1. Welded steel pipe (GB/T3092- 1993) used for low-pressure fluid transportation is also called general welded pipe, commonly known as black pipe. It is a welded steel pipe, which is used for conveying water, gas, air, oil, heating steam and other general low-pressure fluids. The wall thickness of steel pipe is divided into ordinary steel pipe and thickened steel pipe; The nozzle end can be divided into two types: unthreaded pipe (smooth pipe) and threaded pipe. The specifications of steel pipes are expressed in nominal diameter (mm), which is an approximation of the inner diameter. Traditionally expressed in inches, such as 1 1/2, etc. The welded steel pipe for low-pressure fluid transportation is not only directly used for fluid transportation, but also used as the original pipe of galvanized welded steel pipe for low-pressure fluid transportation.

2. Galvanized welded steel pipe (GB/T309 1- 1993) for low-pressure fluid transportation is also called galvanized welded steel pipe, commonly known as white pipe. It is a hot-dip galvanized welded (furnace welding or electric welding) steel pipe, which is used for conveying water, gas, air, oil, heating steam, warm water and other general low-pressure fluids or other purposes. The wall thickness of steel pipe is divided into ordinary galvanized steel pipe and thickened galvanized steel pipe; The nozzle end is divided into unthreaded galvanized steel pipe and threaded galvanized steel pipe. The specifications of steel pipes are expressed in nominal diameter (mm), which is an approximation of the inner diameter. Traditionally expressed in inches, such as 1 1/2, etc.

3. Ordinary carbon steel wire sleeve (GB3640-88) is a steel pipe used to protect wires in industrial and civil buildings, mechanical equipment installation and other electrical installation projects.

4. The longitudinal welded steel pipe (YB242-63) is a steel pipe whose weld is parallel to the longitudinal direction of the steel pipe. Usually divided into metric welded steel pipes, welded thin-walled pipes, transformer cooling oil pipes, etc.

5. Spiral seam submerged arc welded steel pipe (SY5036-83) for pressure fluid transportation is a spiral seam steel pipe made of hot-rolled steel strip coil as tube blank, which is spirally formed at room temperature and welded by double-sided submerged arc welding. Steel pipe has strong bearing capacity and good welding performance, and it is safe and reliable to use after various rigorous scientific inspections and tests. The steel pipe has large diameter and high conveying efficiency, which can save the investment in laying pipelines. Mainly used for transporting oil and natural gas pipelines.

6. Spiral seam high-frequency welded steel pipe for pressure fluid transportation (SY5038-83) is a kind of spiral seam high-frequency welded steel pipe for pressure fluid transportation, which is formed by spiral forming at room temperature and high-frequency lap welding. Steel pipe has strong bearing capacity and good plasticity, which is convenient for welding. After various rigorous scientific inspections and tests, it is safe and reliable to use, with large steel pipe diameter and high conveying efficiency, which can save the investment in laying pipelines. Mainly used for laying pipelines for transporting oil, natural gas, etc.

7. Spiral seam submerged arc welded steel pipe (SY5037-83) for general low-pressure fluid transportation is a submerged arc welded steel pipe with hot-rolled steel coil as tube blank, which is spirally formed at room temperature by double-sided automatic submerged arc welding or single-sided welding, and is used for general low-pressure fluid transportation such as water, gas, air and steam.

8. The spiral seam high-frequency welded steel pipe (SY5039-83) for general low-pressure fluid transportation is made of hot-rolled steel strip coil, which is spirally formed at room temperature and welded by high-frequency lap welding.

9. Spiral welded steel pipe for pile (SY5040-83) is made of hot-rolled steel strip coil, which is spirally formed at room temperature and welded by double-sided submerged arc welding or high frequency welding. Steel pipes used as foundation piles for civil building structures, docks, bridges, etc.