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Talking about the classification and various uses of welded steel pipe

Welded pipe is also known as welded steel pipe, which is made of steel plate or strip steel after crimping and forming. The production process of welded steel pipe is simple, the production efficiency is high, the varieties and specifications are more, and the equipment cost is less, but the general strength of welded steel pipe is lower than that of seamless steel pipe. Since the 1930s, with the rapid development of high-quality strip continuous rolling production and the progress of welding and inspection technology, the quality of weld joint is constantly improved, and the variety and specification of welded steel pipe are increasing day by day, and the seamless steel pipe is replaced in more and more fields. Welded steel pipe can be divided into longitudinal welded pipe and spiral welded pipe according to the form of weld.

1、 Classification of welded pipe

Classification of welded pipe by use: according to the use, it can be divided into general welded pipe, galvanized welded pipe, oxygen blown welded pipe, wire sleeve, metric welded pipe, idler pipe, deep well pump pipe, automobile pipe, transformer pipe, welded thin-walled pipe, welded special-shaped pipe and spiral welded pipe.

2、 Application scope of welded pipe

Welded pipe products are widely used in boiler, automobile, ship, light structure of building steel, furniture, agricultural machinery, scaffolding, wire conduit, high-rise shelf, container, etc. Can meet customer requirements, special specifications of welded pipe can be processed according to user requirements.

Theoretical calculation method of welded pipe weight

He has a formula to follow for the theoretical calculation method of welded pipe weight;

Theoretical weight of steel pipe per meter (density of steel is 7.85kg/dm3)

Calculation formula: w = 0.02466 (D-S) s

Where: W -- theoretical weight of steel pipe per meter, kg / M;

D -- Nominal outer diameter of steel pipe, mm;

S -- nominal wall thickness of steel pipe, mm.

Official definition and industrial application of welded pipe

Steel plate or strip steel is used for welding steel pipe, which can be divided into furnace welded pipe, electric welding (resistance welding) pipe and automatic arc welding pipe due to different welding processes. Because of the different welding forms, it can be divided into longitudinal welded pipe and spiral welded pipe. Because of its end shape, it can be divided into round welded pipe and special-shaped (square, flat, etc.) welded pipe. Welded pipe is divided into the following varieties due to different materials and uses:

1. GB / t3091-1993 (galvanized welded steel pipe for low pressure fluid transportation)

It is mainly used for conveying water, gas, air, oil, heating hot water or steam and other low pressure fluids and other pipes. Its representative material is Q235 grade a steel.

2. GB / t3092-1993 (galvanized welded steel pipe for low pressure fluid transportation)

It is mainly used to transport water, gas, air, oil, heating hot water or steam and other low pressure fluids and other pipes. Its representative material is: Q235A steel.

3. GB / t14291-1992 (welded steel pipe for mining fluid transportation)

It is mainly used for longitudinal welded steel pipe for mine air pressure, drainage and shaft gas drainage. It represents Q235A and B grade steel. GB / t14980-1994 (large diameter welded steel pipe for low pressure fluid transportation). It is mainly used to transport water, sewage, gas, air, heating steam and other low-pressure fluids and other purposes. Its representative material is Q235 grade a steel.

4. GB / t12770-1991 (stainless steel welded steel pipe for mechanical structure)

It is mainly used for machinery, automobile, bicycle, furniture, hotel and restaurant decoration and other mechanical parts and structural parts. Its representative materials are 0Cr13, 1Cr17, 00cr19ni11, 1Cr18Ni9, 0cr18ni11nb, etc.

5. GB / t12771-1991 (stainless steel welded steel pipe for fluid transportation)

It is mainly used for conveying low pressure corrosive medium. The representative materials are 0Cr13, 0Cr19Ni9, 00cr19ni11, 00Cr17, 0cr18ni11nb, 0017cr17ni14mo2, etc.

The above content is introduced here. For more information, please continue to pay attention to this website.


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