Siu promise commerce Limited Profile DC53 DC53 the strength toughness under appropriate heat treatment are excellent line cutting residual stress after processing, the high-temperature tempering reduce the residual stress. Therefore, large molds and precision molds online crack after cutting and deformation is suppressed. Practical features: Online cutting the processing of advantages by high temperature tempering reduce the residual stress and the elimination of retained austenite, to prevent the wire cutting cracks, deformation of the troubled. DC53 die steel [1] uses ● precision stamping dies. ● wire cutting precision blanking dies and various uses stamping die. ● difficult to machine materials of plastic deformation tools. ● forging, deep drawing and thread rolling with mold. ● High speed blanking punch, stainless steel plate punch. ● factory state: HB255 chemical composition Carbon C: 1.00 Silicon Si: 0.91 Manganese Mn: 0.32 chromium Cr: 8.00 Mo Mo: 2.00 vanadium V: 0.28 phosphorus p: 0.007 basic performance DC53 SKD11 (Crl2MoV) based on improved cold die steel, conventional heat treatment conditions, the residual austenite almost all of decomposition, generally be omitted cryogenic treatment, can still maintain a strong hardness, high toughness. An experimental design DC53 after quenching at 1040 ℃ and 520 ~ 530 ℃ high temperature tempering, hardness HRC up to 62 to 63 toughness twice Crl2MoV, the common cold die steel, and the cutting, grinding good machinability, small residual stress of the electrical processing deterioration layer, very little residual austenite, carbide fine and evenly distributed. More complex mold by the force of circumstances, some die working parts need to have some special mechanical properties, standard heat treatment process are often unable to achieve the desired performance requirements, the need for basic characteristics such as hardness, toughness and wear resistance by heat treatment appropriate adjustments to achieve the mold top working condition. Quenching temperature and tempering temperature is the main process parameters of heat treatment, the paper focuses on the tempering characteristics of DC53. The experimental design experiments, DC53 heat treatment specification slightly to make some changes, appropriate adjustments to the quenching temperature, tempering temperature of 6-speed, ie 100 ° C, 200 ° C, 300 ° C, 400 ° C, 500 ° C, 600 ° C. 100 ℃ tempering selected the 101-2 type oven heating, the rest of the SX-25-12 box-type resistance furnace heating, each tempering temperature taken two specimens. Hardness testing selected metal Rockwell hardness test, at room temperature, HBRVU-187.5 the Burawoy optical hardness tester. The impact test 10mm × 10mm × 55mm unnotched specimen on in JB30B impact testing machine, impact energy of 0.3 KN.m or 0.15 KN.m. Experimental results and analysis ⒈ hardness values ??for each sample from each of the three different locations of points measured hardness, the hardness values ??come under various tempering temperature, the comprehensive sample hardness values, DC53 100 ~ 500 ℃ tempering, hardness values ??did not change; 400 ℃ temperature tempering hardness slightly higher standard heat treatment after tempering hardness peak is generally about 520 ℃; dropped after high-temperature tempering at 600 ℃, the hardness, the average HRC hardness value only 52.4 tempering temperature is not too high. ⒉ impact toughness tempering after the oxidation of the sample surface decarburized layer is rubbed off, to measure the impact value of each sample in the different tempering temperatures, various impact values ??of the sample, DC53 tempering of 200 ° C, the average impact value reached more than 60 J/cm2. 500 ℃ tempering, impact toughness, the performance of some of the high-temperature tempering. Above 600 ℃ tempering impact toughness is good, but the hardness dropped significantly, reach requirements. The experimental results show that the stability of the, the DC53 overall tempering better in certain tempering temperature range, the hardness and impact value little changed; toughness when tempering at 400 ~ 500 ℃ dropped significantly, the phenomenon of temper brittleness; at 600 ℃ tempering, the high toughness of the test piece, the impact value of 85 J/cm2, but the hardness is substantially decreased. High-temperature tempering can be used in production, for hardness, abrasion resistance requirements are not too high, higher toughness requirements of cold work die; higher hardness requirements, while higher toughness cold working die, should be adopted about 200 ℃ low temperature tempering. The other tempering temperature hardness and shock value calculation method can be used (such as interpolation, function approximation) prediction with experimental verification. The quenched sample carbide was the intermittent fine banded 200 ℃ tempered carbides evenly distributed, large blocky carbides are almost non-existent organization, it is better toughness. From the fracture morphology, fracture cleavage steps of 200 ° C tempering organization is far less than the quenched specimen fracture 5,000 times metallographic some small shallow dimples show its toughness. After tempering, the residual austenite more fully, a fine and uniform distribution of carbides, so that the increased toughness. Conclusion ⒈ appropriate adjustments quenching temperature, DC53 200 ℃ tempering hardness and impact toughness higher; higher hardness at 400 ~ 500 ℃ tempering toughness dropped significantly; impact toughness high tempering at 600 ℃ , hardness significantly decreased. ⒉ complex shape precision die, trimming die, cold roll round tooling cryogenic tempering process should be adopted, so that the mold parts to obtain high hardness, high toughness, good wear resistance, high strength, can effectively extend the life of the die to prevent excessive wear, deformation, cracking and early failure of the phenomenon. ⒊ under the impact load large complex molds the low quenching high-back process can be used to get a high impact toughness, hardness prevent mold to produce the mechanical properties of brittle fracture phenomena: annealing, 255 to 210HB, quenching, ≥ 62HRC of dc53 mold steel characteristics ( 1) is cutting, abrasive. Machinability, abrasive than that SKD11 excellent processing tool life longer processing time compared Province. (2) on the advantages of the heat treatment quench hardening than SKD11 high vacuum heat treatment can be improved when the defect of insufficient hardness. (3) online on the cutting advantages by high-temperature tempering can reduce the residual stress and the elimination of retained austenite, to prevent the wire cutting cracking, deformation of distress. (4) in the surface hardening treatment, the advantage of the surface hardening treatment after the surface hardness is higher than SKD11, thus improving tool performance. (5) in the repair welding operations on the advantages of the preheat and post-heat temperature than SKD11 low, so the repair welding operation is simple. Features: The common cold die steel, high hardness, high toughness DC53 die steel dc53 die steel use wire cutting precision blanking dies and various uses stamping die. Difficult to machine materials, plastic deformation tools. For forging, deep drawing and thread rolling die. Punch speed blanking punch, stainless steel plate