Do you know How to Choose the Main Material of the Cryogenic Valve?

Cryogenic valve body material

(1) Factors to be considered in the selection of main materials

From the perspective of metallography, in addition to austenitic steel, copper, aluminum, etc. with face-centered cubic lattice, general steel materials will exhibit low-temperature brittleness at low temperatures, thereby reducing the strength and service life of the valve. When choosing the main material, first choose the material suitable for working at low temperature. Aluminum will not exhibit low-temperature brittleness at low temperatures, but because the hardness of aluminum and aluminum alloys is not high, and the aluminum sealing surface has poor wear resistance and scratch resistance, there are certain restrictions on its use in low-temperature valves. Optional for small diameter valves.

Materials that work at low temperatures must ensure their low-temperature performance, mainly to ensure their cold impact strength. The valve trim must be selected correctly to make it have sufficient cold shock strength to prevent fracture. C and Cr alloy steel loses its impact strength quickly when it is lower than -20°C, so the service temperature is limited to -30°C and -50°C, respectively.

Nickel steel with 3.5% Ni can be used at -100°C, and nickel steel with 9% Ni can be used at -192°C. Austenitic stainless steel, nickel, Monel, Hastelloy, titanium, aluminum alloy and bronze can be used to lower temperatures (-273°C). In addition, the material selection of cryogenic valves should also consider the following factors:

1) The minimum operating temperature of the valve;

2) The mechanical properties of metal materials required to maintain working conditions at low temperatures, especially impact toughness, relative elongation and structural stability;

3) In the case of low temperature and no oil lubrication, it has good friction resistance;

4) Has good corrosion resistance;

5) When using welding connection, the welding performance of the material should also be considered.

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