Classification of Welded Steel Pipes

　　The billet used in welded steel pipe is steel plate or strip. It can be divided into furnace welded pipe, electric welded pipe and automatic arc welded pipe because of different welding technology. Because of its different welding forms, it can be divided into straight welded pipe and spiral welded pipe. Because of its end shape and tube. Mainly used for conveying water, gas, air, oil, heating hot water or steam and other general low pressure fluids and other purpose pipes. Its representative material is grade Q235A steel.

　　Galvanized welded steel pipe for low pressure fluid transportation. BS1387 Hot Dip Carbon Welded Steel Pipe mainly used for conveying water, gas, air, oil, heating hot water or steam and other general low pressure fluids and other purpose pipes. Its representative material is Q235A grade steel.

　　Welded steel pipe for fluid transportation in mine. Mainly used for mine air pressure, drainage, shaft gas drainage with straight seam welded steel pipe. Its representative material is grade Q235A and B steel. GB/T 14980-1994 (Large Diameter Welded Steel Pipe for Low Pressure Fluid Conveyance). It is mainly used for conveying low pressure fluids such as water, sewage, gas, air, heating steam and other purposes. Its representative material is grade Q235A steel.

　　Stainless steel welded steel pipes are used in mechanical structures. Mainly used for machinery, automobiles, bicycles, furniture, Hotel and hotel decoration and other mechanical parts and structural parts. Its representative materials are 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.

　　Stainless steel welded steel pipe is used for fluid transportation. Mainly used for conveying low-pressure corrosive media. The representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc.