Common thick-walled straight seam welded pipe materials and applications

Common materials for thick-walled straight seam welded pipes include: Q235A, Q235C, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X60, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.

Thick-walled straight seam welded pipes are made from steel plates or strips, and are categorized into furnace welded pipes, electric welded (resistance welded) pipes, and automatic arc welded pipes due to their different welding processes. They are divided into two types based on their welding forms: straight seam and spiral seam pipes. Additionally, they are classified into round straight seam pipes and non-standard (square, flat, etc.) pipes according to their end shapes. Straight seam pipes are further divided into several varieties due to their materials and applications:

GB/T3091-2008 (Galvanized Welded Steel Pipe for Low-Pressure Fluid Transportation). Primarily used for conveying water, gas, air, oil, heating hot water, or steam, among other general low-pressure fluids and for various other piping applications. The representative material is Q235A steel.

GB/T14291-2006 (Fluid Conveyance Welded Steel Pipes for Mining). Primarily used for straight seam welded steel pipes in mining applications such as compressed air for ventilation, drainage, and shaft gas venting. The representative material is Q235A, B-grade steel. GB/T14980-1994 (Large Diameter Electric Welded Steel Pipes for Low-Pressure Fluid Conveyance). Mainly used for conveying low-pressure fluids like water, sewage, gas, air, heating steam, and other applications. The representative material is Q235A-grade steel.