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, classified into furnace-welded, electric-welded (resistance welded), and automatic electric arc-welded pipes due to different welding techniques. They are further divided into straight seam and spiral seam pipes based on the welding form, and into round straight seam and non-standard (square, flat, etc.) pipes due to their end shapes. Straight seam pipes are further categorized into several types based on material and application:

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

GB/T14291-2006 (Mine Used Fluid Conveyance Welded Steel Pipe). Primarily used for mine ventilation, drainage, and shaft gas venting 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 Conveyance). Mainly used for conveying water, wastewater, gas, air, heating steam, and other low-pressure fluids, as well as other applications. The representative material is Q235A-grade steel.