Commonly used 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 further divided into straight seam and spiral seam pipes based on their welding forms. Additionally, they are classified into round straight seam pipes and special-shaped (square, flat, etc.) pipes depending on the shape of their ends. Straight seam pipes are further categorized into various types based on their material and application.

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

GB/T14291-2006 (Mine Fluid Transportation Welded Steel Pipe). Primarily used for mine ventilation, drainage, and shaft gas release with straight seam welded steel pipes. The representative material is Q235A, B-grade steel. GB/T14980-1994 (Large Diameter Electric Welded Steel Pipe for Low-Pressure Fluid Transportation). Mainly used for transporting water, wastewater, gas, air, heating steam, and other low-pressure fluids, as well as other applications. The representative material is Q235A-grade steel.