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Category: industrial freezer
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Basis of cold treatment process
Cold treatment, also known as cold treatment, sub zero treatment and cryogenic treatment, is to continue cooling the steel parts quenched to room temperature at a temperature below MS, which is generally – 60 ~ – 190 ℃, so that the austenite transformation at room temperature has not completed transformation into martensite. The purpose of… Read more Basis of cold treatment process
cold treament
After quenching at the most appropriate temperature, the tool should be cooled to the temperature of the surrounding medium before cold treatment. In order to obtain the best effect of cold treatment, the following conditions must be observed: for high speed steel, the time interval between complete cooling to room temperature after quenching and before… Read more cold treament
Cooling before cold treatment
In the research work from 1945 to 1946, the effect of cooling rate from 180 ℃ to 20 ℃ was studied. The research on the specimen with special shape shows that, in the above temperature range, what kind of cooling conditions will usually form cracks, and what kind of cooling conditions will not form cracks.… Read more Cooling before cold treatment
Sclerosis
High speed steel that should be cold treated may be hardened in accordance with the usual practice for that steel. During the actual heat treatment, the P8 steel tool is heated in the range of 1260 ~ 1290 ℃, while the P9 steel tool is heated in the range of 1220 ~ 1240 ℃. It… Read more Sclerosis
cold treatment schemes studied
The following conclusions can be drawn from the work done: 1. From all the cold treatment schemes studied, it is not found that the cutting performance of the tool has any significant improvement over that of the tool with normal hardening and three times of firing. 2. Under the following conditions, cold treatment can significantly… Read more cold treatment schemes studied
Cryogenic treatment is actually the continuation of quenching
In addition to strengthening the forging process, a cryogenic treatment process is added to the normal die heat treatment. Cryogenic treatment is actually the continuation of quenching, which uses the degree of subcooling to increase the driving force of martensite transformation. As the cryogenic temperature decreases and the degree of undercooling increases, the transformation of… Read more Cryogenic treatment is actually the continuation of quenching
Industrial cold treatment of steel
Metallographic structure: tempered martensite + carbides + retained austenite, in which the content of retained austenite is large, the size of carbides is uneven, and some particles are larger, and the large carbides also have edges and corners. Cr12MoV steel belongs to ledeburite steel. Although the large eutectic carbon compounds have been crushed during forging,… Read more Industrial cold treatment of steel
Cr12MoV steel cold heading die cryogenic treatment
Cr12MoV steel has high carbon content and chromium content, can form a large number of carbides and high-alloy martensite, so that the steel has high hardness and high wear resistance. At the same time, chromium also makes steel have high hardenability and tempering stability. Molybdenum increases the hardenability of steel and refines the grains. Vanadium… Read more Cr12MoV steel cold heading die cryogenic treatment
Cryogenic treatment process of mold conventional heat treatment
1.1040°C quenching and 580°C twice tempering, deep cooling (-196°C×24h), 150Cx30min tempering, nitriding 2.1040°C quenching and 590°C twice tempering, deep cooling (-196°C×24h), 100°Cx3omin tempering, nitriding. Two sets of molds for cryogenic treatment were used in another aluminum profile factory, and the production volume reached 9.2 tons per set. Calculated according to the quality standard of 0.1mm… Read more Cryogenic treatment process of mold conventional heat treatment