Welded pipe (also known as welded steel pipe), basically made of welded steel pipe after steel plate or strip steel is crimped. Welded steel pipe production process is simple, high production efficiency, variety specifications, equipment and less, but the general strength is lower than the seamless steel pipe. Since the 1930s, with the rapid development of the production of high-quality strip continuous rolling and the advancement of welding and inspection technologies, the quality of welds has been continuously increasing, and the variety and specifications of welded steel pipes have been increasing, and they have been replaced in more and more fields. Steel pipe. Welded steel pipes are divided into straight seam welded pipes and spiral welded pipes in the form of welds.
The blanks used for welded steel tubes are steel plates or strips, which are classified into furnaces, electric (resistance) tubes and automatic arc tubes because of their different welding processes. Because of its different welding methods, it is divided into two types: straight seam welded pipe and spiral welded pipe. Because of the shape of its ends, it is divided into circular welded pipes and special-shaped (square, flat, etc.) welded pipes. Welded pipes are divided into the following categories due to their different materials and uses:
1, GB/T3091-1993 (low pressure fluid transport galvanized welded steel pipe). Mainly used to transport water, gas, air, oil and heating water or steam and other general low pressure fluid and other uses. It stands for Q235A grade steel.
2, GB/T3092-1993 (low pressure fluid transport galvanized welded steel pipe). Mainly used to transport water, gas, air, oil and heating water or steam and other general low pressure fluids and other uses. Its representative material is: Q235A grade steel.
3, GB/T14291-1992 (mine fluid transport welded steel pipe). It is mainly used in mine pressure air, drainage, axial gas pipelines and straight seam welded steel pipes. Its representative material Q235A, B grade steel. GB/T14980-1994 (large diameter welded steel pipe for low pressure fluid delivery). Mainly used for conveying water, sewage, gas, air, heating steam and other low-pressure fluids and other uses. It stands for Q235A grade steel.
4, GB/T12770-1991 (stainless steel welded steel pipe for mechanical structures). Mainly used for machinery, automobiles, bicycles, furniture, hotel and restaurant decoration and other mechanical parts and structural parts. Its representative material 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb and so on.
5, GB/T12771-1991 (fluid transport stainless steel welded steel pipe). It is mainly used for conveying low-pressure corrosive media. Representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2 and so on.
The straight seam welded pipe has a simple production process, high production efficiency, low cost, and rapid development. The strength of the spiral welded pipe is generally higher than that of the straight seam welded pipe. A narrower blank can be used to produce a larger diameter pipe, and a blank having a different diameter can also be produced using a blank of the same width. However, compared with the straight seam pipe of the same length, the length of the weld seam increases by 30 to 100%, and the production speed is low.
Therefore, the smaller diameter welded pipe mostly adopts the straight seam welding, and the large diameter welded pipe adopts the spiral welding.
The blanks used for welded steel tubes are steel plates or strips, which are classified into furnaces, electric (resistance) tubes and automatic arc tubes because of their different welding processes. Because of its different welding methods, it is divided into two types: straight seam welded pipe and spiral welded pipe. Because of the shape of its ends, it is divided into circular welded pipes and special-shaped (square, flat, etc.) welded pipes. Welded pipes are divided into the following categories due to their different materials and uses:
1, GB/T3091-1993 (low pressure fluid transport galvanized welded steel pipe). Mainly used to transport water, gas, air, oil and heating water or steam and other general low pressure fluid and other uses. It stands for Q235A grade steel.
2, GB/T3092-1993 (low pressure fluid transport galvanized welded steel pipe). Mainly used to transport water, gas, air, oil and heating water or steam and other general low pressure fluids and other uses. Its representative material is: Q235A grade steel.
3, GB/T14291-1992 (mine fluid transport welded steel pipe). It is mainly used in mine pressure air, drainage, axial gas pipelines and straight seam welded steel pipes. Its representative material Q235A, B grade steel. GB/T14980-1994 (large diameter welded steel pipe for low pressure fluid delivery). Mainly used for conveying water, sewage, gas, air, heating steam and other low-pressure fluids and other uses. It stands for Q235A grade steel.
4, GB/T12770-1991 (stainless steel welded steel pipe for mechanical structures). Mainly used for machinery, automobiles, bicycles, furniture, hotel and restaurant decoration and other mechanical parts and structural parts. Its representative material 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb and so on.
5, GB/T12771-1991 (fluid transport stainless steel welded steel pipe). It is mainly used for conveying low-pressure corrosive media. Representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2 and so on.
The straight seam welded pipe has a simple production process, high production efficiency, low cost, and rapid development. The strength of the spiral welded pipe is generally higher than that of the straight seam welded pipe. A narrower blank can be used to produce a larger diameter pipe, and a blank having a different diameter can also be produced using a blank of the same width. However, compared with the straight seam pipe of the same length, the length of the weld seam increases by 30 to 100%, and the production speed is low.
Therefore, the smaller diameter welded pipe mostly adopts the straight seam welding, and the large diameter welded pipe adopts the spiral welding.
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