abrasive. Machinability, being abrasive than SKD11 are outstanding, so a longer tooling life, the number of working hours than the province. (2) the advantage on the heat energy is higher than the hardened SKD11, it is possible to improve the shortcomings of vacuum heat treatment hardness defects. Advantages (3) on the line cutting through the tempering reduce the residual stress and eliminate residual austenite can prevent wire cutting cracks, deformation of distress. (4) the advantage on the surface hardening of the surface treated hardened surface hardness than SKD11 high, it can improve the performance of the mold. (5) in the welding operations on the advantages of repair due to preheat and post heat temperatures lower than SKD11, so relatively simple repair welding operation. Nitriding treatment: a workpiece surface after a nitriding treatment to obtain a dense hardened layer organization, the wear resistance and corrosion resistance of the workpiece is significantly improved. After 525 ℃ gas nitriding surface hardness of about 1250HV, 570 ℃ soft nitriding surface hardness of about 950HV. 3 slightly heavier than the average density DC53 die steel, density of 7.9g / cm 3 4 chemical composition of carbon c: 1.00 Si Si: 0.91 Manganese Mn: 0.32 chromium Cr: 8.00 Mo Mo: 2.00 Vanadium V: 0.28 p: 0.0007 DC53 die steel 5 basic performance DC53 is SKD11 (Crl2MoV) based on the improvement of cold work die steel, heat treated under conventional conditions, almost all of the residual austenite decomposition, and can be omitted cryogenic treatment, under the strong still maintain high hardness and toughness . An experimental design DC53 1040 ℃ after quenching and tempering 520 ~ 530 ℃, up to 62 to 63 HRC hardness, toughness Crl2MoV twice, and is commonly used in cold work die steel of the highest current and cutting resistance, wear cut is good, small electric affected layer residual stress, minimal residual austenite, carbide small and evenly distributed. The force due to the mold situation is more complex, and some die working parts need to have some special mechanical properties, if the standard of the heat treatment process are often unable to achieve the desired performance requirements, the need by heat treatment of the basic characteristics of hardness, toughness and wear resistance for appropriate adjustments to achieve the best working condition die. Quenching temperature and tempering temperature is the main process parameters of heat treatment, this paper focuses on the DC53 tempering characteristics. Two experimental design experiments, DC53 heat slightly to make some changes in specifications, appropriate adjustments to the quenching temperature, tempering temperature to take a six-speed, that is 100 ℃, 200 ℃, 300 ℃, 400 ℃, 500 ℃, 600 ℃. 101-2 100 ℃ tempering chosen type oven heated, the rest of SX-25-12 box-type resistance furnace heating, tempering temperature is taken every two samples. Use metal hardness testing Rockwell hardness test, carried out at room temperature, using HBRVU-187.5-type optical Brinell hardness. Impact test using 10mm × 10mm × 55mm unnotched specimens, on JB30B impact testing machine, impact energy of 0.3 KN.m or 0.15 KN.m. Our products are accepted and passed strict quality tests, quality range, quality, price, delivery time and other characteristics, the majority of customers. To meet customer demand, we will continue to make unremitting efforts, the attitude of loyalty, efficient service for the purpose, to provide customers with better service!