SKD61 tool steel [About how to choose the right mold steel Use mold steel to meet the working conditions, working conditions of the process performance requirements and economic requirements requirements: abrasion, plastic deformation of the dough in the mold cavity substantially in the selection, along The cavity surface of the flow and slide, so that the mold cavity surface with the blank to produce intense friction, causing mold and failure due to wear, so the basic mold wear, one of the most important performance. The hardness of the main factors affect the wear resistance, under normal circumstances, the higher the hardness of the mold parts, wear two smaller, the better the wear resistance. In addition, the wear resistance material carbide type, quantity, shape, size and distribution. Strength and toughness: Under normal circumstances, the working conditions of the mold is very bad, sometimes withstand greater impact loads, resulting in brittle fracture. To prevent a sudden brittle fracture at work when the mold parts, the mold having a high strength and toughness. Resilience Resilience of the mold depends mainly on the carbon content of the material, grain size and organization of the state. Fatigue fracture properties: die working process, the long-term effects of the amount of cyclic stress often leads to fatigue fracture in the form of a small energy repeated impact fatigue fracture, tensile fatigue fracture, contact fatigue fracture and bending strength and toughness. Fatigue fracture properties of the mold depends primarily on its strength, toughness, hardness and material inclusions content. Temperature performance: the higher the operating temperature of the mold will cause the hardness and strength decrease, leading to early wear of the mold or plastic deformation and failure. Thus, the mold material should have high temper resistance, to ensure that the die at the working temperature, having a high hardness and strength. Resistance to thermal fatigue properties: some mold in the work process is repeated heating and cooling state, so that the cavity is subject to tension, pressure, alternating stress, causing the surface cracking and peeling, increased friction, hinder plastic deformation, reducing the dimensional accuracy of the resulting die failure. Hot work die failure of one of the main forms of thermal fatigue, of such mold should be a higher resistance to thermal fatigue performance. Corrosion resistance: some molds such as plastic mold, plastic work due to the presence of chlorine, fluorine and other elements, and after the heat will break precipitated HCI, HF and other strong invasion gas erosion of the surface of the mold cavity, to increase its surface roughness, exacerbate wear lapse. SKD61 tool steel, how to use? SKD61 is a high-carbon high-chromium alloy tool steel, heat treatment has a high hardness and wear resistance, hardenability, good dimensional stability, suitable for production of high-precision long-life cold work die and thermosetting molding plastic mold. The thickness of not more than 2MM sheet, efficient blanking die, rushed out mold and pressure die. A variety of scissors, inlaid blades, woodworking blade. Thread rolling die and wear slider. Cold Heading Die thermosetting resin molding. Molding, deep drawing cold extrusion dies. SKD61 Hardness: prior to the heat treatment, the hardness of HRC15 to 20 (HB200 to 230) after the heat treatment SKD61: Internal HRC40 ° to 45 ° surface HV1000 ± 100 SKD61 density is 7.85g per cubic centimeter the SKD61 heat treatment method (1): Quenching: Preheat the stage: the second stage of 500 to 550 ° C Preheat: 750 to 800 ° C Hair cooling or high-pressure gas cooling from 100 to 150 ° C into the furnace. Tempering: Preheat: 300 to 350 ° C tempering heating: 550 to 680 ° C air cooled to room temperature, tempering three times. Quenching temperature from 1000 to 1050, hardness 50 ~ 55HRC, heat deformation small, surface nitriding nitriding processing out of the product has better wear resistance. SKD61 deep hot and cold processing method (2): In order to obtain the highest hardness and dimensional stability, the mold immediately after quenching cryogenic -70 to -80 ° C and maintained for 3-4 hours, and then in the tempering treatment, by cryogenic treatment, tool or mold hardness than conventional heat treatment hardness high the 1-3HRC. Complex shape and size changes in the larger parts, the cryogenic treatment production risk of cracking the SKD61 nitride treatment (3): the mold or the workpiece, the hardened layer formed on the surface layer with high hardness and corrosion resistance after nitrogen treatment organization. Hardness: annealing, 235 to 205HB, quenching, ≥ 50HRCV the Shanghai Hai extension SKD61 mold steel spot sales specifications circle (mm): 10/13-20-45-50 160-200 250-350 flat (mm): 26 * 32 -38-45-50-65-70-90-105-130-155-185-205-260-305-360-410-460 2832-38-45-50-65-70-90-105-130 - 155-185-205-260-305-360-410-460 32 * 32-38-45-50-65-70-90-105-130-155-185-205-260-305-360-410-460- 35 * 32-38-45-50-65-70-90-105-130-155-185-205-260-305-360-410-460 38 * 32-38-45-50-65-70-90 -105-130-155-185-205-260-305-360-410-460 45. * 32-38-45-50-65-70-90-105-130-155-185-205-260-305 - 360-410-46050 * 32-38-45-50-65-70-90-105-130-155-185-205-260-305-360-410-460 60 * 32-38-45-50 - 65-70-90-105-130-155-185-205-260-305-360-410-460 70 * 32-38-45-50-65-70-90-105-130-155-185-205 -260-305-360-410-460 80 * 32-38-45-50-65-70-90-105-130-155-185-205-260-305-360-410-460 100 * 32-38 -45-50-65-70-90-105-130-155-185-205-260-305-360-410-460 200 * 32-38-45-50-65-70-90-105-130 - 155-185-205-260-305-360-410-460