The Classification of Welded Steel Pipe or Application Range

The time of issue:2013-11-4 8:42:27       Author:

Classification by welding methods:
1. The welded steel pipe: used in oil drilling and machinery manufacturing.

2. Stove pipe: used as water and gas pipe, large diameter welded pipe for high pressure oil and gas transmission, etc.; spiral welded pipe for oil and gas transportation, piles, piers, etc.

Classification by the seam shape:
1. Longitudinal: production process is simple, high efficiency, low cost, rapid development.

2. Spiral welded pipe: Longitudinal generally higher than, can narrow the billet production of large diameter pipe, you can also use the same width of the billet production of different pipe diameters, but with the same length of straight pipe joints than weld length of 30 to 100%, and lower production rate. Therefore, the smaller diameter pipe is mostly a straight seam welded; large diameter spiral welded pipe is mostly.
Spiral welded steel pipe classified into automatic submerged arc welded steel pipe and high-frequency:
a. spiral seam automatic submerged arc welding steel pipe according to the transmission medium and low pressure pipe is divided into Group A and Group B tube categories. CPI general use ordinary carbon steel pipe Q235, Q235F and ordinary low-alloy structural steel 16Mn welded, B pipe with Q235, Q235F, Q195 and other steel welding system for low-pressure fluid transfer pipe

b. spiral seam high frequency welded steel pipe spiral welded steel pipe, still no uniform product standards, generally use ordinary carbon steel Q235, Q235F such as steel manufacturing.

Classification by the pipe material and the use:
1. GB/T3091-1993 (low pressure fluid galvanized welded steel pipe). Mainly used for conveying water, gas, air, oil and heating hot water or low pressure steam and other fluids and other general purpose pipes, the representative of material Q235A grade steel.

2. GB/T3092-1993 (low pressure fluid galvanized welded steel pipe). Mainly used for conveying water, gas, air, oil and heating hot water or low pressure steam and other fluids and other general purpose pipes, the representative material for: Q235A grade steel.

3. GB/T14291-1992 (mine liquid welded steel pipe). Mainly used for mining pressure air supply, drainage, gas discharge shaft with a straight seam welded steel pipe. The representative of material Q235A, B grade steel, GB/T14980-1994 (low pressure fluid with a large diameter welded steel pipe), mainly used for conveying water, sewage, gas, air, low pressure steam heating fluids and other purposes, the representative of material Q235A grade steel.

4. GB/T12770-1991 (mechanical structure with stainless steel welded pipe), mainly used for machinery, automobiles, bicycles, furniture, hotel and restaurant decoration and other mechanical parts and structural components, the representative of material 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb so on.

5. GB/T12771-1991 (fluid transport stainless steel welded pipe). Mainly used for conveying low pressure corrosive media. Representative materials for 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2 so on.

The black steel pipe and API steel pipe are also available.

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