Roll cryogenic treatment equipment-imported technology, superior technology

2020-05-06 09:16:18

       Cryogenic treatment of rolls is cryogenic treatment of rolls. After quenching of the cold roll, a part of the mother phase will remain in the form of retained austenite. Only by continuing to lower the temperature to increase the driving force of the phase transformation can we continue to obtain martensite and reduce the residual austenite content. Cryogenic treatment is carried out by refrigeration equipment. Place the rollers in a freezing tank with four walls lined with insulation material, and the temperature of the rollers in the tank can be reduced to a temperature below -190 ° C by refrigeration. Simple cryogenic treatment can use ordinary freezer, the temperature can reach 18 ℃. If dry ice is used as the refrigerant, the temperature in the tank can reach -60C. Large rollers are generally cooled by a special vapor compression refrigerator. The temperature of the container can be reduced to -90 ° C. Conditional plants can also use liquid nitrogen to obtain a lower temperature below -190 ° C. This equipment adopts international superior temperature control technology, pre-set process time, processing time is controlled by the control system. The treatment effect can be judged by the metallographic actual measurement. The residual austenite content should be lower than the specified value, generally 8% -10% is allowed, and in strict cases it is required to be below 5%. Retained austenite is not as low as possible, but with the right amount is beneficial to toughness and accident resistance.

        The general application purpose is to enhance the wear resistance and dimensional stability of metal workpieces through cryogenic treatment / cold treatment, so that the service life of rolls, knives, cutting tools, molds, precision mechanical parts, oil nozzles, gears, bearings, etc. can be increased several times. . －196 ℃ liquid nitrogen cryogenic treatment can cause obvious changes in the structure, effectively promote the transformation of retained austenite to martensite and the precipitation of ultrafine carbides, so that the product obtains better comprehensive mechanical properties, and the service life of the product after cryogenic treatment It is more than four times higher than conventional heat treatment, and has very important use value.

  Nuoruida (Tianjin) science and Technology Co., Ltd. is committed to research, development, and sales of liquid nitrogen cryogenic equipment. Using European technology, we provide a variety of equipment. The main equipment is liquid nitrogen Cryogenic treatment equipment, cryogenic furnace, sub-zero processing equipment, low temperature cold assembly equipment, cryogenic freezing equipment, and so on.