What is the material of seamless steel tube for low temperature?

General low temperature refers to the range of -20℃--196℃.
Low temperature is deep low temperature, ultra-low temperature, in petrochemical enterprises less application.

For the choice of seamless steel tube materials, the range of -20℃~-1969C can be divided as follows:
Carbon steel pipe should not be used at -20℃~-40℃;
Low alloy steel pipe should not be used at -40℃~-70℃;
General alloy steel pipe should not be used at -70℃--196℃;
Low carbon ordinary stainless steel pipe should not be used below -196℃;

General Requirements for the selection of low-temperature pipe materials Due to the low-temperature pipe material kneeling, causing the risk of pipe system fracture, so in the medium temperature is lower than or equal to -20℃ pipeline, its components should be selected according to the impact performance requirements.
Generally, the following requirements should be met.
(1) The steel used for low-temperature pipes under pressure shall be composed steel.
(2) When the service temperature of carbon steel and low-alloy steel tube is lower than or equal to -20%, the service state and the minimum impact test temperature shall comply with the relevant provisions.