News - Cryogenic technology and cryogenic valves Cryogenic Treatment Equipment

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Home > News > Cryogenic technology and cryogenic valves Cryogenic Treatment Equipment

Cryogenic technology and cryogenic valves Cryogenic Treatment Equipment - 2013-12-12 10:35:34

Cryogenic technology is the use of a cooling medium as a refrigerant medium , the cooling process of the metal material after quenching continues , to a temperature well below room temperature (-196 ℃), the material properties of the metal so as to achieve the purpose of playing . Cryogenic processing technology in recent years, the rise of a new play metal workpieces performance technology, is currently the most effective and economical techniques.

In the deep cold process, the metal body of the large amount of residual transformed to martensite , especially supersaturated metastable martensite at room temperature from -196 ℃ to reduce over the course of saturation, precipitation dispersion , measuring only 20 ~ 60A and remain coherent relationship with the matrix of ultra-fine carbides , martensite lattice distortion can be reduced, the microscopic stress is reduced , while the dispersed carbides during plastic deformation may impede dislocation movement , thereby strengthening the matrix organization . And because of the ultra-fine particles uniformly distributed carbide precipitates in the martensitic matrix , weakening the grain boundary embrittlement , and fine matrix structure weakened both the degree of impurity elements in the grain boundary segregation , but also played a grain boundary enhanced , thereby improving the performance of the valve the mold , the hardness , impact toughness and wear resistance were significantly improved .

Improve the effectiveness of cryogenic technology is not limited to the work surface , which penetrate the interior of the workpiece , reflecting the overall effect, so the workpiece can be reground , re-use, and the role of the workpiece as well as reduce stress and enhance the quenching dimensional stability .

About the deep cold, cryogenic treatment finer dispersed carbide precipitation means - see pictures under the microscope : cryogenic , cryogenic treatment after Markov lath size significantly smaller , which means that the original coarse martensite lath in the deep cold , cryogenic treatment process of fragmentation occurs , fragmentation and low-carbon martensite cryogenic treatment caused the decomposition of martensite microstructure . Supersaturation in the deep cold, cryogenic treatment process, Markov at -190 degree temperature , due to the volume contraction of the lattice constant of Fe tends to shrink , while the low temperature solid solubility smaller increase in martensite also makes Ping Heng reduce the concentration of vacancies . These have increased the precipitation of carbon atoms in the segregation driving force , but the low temperature atomic motion difficulties , the diffusion distance is very short, the martensite supersaturated carbon atoms tend to segregate in the vicinity of the dislocation line in the subsequent process of gradually warmed formation of ultra-fine carbide core , after falling slightly martensite decomposition occurs , the internal dimensions smaller subunits : a low-carbon martensitic phenomena occur during quenching and tempering , some segregation of carbon atoms and has a fine carbide precipitation , but still the carbon α-Fe in a supersaturated solid solution. Cryogenic , cryogenic treatment to promote segregation of carbon atoms is more diffuse , ultra-fine carbides formed the core of martensite decomposition, increasing the martensite interfaces and shredding. Diffusion capacity of carbon atoms greatly increased in cryogenic temperature cryogenic treatment recovery stage, and with the temperature rise equilibrium vacancy concentration also increased, thus more movement accelerate diffusion of carbon atoms. Tempering produced from fine carbides promote polymerization carbide grown , cryogenic , ultra-fine carbides formed cryogenic treatment process and in the back room to keep warm gradually grew polymerization . Therefore, cryogenic , cryogenic treatment after the number of particles increases the martensite and carbides larger size .

Cryogenic Valves Cryogenic treatment effect:

Paralympic cryogenic treatment can change and improve the low-temperature hardness and wear resistance of the valve parts, stable workpiece size.

Cryogenic treatment may precipitate ultrafine carbides improve the wear resistance of the workpiece; refined grains can improve the toughness of the workpiece.

Cryogenic treatment can exponentially increase the corrosion resistance of martensitic stainless steel to improve polishing performance of the workpiece.

Cryogenic treatment can improve the conductivity of non-ferrous metals and corrosion resistance.

Cryogenic treatment can reduce mold deformation and cracking. Improve the dimensional accuracy of the workpiece.

Keywords:butterfly valve ,knife gate valve,ball valve,globe valve,slurry gate valve

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