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Home > Products > Welded steel pipeWelded steel pipe

Welded steel pipe refers to the bending deformation of the steel strip or steel sheet as round, square and other shapes and then welded into the steel pipe, the surface of the seam. Welded steel pipe production process is simple, high production efficiency, different specifications, equipment owned, but the general strength less than seamless steel pipe. Since the 1930s, with the progress of quality steel rolling production the rapid development of welding and inspection techniques, weld quality and continuously improve, welded steel pipe increasing number of varieties and specifications, and in more and more areas instead of pipe joints.
Welding method can be divided into different arc welded pipe, high or low frequency electric resistance welded pipe, gas pipe, stove pipe, Bundy tube. Longitudinal and spiral welded pipe weld shape can be divided into.
Welded steel pipe used for oil drilling and machinery manufacturing. The furnace can be used as a water pipe and gas pipe, large diameter welded pipe used for high-pressure oil and gas transmission; spiral welded pipe for oil and gas transmission pipe piles, piers. The welded steel pipe is lower than the cost of seamless steel, high production efficiency. Longitudinal production process is simple, high efficiency, low cost, rapid development. The strength of the spiral welded pipe Longitudinal generally higher than can narrow the billet production of large diameter pipe, you can use the same width of the billet production of different diameters of pipe. However, compared with the same length of straight pipe joints, weld length of 30 to 100%, and lower production rate. Therefore, most of the smaller diameter pipe straight seam welded pipe of large diameter are mostly spiral welded.

welded steel pipe blank steel sheet or strip, its different welding process is divided into the furnace pipe, welding (ERW) pipe and automatic arc welded pipe. Its the welding forms of different divided into two kinds of Longitudinal and spiral welded pipe. Because of its ends is divided into the shape of circular welded pipe and shaped (square, flat, etc.) pipe. Pipe because of its material and for different purposes is divided into the following varieties:
GB/T3091-1993 (low pressure liquid delivery galvanized welded steel pipe). Mainly used for conveying water, gas, air, oil and heating hot water or steam is generally lower pressure fluid pipe and other uses. The representative of material Q235A grade steel. - GB/T3092-1993 (low pressure liquid delivery galvanized welded steel pipe). Mainly used for conveying water, gas, air, oil and heating hot water or steam is generally lower pressure fluid tube and other purposes. The representative of material: steel Q235A class.
GB/T14291-1992 (mine liquid welded steel pipe). Mainly used for mining air pressure, drainage, the axis put gas with a straight seam welded steel pipe. Its representative material Q235A, B grade steel. GB/T14980-1994 (low pressure fluid with a large diameter welded steel pipe). Low pressure fluid for conveying water, sewage, gas, air, steam heating and other uses. The representative of material Q235A grade steel.
GB/T12770-1991 (mechanical structure stainless steel welded pipe). Mainly used for decoration of machinery, automobiles, bicycles, furniture, hotels and restaurants and other mechanical components and structural parts. The representative of material 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb.
GB/T12771-1991 (fluid transport stainless steel welded pipe). Mainly used for conveying low pressure corrosive media. On behalf of - the table is made of 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2.

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