Because the one-time hardening method adopts low temperature tempering, although the hardness can reach HRC60 or more, the tempering temperature is low, the stress relief after quenching is not sufficient, and it is easy to reduce the surface hardness of the workpiece due to the grinding heat in the subsequent processing and affect the service life .

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High temperature quenching 1100-1150℃, low temperature quenching 960-1050℃, tempering 550-650℃, the former has secondary hardening phenomenon, tempering is not less than 2 times, each 2h, after tempering, it can be air-cooled or oil-cooled, high temperature It is best to preheat twice before quenching. When heating at high temperature, protective measures should be taken to prevent oxidation.

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Cr12 die steel belongs to high carbon and high chromium ledeburite steel, and it is also a widely used cold work die steel. The steel has good hardenability, wear resistance, and hot workability. Carbides are well distributed in steel and can be used It is used to manufacture various cold work molds with complex shapes and heavy working conditions, such as cold die punches, thread rolling dies, wire drawing dies, material molds, metallurgical powder molds, woodworking cutting tools, cold cutting scissors drill sleeves, gauges and other tools. In our research and development, after repeated exploration and testing, we have formulated a reasonable smelting process and a special ingot mold and forging process to achieve a uniform and consistent material structure. In addition, we have boldly innovated the standard material processing and adopted the new technology of double-knife chipping. The efficiency is greatly improved, the cycle is shortened, and the cost is reduced.

Cr12 is an alloy tool steel with good hardenability and good wear resistance. It is mainly used for cold punching dies and punches, cold cutting scissors, drill sleeves, gauges that bear less impact load and require high wear resistance. , Wire drawing die, stamping die, thread rolling board, drawing die and thread rolling die, etc.

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Cold work die steel is mainly used in the processes of punching, stretching, bending, cold extrusion, cold heading, thread rolling, and bending of metal or non-metal materials. Therefore, the mold is required to have high strength, high wear resistance and sufficient toughness to ensure its service life. As a general-purpose cold work die, Cr12 steel is widely used in mass production, and there are usually two heat treatment methods: primary hardening (low quenching + low recovery) and secondary hardening (high quenching + high recovery).

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The quenching temperature of the one-time hardening method is 1020～1040 degrees, and the tempering temperature can be selected according to the requirements of the mold. Generally, cold stamping dies that require high hardness and wear resistance are tempered at a low temperature of 160 to 180 degrees, and the hardness can reach HRC60 or more after tempering. . For stamping dies that require higher hardness and a certain degree of toughness, 250-270 degree tempering can be used, and the hardness can reach HRC58-60 after tempering. For molds with higher impact and toughness, 520 degrees high temperature tempering can be used, and the hardness after tempering is HRC55-57.

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The quenching temperature of the secondary hardness method is 1080 ~ 1120 degrees. Because there is a large amount of retained austenite in the steel after quenching, the hardness is low (HRC 42 ~ 45). After multiple (3 ~ 5 times) high temperature tempering, the residual The transformation of austenite into martensite produces secondary hardening. The hardness can be increased to HRC59~64, which is mainly suitable for mold parts that require red hardness. The disadvantage is that the impact toughness is poor, which affects the multi-stroke life, so it is not suitable for cold work molds.

Therefore, the medium temperature quenching + high temperature tempering method is preferred, that is, the quenching is about 1050 degrees, and the hardness after quenching is HRC63. Then use 500-520 high temperature tempering. Since the hardness of the secondary hardening and tempering can reach above HRC60, the quenching temperature of this process is lower than that of the secondary hardening method, and the strength of the mold after heat treatment is higher, and it has a certain degree of toughness. Moreover, due to the sufficient stress relief after high temperature tempering, the following advantages of wire-cutting electric discharge machining are not easy to crack, not easy to anneal during grinding, and the surface can be plated with titanium, etc., which have certain applications in production.