Material selection of cryogenic valve parts
Under the condition of low temperature, the tensile strength and hardness of the material are increased, the plasticity and toughness are decreased, and the material presents different degrees of low temperature brittleness, which seriously affects the normal operation of the low temperature valve. Therefore, in the selection of low temperature valve parts and materials, we must pay attention to the following points:
(1) the minimum operating temperature of the low temperature valve;
(2) Mechanical properties necessary to ensure that the parts do not lose their working ability at low temperatures, especially low temperature impact toughness, relative elongation and tissue stability;
(3) ensure that the parts meet the compatibility conditions of low-temperature medium explosion-proof,
(4) ensure the necessary thermal and physical properties of the parts, including thermal conductivity, cold shrinkage performance, etc.;
(5) Ensure that the parts have the necessary wear resistance under the condition of low temperature and oil-free lubrication;
(6) Ensure that the parts have the necessary corrosion resistance;
(7) The welding performance of materials should also be considered when welding.
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