The steel used for low-temperature alloy tubes is compared with carbon structural steel. It has the advantages of high strength, good comprehensive performance, long service life, wide application range, and relatively economical. The steel is mostly rolled into plates, sections, seamless steel pipes, etc., and is widely used in bridges, ships, boilers, vehicles and important building structures.
Seamless steel pipe for low temperature pipeline
Spot specifications: 8-1240×1-200mm<1/8”—48”×SCH5S—SCH160, STD, XS, XXS>
Product material: 10MnDG, 09DG, 09Mn2VDG, 06Ni3MoDG,
ASTM A333-Grade1, Grade3, Grade4, Grade6, Grade7, Grade8, Grade9,
Product application: suitable for -45℃～-195℃ low-temperature pressure vessel pipes and seamless steel pipes for low-temperature heat exchanger pipes
Production process: cold drawn and hot rolled
Low-temperature alloy pipes generally use low-alloy high-strength structural steel (GB/T1591-1994)
In addition to a certain amount of basic elements of silicon or manganese, this type of steel also contains other elements suitable for my country’s resource situation. Such as vanadium (V), niobium (Nb), titanium (Ti), aluminum (Al), molybdenum (Mo), nitrogen (N), and rare earth (RE) and other trace elements. According to chemical composition and performance requirements, its grades are Q295A, B, Q345A, B, C, D, E, Q390A, B, C, D, E, Q420A, B, C, D, E, Q460C, D, E, etc. Steel grade means the same meaning as carbon structural steel.
V, Nb, Ti, Al and other grain-refining trace elements, in addition to A, B grade steel in this type of steel, the C, D, E grade steel should contain at least one of them; in order to improve the performance of steel , A and B grade steel can also be added to one of them. In addition, the residual element content of Cr, Ni, and Cu of this type of steel is not more than 0.30% each. Q345A, B, C, D, E are the representative grades of this type of steel, among which grades A and B are usually called 16Mn; steels above grade C need to add more than one trace element, and one additional low-temperature impact property is added to its mechanical properties.
Common materials for cryogenic pipes: Q345B, Q345C, Q345D, Q345E, A33Gr6