Welded steel pipe is bent with steel or steel plate is round, square and other shapes and then welded into the surface of the seam with the steel pipe. The billet used for the welded steel pipe is steel or strip. According to the welding method can be divided into different arc welding pipe, high frequency or low frequency resistance welded pipe, Welded Steel Pipes gas pipe, furnace pipe, Bundy tube. Welded steel pipe: for oil drilling and machinery manufacturing industry. Welded pipe: can be used as water and gas pipes, large diameter straight seam welded pipe for high pressure oil and gas transportation; spiral welded pipe for oil and gas transportation, pipe piles, piers and so on.
Welded steel pipe according to the process of high-frequency straight seam welded pipe, spiral welded pipe, seamless steel pipe, Welded Steel Pipes according to the different materials are stainless steel pipe, galvanized pipe, non-ferrous metal pipe, carbon steel pipe, according to the thickness can be divided into thin wall, Wall tube, thick-walled tube and so on.
Welded steel pipe due to its different materials and uses are divided into the following varieties:
GB / T3091-1993 (galvanized welded steel pipe for low pressure fluid delivery). Mainly used for conveying water, gas, air, oil and heating hot water or steam and other general lower pressure fluid and other use pipe. Welded Steel Pipes Its representative material Q235A grade steel.
GB / T14291-1992 (Mine fluid transport welded steel pipe). Mainly used for mine pressure, drainage, shaft gas with straight seam welded steel pipe. Its representative material Q235A, B grade steel. GB / T14980-1994 (Large Diameter Welded Steel Pipe for Low Pressure Fluid Transportation). Welded Steel Pipes Mainly used for conveying water, sewage, gas, air, heating steam and other low-pressure fluid and other uses. Its representative material Q235A grade steel.
GB / T12770-1991 (stainless steel welded steel pipe for mechanical construction). Mainly used in machinery, automobiles, bicycles, furniture, hotels and hotel decoration and other mechanical parts and structural parts. Its representative material 0Cr13,1Cr17,00Cr19Ni11,1Cr18Ni9,0Cr18Ni11Nb and so on.
GB / T12771-1991 (stainless steel welded pipe for fluid delivery). Mainly used for conveying low-pressure corrosive media. Representative material is 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, Welded Steel Pipes 0017Cr17Ni14Mo2 and so on.