1. Low-voltage fluid conveyor straight seam welded steel pipe (GB/T 3092-1993) is also known as ordinary straight seam steel pipes, commonly known as black pipes. Welded steel pipes are used to transport water, gas, air, oil, and steam heating general low -pressure fluids. Steel pipes are divided into a steel pipe and thick steel pipe, and the tube end is divided into non -threaded and steel pipes (smooth pipes) and threaded steel pipes. When the specification steel pipe is known to a public diameter (MM), the nominal diameter is approximately diameter. Usually use inches, such as 11x2. Welding steel pipes are used for low -voltage fluid transportation, which are not only used to directly transport fluids, but also the original pipes of galvanized welding steel pipes that can be used for low -voltage fluid transportation.
2. Galvanized straight seam welded steel pipe (GB / T 3091-1993) is used for low-voltage fluids, also known as galvanized welding straight seam welding steel pipes, commonly known as white pipes. It is used to transport water, gas, air, oil, oil, and heating. Steam, warm water, etc. Generally uses low -pressure work fluids or other steel pipes with hot -dip galvanized welding (furnace welding or electric welding). The wall thickness of the steel pipe is divided into ordinary galvanized steel and thick galvanized steel plates. The non -threaded pipe end is inserted into threaded galvanized steel and galvanized steel. When the specification steel pipe is known to a public diameter (MM), the nominal diameter is approximately diameter. Usually use inches, such as 11x2.
3. Ordinary carbon steel sleeve (GB3640-88) is a direct pipe connector that is used in the installation projects of electrical machinery and equipment such as industrial and civil buildings, installation, etc. to protect the wires.
4. Direct seam welding for steel pipes (YB 242-63) is a straight welding steel pipe that parallel with steel pipes with longitudinal research. It can usually be divided into welding straight seam steel pipes, welding thin-walled straight seam pipes, transformer cooling oil straight seam pipes, etc. Essence
5. Pressure fluid conveyor spiral arc welding straight seam steel pipe (SY5036-83) is a hot-rolled steel pipe as a spiral shell. It is often formed at a certain temperature and uses double-sided arc welding methods and pressure fluid to flood. Steel pipes have relatively strong pressure and good welding technical properties.
6. Pressure fluid conveyor spiral high-frequency welding steel pipe (SY5038-83) is a high-frequency welding steel tube spiral. During the overlapping high-frequency welding process, it is often used as a hot-rolled tube. Steel pipes have strong pressure, good plasticity, and welding technology processing can be convenient. After various strict scientific inspection and experiments, the use of safety and reliability, large steel pipe diameter, and high transportation efficiency can save investment in pipelines. It is mainly used for laying oil and natural gas transportation pipelines.
7. Used to perform low-pressure work fluids (SY5037-83) through the spiral joints transported by transportation. Buried arc welding steel pipe. It is a buried arc welding steel pipe that can be used for water, gas, and air.
8. Usually the spiral seam high-frequency welding steel pipe (SY5039-83) tube transported by low-voltage streaming is formed a hot-rolled steel plate at room temperature. The high-frequency welding method spiral connection frequency welding steel pipe is generally transmitted.
9. The pile with a spiral welding pipe (SY5040-83) is based on the tube billet through the hot-rolled steel tube. Structure, dock, bridge and other basic piles.
The production process of straight welding pipes is simple, high production efficiency, low cost, and rapid development. Spiral pipes are usually greater than longitudinal strength. The welded pipe with a large diameter can be produced with a narrower square blank, and the welded pipes with different pipe diameters can be produced at the same billet width. However, as long as it is compared with the straight tube joints, the length of the weld is increased by 30 % and 100 %, reducing productivity.
Therefore, most of the small diameter welded pipes use straight seam welding, and most of the large -caliber welded pipes can be welded.
