Commonly used welded pipe materials are: Q235A, Q235C, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X60, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.
The billet used for welding steel pipe is steel plate or strip steel, which is divided into furnace welded pipe, electric welding (resistance welding) pipe and automatic arc welding pipe because of its different welding process. Because of its different welding forms are divided into straight seam welded pipe and spiral welded pipe two kinds. Because of the shape of its end, it is divided into circular welded pipes and special-shaped (square, flat, etc.) welded pipes. Welded pipes are divided into the following varieties because of their different materials and uses:
GB/T3091-2008 (Welded steel pipe for low pressure fluid transportation) : mainly used for conveying water, gas, air, oil and heating hot water or steam and other general low pressure fluids and other purposes. Its representative material is: Q235A grade steel.
GB/T14291-2006 (Welded steel pipe for mining fluid transport) : mainly used for straight seam welded steel pipe for mining air pressure, drainage and shaft gas discharge. Its representative material Q235A, B grade steel.
GB/T12770-2002 (Welded stainless steel pipe for mechanical structure) : mainly used in machinery, automobiles, bicycles, furniture, hotel and restaurant decoration and other mechanical parts and structural parts. Its representative material 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb and so on.
GB/T12771-1991 (Welded stainless steel pipe for fluid transportation) : mainly used for conveying low-pressure corrosive media. The representative material is 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc.