When welded steel pipe is manufactured, a steel plate or strip is bent and subsequently welded into either a circular, traditional pipe shape or a square shape, resulting in a seam on its body. Today, we will introduce in detail GB standards 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 used to transport generally lower pressure fluids such as water, gas, air, oil and heating steam. Steel pipes are divided into ordinary steel pipes and thickened steel pipes according to wall thickness; according to the shape of the pipe end, they are divided into unthreaded steel pipes (smooth pipes) and threaded steel pipes. The specifications of steel pipes are expressed in nominal diameter (mm), which is an approximate value of the inner diameter. It is customarily expressed 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 for 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 transporting water, gas, air oil, heating steam, warm water and other generally lower pressure fluids or other purposes. Steel pipes are divided into ordinary galvanized steel pipes and thickened galvanized steel pipes according to wall thickness; they are divided into unthreaded galvanized steel pipes and threaded galvanized steel pipes according to the pipe end form. The specifications of steel pipes are expressed in 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 and mechanical equipment installation.
4. Straight seam electric welded steel pipe (YB242-63) is a steel pipe with the welding seam and the steel pipe longitudinally parallel. Usually divided into metric electric welded steel pipes, electric welded thin-walled pipes, transformer cooling oil pipes, etc.
5. Spiral seam submerged arc welded steel pipe The pipeline (SY5036-83) used for pressurized fluid transportation uses hot-rolled steel strip coils as pipe blanks, which are often spirally formed at high temperatures and welded by double-sided submerged arc welding. It is used for pressurized fluid transfer. Spiral seam steel pipe. The steel pipe has strong pressure bearing capacity and good welding performance. After various rigorous scientific inspections and tests, it is safe and reliable to use. Steel pipes have large diameters and high transportation efficiency, which can save investment in laying pipelines. Mainly used for pipelines transporting oil and natural gas.
6. Spiral seam high-frequency welded steel pipe (SY5038-83) for pressure fluid transportation is made of hot-rolled steel coils as tube blanks, spirally formed at room temperature, and welded by high-frequency lap welding. It is used for pressurized fluid transfer. Spiral seam high frequency welded steel pipe. Steel pipes have strong pressure-bearing capacity, good plasticity, and are easy to weld and process. 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. Spiral seam submerged arc welded steel pipes (SY5037-83) for low-pressure fluid transportation generally use hot-rolled steel coils as tube blanks, which are often spirally formed and adopt double-sided automatic forming submerged arc welding or single-sided welding. Submerged arc welded steel pipes are used for transporting general low-pressure fluids such as water, gas, air, steam, etc.
8. Spiral seam high-frequency welded steel pipe (SY5039-83) for general low-pressure fluid transportation uses hot-rolled steel coils as tube blanks, which are often spirally formed at high temperatures and welded by high-frequency lap welding. They are suitable for general low-pressure fluid transportation. Seamed high frequency welded steel pipe.
9. Spiral welded steel pipes for piles (SY5040-83) are made of hot-rolled steel coils as tube blanks, which are often formed using warm spirals and double-sided submerged arc welding or high-frequency welding. Used for steel pipe foundation piles in civil construction structures, docks, bridges, etc.
