Pneumatic pneumatic - valve Austenitic stainless steel pneumatic valve application in low temperature

austenitic stainless steel is under the condition of using austenitic organization or to give priority to with austenitic organization of stainless steel. Austenitic stainless steel has the many kinds of superior performance, can be used in various fields, especially excellent low temperature toughness of as low temperature structural materials is widely applied in cryogenic engineering. At present, the cryogenic austenitic stainless steel is chosen mostly pneumatic valve manufacturing. Cryogenic pneumatic valve working medium low temperature not only, and most or toxic or flammable and explosive, and permeability is strong, therefore determines how many special requirements for pneumatic valve material. ( l） Good low temperature resistance cryogenic pneumatic valve required in setting temperature can not only work, but also to ensure the work performance at room temperature. Therefore, the selected material should not only meet the room temperature mechanical properties, and meets the requirement of use temperature on mechanical properties. Especially for material under ultra-low temperature should have enough toughness to prevent brittle fracture under low stress. Also require stable material organization, ensure that in use process will not caused by phase change size change, eventually led to the pneumatic valve seal failure. ( ） Compatibility with medium cryogenic pneumatic valve material shall be compatible with the working medium, which is enough for medium chemical resistance, ensure pneumatic valve in use within the time limit, in contact with the media materials of chemical and physical properties will not change significantly. At the same time, the pneumatic valve material also should comply with the compatible conditions of low temperature medium anti explosion. ( ） Low thermal conductivity because of low working temperature of cryogenic pneumatic valve to reduce the heat transfer, heat leakage control, pneumatic valve in addition to the use of special structure ( Set the adiabatic device) Outside, still should choose material thermal conductivity is relatively low, in order to reduce heat loss. ( ） Good welding performance forge welding structure of the pneumatic valve body materials or butt welding of the pneumatic valve body materials, welding performance of material should be considered and the reliability of the weld in the use of temperatures. Special alloy deposition ( Like a Cr W carbide) Should also be considered, the sealing surface of the material itself male welding ( Spray welding) The feasibility of. , through analysis and Nl 'centered cubic lattice, such as copper, aluminum alloy and austenitic stainless steel material, because without low temperature brittleness phenomenon, therefore, can be used as cryogenic pneumatic valve material. Although copper, aluminum alloy has certain advantages, but due to the low strength, only commonly used in low pressure and small pneumatic valves. And although % nickel steel can be used in the working condition of the oC, due to the complex process, general rarely use. Austenitic stainless steel is only suitable for various specifications, different pressure levels of cryogenic pneumatic valve material.
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