DC-Series Programmed Cryogenic Equipment is developed mainly to meet different requirements for cooling rate of low temperature treatment, lonneal and aging/stress relief of metal or sample frozen. DL-Series, using the latest heating, thermoregulation technology, liquid Nitrogen scatter, make the programmed temperature, constant temperature, cooling procedures are quite stable. Using liquid Nitrogen as freezing medium, DL-Series meet the requirements of cooling and environmental protection. Our products have several shapes such as horizontal, vertical, square, circle, etc. We can also design and manufacture according to the special requirements of the customers. Our products can be used in following areas: Mechanical Engineering, Genetics Engineering, Medicine, Food Production, Medical Research, Preservation of Plant, Aerospace Engineering,Raising Animals, Etc. . These series of products can widely be applied to various industries home and abroad. The common purpose of applying is to strengthen abrasive resistance, dimensional stability of metal working piece and to increase service life of cutter, cutlery, mould, precision mechanical parts, nozzle, gear, bearing several times. -196°C liquid nitrogen cryogenic treatment can change the metal structure dramatically and cause remaining austenite to be transferred to martensite effectively and superfine carbide precipitation so as to make the products get better synthesized mechanical property. The method of cryogenic treatment can increase the service life of products 4 times more than the one of routine thermal treatment so cryogenic treatment has very important application value