There are 4 types of welded steel pipes for low-pressure fluids
1. Welded steel pipes for low-pressure fluid transportation (GB/T3092-1993) are also called general welded pipes, commonly known as black pipes. They are welded steel pipes used to transport generally low-pressure fluids such as water, gas, air, oil and heating steam and other purposes. The wall thickness of the steel pipe joint is divided into ordinary steel pipes and thickened steel pipes; the pipe end form is divided into non-threaded steel pipes (plain 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 usually 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 of galvanized welded steel pipes for low-pressure fluid transportation.
2. Galvanized welded steel pipes for low-pressure fluid transportation (GB/T3091-1993) are also called galvanized electric welded steel pipes, commonly known as white pipes. It is a hot-dip galvanized welded (furnace welding or electric welding) steel pipe used for conveying water, gas, air, oil, heating steam, warm water and other general low-pressure fluids or other purposes. The wall thickness of the steel pipe joint is divided into ordinary galvanized steel pipe and thickened galvanized steel pipe; the pipe end form is divided into non-threaded galvanized steel pipe and threaded galvanized steel pipe. The specifications of the steel pipe are expressed in nominal diameter (mm), and the nominal diameter is the approximate value of the inner diameter. It is usually expressed in inches, such as 11/2, etc.
3. Spiral seam submerged arc welded steel pipe for general low-pressure fluid transportation (SY5037-83) is made of hot-rolled steel strip coil as pipe blank, spirally formed at room temperature, and made of double-sided automatic submerged arc welding or single-sided welding method. It is used for water, gas, air and steam and other general low-pressure fluid transportation. Submerged arc welded steel pipe.
4. Spiral seam high-frequency welded steel pipe for general low-pressure fluid transportation (SY5039-83) is made of hot-rolled steel strip coil as the tube blank, spirally formed at room temperature, and welded by high-frequency lap welding. It is used for spiral seam high-frequency welded steel pipe for general low-pressure fluid transportation.
