Welded steel pipe is made of billet is steel plate or strip, because of the different welding process is divided into furnace welded pipe, welded (erw) tube and automatic arc welding tube. Because of its welding form of different can be divided into straight seam welded pipe and spiral welded pipe. Because of its shape is divided into circular welded steel pipe and alien (square, flat, etc) welded pipe.
Welded pipe because of its material and use different and divided into the following several varieties:
GB/T3092-1993 (low pressure fluid conveying with galvanized welded steel pipe). Mainly used for conveying water, gas and heating hot water or steam, air, oil and other general low pressure fluid tube and other purposes. It represents material for: Q235A steel.
GB/T3091-1993 (low pressure fluid conveying with galvanized welded steel pipe). Mainly used for conveying water, gas and heating hot water or steam, air, oil and other general low pressure fluid tube and other purposes. It represents material level Q235A steel.
GB/T14291-1992 (mine fluid conveying welded steel pipe). Mainly used for mine pressure, drainage, wind shaft gas with straight seam welded steel pipe. It represents material Q235A, B grade steel. GB/T14980-1994 (low pressure fluid conveying with large diameter welded steel pipe). Mainly used for conveying water, sewage, gas, low pressure fluid such as air, steam heating and other USES. It represents material level Q235A steel.
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