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National standard large-caliber spiral steel tube craze

National standard large-caliber spiral steel tube craze

(Summary description)Large-diameter spiral steel pipe refers to spiral steel pipe with a caliber above DN850. The main raw material for production is strip steel. The strength of spiral steel pipes is generally higher than that of straight-seam welded pipes. It is possible to produce welded pipes with larger diameters from narrow blanks, and to produce welded pipes with different diameters from blanks of the same width. The large-scale spiral steel pipe adopts double-sided submerged arc welding technology. Submerged arc welding has the advantages of stable welding quality, high welding productivity, no arc light and little smoke and so on. The main parameters are outer diameter, wall thickness and length. The main mechanics tests are water pressure, bending, and flattening.

National standard large-caliber spiral steel tube craze

(Summary description)Large-diameter spiral steel pipe refers to spiral steel pipe with a caliber above DN850. The main raw material for production is strip steel. The strength of spiral steel pipes is generally higher than that of straight-seam welded pipes. It is possible to produce welded pipes with larger diameters from narrow blanks, and to produce welded pipes with different diameters from blanks of the same width. The large-scale spiral steel pipe adopts double-sided submerged arc welding technology. Submerged arc welding has the advantages of stable welding quality, high welding productivity, no arc light and little smoke and so on. The main parameters are outer diameter, wall thickness and length. The main mechanics tests are water pressure, bending, and flattening.

Information

Large-diameter spiral steel pipe refers to spiral steel pipe with a caliber above DN850. The main raw material for production is strip steel. The strength of spiral steel pipes is generally higher than that of straight-seam welded pipes. It is possible to produce welded pipes with larger diameters from narrow blanks, and to produce welded pipes with different diameters from blanks of the same width. The large-scale spiral steel pipe adopts double-sided submerged arc welding technology. Submerged arc welding has the advantages of stable welding quality, high welding productivity, no arc light and little smoke and so on. The main parameters are outer diameter, wall thickness and length. The main mechanics tests are water pressure, bending, and flattening.

   The implementation standards are as follows

SY / T5037-2008 (Ministry standard, also called spiral seam submerged arc welded steel pipe for general fluid transportation pipeline)

GB / T9711.1-2008 (national standard, also called oil and gas industry transportation steel pipe)

API-5L (American Petroleum Institute, also called pipeline steel pipe)

SY / T5040-2008 (spiral welded steel pipe for piles).

SY5039-2000 (spiral seam high frequency welded steel pipe for general low pressure fluid transportation)

 

main material

Q235a, Q235B, 20 #, Q345 (16Mn), x42-x70 pipeline steel

 

The main purpose

For liquid transportation: water supply and drainage.

For gas transportation: coal gas, steam, liquefied petroleum gas.

For structural use: for piling pipes and bridges; for pier, road, building structure, etc.

 

The following briefly introduces the application of several welded pipes:

1. The general welded pipe is used for the transportation of generally lower pressure fluids such as water, gas, air, oil and heating steam.

2. Ordinary carbon steel wire bushing (GB3640-88) is a steel pipe used to protect wires in electrical installation projects such as industrial and civil buildings, installation of machinery and equipment.

3. Straight seam welded pipe (YB242-63) is a steel pipe with a weld line parallel to the longitudinal direction of the steel pipe. It is usually divided into metric welded pipes, welded thin-walled pipes, transformer cooling oil pipes, etc.

4. Spiral seam submerged arc welded pipe for pressure fluid transportation (SY5036-83) is a hot rolled steel strip coil as a tube blank, which is often hot spiral formed and welded by double-sided submerged arc welding method. Seam steel pipe. The steel pipe has strong pressure-bearing ability and good welding performance. After various strict scientific inspections and tests, it is safe and reliable to use. The steel pipe has a large diameter, high transmission efficiency, and can save the capital for laying pipelines. Mainly used to transport oil and natural gas pipelines.

5. Spiral seam high-frequency welded pipe for pressure fluid transportation (SY5038-83) is made of hot-rolled steel coil as the tube blank, which is often hot spiral formed and welded by high-frequency lap welding, which is used for pressure fluid transportation. Spiral seam high frequency welded steel pipe. The steel pipe has strong pressure bearing capacity and good plasticity, which is convenient for welding and processing; after various strict and scientific inspections and tests, it is safe and reliable to use, with a large diameter of steel pipe, high transmission efficiency, and can save the capital for laying pipelines. It is mainly used for laying pipelines for transporting oil and natural gas.

6. The spiral seam submerged arc welded steel pipe (SY5037-83) for general low-pressure fluid transportation is made of hot-rolled steel strip coil as the tube blank, which is often hot spiral formed. It is made of double-sided automatic submerged arc welding or single-sided welding method. Submerged arc welded steel pipes for general low pressure fluid transportation such as water, gas, air and steam.

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13768885388  /  13878122022

18260931196  /  15677140888

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