Steel pipes are the "blood vessels" of industry

Steel pipesare not only used to transport fluids and powdery solids, exchange heat energy, and make mechanical parts and containers, it is also an economical steel. The use of steel pipes to manufacture building structure grids, pillars and mechanical supports can reduce weight, save metal by 20~40%, and can realize Factory mechanized construction. The manufacture of highway bridges with steel pipes can not only save steel and simplify construction, but also greatly reduce the area of the protective layer and save investment and maintenance costs.

Steel with a hollow section that is much longer than its diameter or circumference. According to the cross-sectional shape, it is divided into round, square, rectangular and special-shaped steel pipes; According to the material, it is divided into carbon structural steel pipe, low-alloy structural steel pipe, alloy steel pipe and composite steel pipe; According to the use, it is divided into steel pipes for transportation pipelines, engineering structures, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, and high-pressure equipment. According to the production process, it is divided into seamleSs Steel pipe and welded steel pipe, of which seamless steel pipe is divided into hot rolled and cold rolled (drawn), and welded steel pipe is divided into longitudinal welded steel pipe and spiral seam welded steel pipe.

Steel pipes can be divided into two categories according to the production method: seamless steel pipes and welded steel pipes, and welded steel pipes are referred to as welded pipes.
According to the production method, seamless steel pipe can be divided into: hot-rolled seamless pipe, cold-drawn pipe, precision steel pipe, hot-expanded pipe, cold-spinning pipe and extruded pipe.
Seamless steel pipes are made of high-quality carbon steel or alloy steel, and are hot-rolled and cold-rolled (drawn).
Welded steel pipes are divided into furnace welded pipes, electric welded (resistance welded) pipes and automatic arc welded pipes due to their different welding processes, and are divided into two kinds of longitudinal welded pipes and spiral welded pipes because of their different welding forms, and are divided into round welded pipes and special-shaped (square, flat, etc.) welded pipes because of their end shapes.
Welded steel pipe is made of coiled tubular steel plate welded by butt seam or spiral seam, and in terms of manufacturing method, it is divided into welded steel pipe for low-pressure fluid transportation, welded steel pipe with spiral seam, direct coil welded steel pipe, welded pipe, etc. Seamless steel pipes can be used in various industries such as liquid pneumatic pipes and gas pipelines. Welded pipes can be used for water pipelines, gas pipelines, heating pipelines, electrical pipes, etc.

Steel pipes are divided into seamless steel pipes and welded steel pipes. The seamless steel pipe production process is to thread a solid tube blank or steel ingot into a hollow capillary, which is then rolled into a steel pipe of the required size. The different methods of perforation and rolling are used to produce seamless steel pipes. The production process of welded steel pipe is to bend the pipe blank (steel plate or strip) into a tube, and then weld the gap to form a steel pipe. Due to the different forming and welding methods adopted, different methods for producing welded steel pipes are constituted.

Steel pipe use:
1. Pipes for pipelines. Such as: seamless pipes for water, gas pipes, steam pipelines, oil transmission pipes, and pipes for oil and gas trunk lines. Agricultural irrigation faucets with pipes and sprinkler irrigation pipes, etc.
2. Pipes for thermal equipment. Such as boiling water pipes, superheated steam pipes for general boilers, superheated pipes, large smoke pipes, small smoke pipes, arch brick pipes and high-temperature and high-pressure boiler tubes for locomotive boilers.
3. Pipes for machinery industry. Such as aviation structure pipe (round pipe, elliptical pipe, flat elliptical pipe), automobile half shaft tube, axle tube, automobile tractor structural tube, tractor oil cooler pipe, agricultural machinery square pipe and rectangular tube, transformer pipe and bearing tube, etc.
4. Pipes for petroleum geology drilling. Such as: oil drilling pipe, oil drill pipe (square drill pipe and hexagonal drill pipe), drilling straight, oil tubing, oil casing and various pipe joints, geological drilling pipe (core pipe, casing, active drill pipe, drilling straight, hoop and pin joint, etc.).
5. Pipes for the chemical industry. Such as: petroleum cracking pipes, chemical equipment heat exchangers and pipelines, stainless acid resistant pipes, high-pressure pipes for fertilizers and pipes for transporting chemical media, etc.
6. Other departments use pipes. Such as: container tubes (high-pressure gas cylinder tubes and general container tubes), tubes for instrumentation, watch shells, injection needles and medical devices, etc.