GB Standard for Welded Steel Pipes

1. Welded steel pipes for low-pressure fluid transportation (GB/T3092-1993) are also called general welded pipes, commonly known as black pipes.
 

It is a welded steel pipe for conveying general lower pressure fluids such as water, gas, air, oil and heating steam and other purposes. Steel pipes are divided into ordinary steel pipes and thickened steel pipes according to wall thickness; according to the form of pipe ends, they are divided into unthreaded steel pipes (smooth pipes) and threaded steel pipes. The specification of the steel pipe is indicated by the nominal diameter (mm), which is an approximation of the inner diameter. It is customary to express in inches, such as 11/2. In addition to being directly used to transport fluids, welded steel pipes for low-pressure fluid transportation are also widely used as the original pipes of galvanized welded steel pipes for low-pressure fluid transportation.

2. Galvanized welded steel pipe for low-pressure fluid transportation (GB/T3091-1993) is also called galvanized electric welded steel pipe, commonly known as white pipe.

Hot-dip galvanized welded (furnace welded or electric welded) steel pipes for conveying water, gas, air oil, heating steam, warm water and other general lower pressure fluids or other purposes. Steel pipes are divided into ordinary galvanized steel pipes and thickened galvanized steel pipes according to wall thickness; according to the form of pipe ends, they are divided into non-threaded galvanized steel pipes and threaded galvanized steel pipes. The specification of the steel pipe is expressed by the nominal diameter (mm), which is an approximate value of the inner diameter.

3. Ordinary carbon steel wire casing (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.

4. Straight seam electric welded steel pipe (YB242-63) is a steel pipe with the weld seam parallel to the longitudinal direction of the steel pipe. Usually divided into metric electric welded steel pipe, electric welded thin-walled pipe, transformer cooling oil pipe and so on.

5. Spiral seam submerged arc welded steel pipe for pressurized fluid transportation (SY5036-83) is made of hot-rolled steel strip coils as tube blanks, often spirally formed at warm temperatures, and welded by double-sided submerged arc welding. It is used for pressurized fluid transportation. Spiral seam steel pipe. The steel pipe has strong pressure bearing capacity and good welding performance. After various strict scientific inspections and tests, it is safe and reliable to use. The diameter of the steel pipe is large, the transportation efficiency is high, and the investment in laying pipelines can be saved. Mainly used for pipelines for transporting oil and natural gas.

6. Spiral seam high-frequency welded steel pipe for pressurized fluid transportation (SY5038-83) is made of hot-rolled steel coil as a tube blank, often spirally formed at temperature, and welded by high-frequency lap welding. It is used for pressurized 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. Mainly used for laying pipelines for transporting oil, natural gas, etc.

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

8. Spiral seam high-frequency welded steel pipe (SY5039-83) for general low-pressure fluid conveying is made of hot-rolled steel coil as the tube blank, often spirally formed at high temperature, and welded by high-frequency lap welding for general low-pressure fluid conveying. Seam high frequency welded steel pipe.
 

9. Spiral welded steel pipes for piles (SY5040-83) are made of hot-rolled steel coils as tube blanks, often formed by warm spirals, and made of double-sided submerged arc welding or high-frequency welding. They are used for civil construction structures, wharfs , Bridges and other foundation piles with steel pipes.

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