LCC material and SS304 disc Check valves dated July. 14, 2019
cryogenic valve
The definition of low temperature valves in the petrochemical industry is based on the design temperature of the conveying medium. Generally, the valves applied to the medium temperature below -40 ℃ are called cryogenic valves, and the valves applied to the medium temperature below -101 ℃ are called ultra-low temperature valves.
The working medium of low temperature valves is not only low in temperature, but also most of them are toxic,flammable, explosive, and highly permeable, which determines many special requirements for valve materials.
The mechanical properties of steel at low temperature are different from those at normal temperature.
In addition to strength, the most important indicator of steel for low temperature is its low temperature impact toughness.
The low-temperature impact toughness of a material is related to the brittle transition temperature of the material.
The lower the brittle transition temperature of the material, the better the low-temperature impact toughness of the material.
Metal materials with body-centered cubic lattices, such as carbon steel, have low-temperature cold brittleness, while metal materials with face-centered cubic lattices, such as austenitic stainless steel, are not affected by low-temperature impact toughness.
Post time: May-29-2020