Compared with carbon steel, the commonly used steel for low-temperature alloy steel pipes has the advantages of high compressive strength, good comprehensive performance, long service life, wide application coverage, and relatively economic development.

Low-temperature alloy steel pipes generally use alloy structural steel and high-toughness alloy structural steel (GB/T1591-1994). Common materials for low-temperature pipes: Q345B, Q345C, Q345D, Q345E, A333 Gr6. Low-temperature alloy steel is mostly cold-rolled into plates, profiles, seamless pipes, etc., and is commonly used in highway bridges, ships, heating furnaces, cars and key building structures.

In addition to a certain amount of silicon or manganese basic elements, low-temperature alloy steel also contains vanadium (V), niobium (Nb), titanium (Ti), aluminum (Al), molybdenum (Mo), nitrogen (N), and rare earth ( RE) and other trace elements.