Steel Pipe
A steel with a hollow section and a length much greater than the diameter or circumference. According to the cross-sectional shape, it is divided into round, square, rectangular and special-shaped steel pipe; 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 purpose, it is divided into transportation pipelines, engineering structures, Steel pipes for thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc.; according to the production process, it is divided into seamless steel pipes and welded steel pipes, among which seamless steel pipes are divided into hot-rolled and cold-rolled (drawn) Two types, welded steel pipes are divided into longitudinal welded steel pipes and spiral welded steel pipes.
Steel pipe is not only used to transport fluids and powdered solids, exchange heat, and manufacture mechanical parts and containers, but 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 use of steel pipes to manufacture highway bridges can not only save steel, simplify construction, but also greatly reduce the area of the protective layer, saving investment and maintenance costs.
By production method:
Steel pipes can be divided into two categories according to production methods: seamless steel pipes and welded steel pipes. Welded steel pipes are referred to as welded pipes for short.
According to the production method, seamless steel pipes can be divided into: hot-rolled seamless pipes, cold drawn pipes, precision steel pipes, hot expanded pipes, cold spinning pipes and extruded pipes.
Seamless steel pipes are made of high-quality carbon steel or alloy steel, and are divided into hot rolled and cold rolled (drawn).
Welded steel pipes are divided into furnace welded pipes, electric resistance welded (resistance welded) pipes and automatic arc welded pipes due to their different welding processes. Due to their different welding forms, they are divided into two types: straight seam welded pipes and spiral welded pipes. They are divided into two types because of their end shapes. Round welded pipe and special-shaped (square, flat, etc.) welded pipe.
Welded steel pipes are formed by welding steel plates rolled into a tube shape with butt or spiral seams. In terms of manufacturing methods, they are divided into welded steel pipes for low-pressure fluid transportation, spiral seam electric welded steel pipes, direct coil welded steel pipes, and electric welded pipes. Seamless steel pipes can be used for liquid pressure pipes and gas pipes in various industries. Welded pipelines can be used for water pipelines, gas pipelines, heating pipelines, electrical pipelines, etc.
By material:
Steel pipes can be divided into carbon pipes, alloy pipes, stainless steel pipes, etc. according to the pipe material (that is, steel type).
Carbon tubes can be divided into ordinary carbon steel tubes and high-quality carbon structural tubes.
Alloy pipe can be divided into: low alloy pipe, alloy structure pipe, high alloy pipe and high strength pipe. Bearing tubes, heat-resistant and acid-resistant stainless tubes, precision alloy (such as Kovar) tubes and high-temperature alloy tubes, etc.
According to coating characteristics:
According to the characteristics of surface coating, steel pipes can be divided into: clarinet (uncoated) and coated pipe.
Coated pipes include galvanized pipes, aluminum-plated pipes, chrome-plated pipes, aluminized pipes and other alloy-layer steel pipes.
Coated tubes include outer coating tubes, inner coating tubes, and inner and outer coating tubes. The commonly used coatings are plastic, epoxy resin, coal tar epoxy resin and various glass-type anticorrosive coating materials.
Galvanized pipe is divided into: KBG pipe, JDG pipe, threaded pipe and so on.
By purpose:
1.Usage. Such as: seamless pipes for water, gas pipes, steam pipes, oil pipelines, and oil and gas trunk lines. Agricultural irrigation water taps with pipes and sprinkler irrigation pipes.
2.Pipes for thermal equipment. Such as boiling water pipes and superheated steam pipes for general boilers, superheating pipes, large smoke pipes, small smoke pipes, arched brick pipes and high temperature and high pressure boiler pipes for locomotive boilers.
3.Pipes for machinery industry. Such as aerospace structural tubes (round tube, oval tube, flat oval tube), automobile half-shaft tube, axle tube, automobile tractor structure tube, tractor oil cooler tube, agricultural machinery square tube and rectangular tube, transformer tube and bearing Tube and so on.
4.Pipes for petroleum geological drilling. Such as: oil drilling pipes, oil drill pipes (kelly and hexagonal drill pipes), drill stems, oil tubing, oil casing and various pipe joints, geological drilling pipes (core pipe, casing, active drill pipe, drill stem , Press hoop and pin joints, etc.).
5.Tubes for the chemical industry. Such as: petroleum cracking pipes, chemical equipment heat exchangers and pipes, stainless acid-resistant pipes, high-pressure pipes for fertilizers and pipes for transporting chemical media
6.Other departments use management. Such as: container tubes (tubes for high-pressure gas cylinders and general container tubes), tubes for instruments and instruments, tubes for watch cases, injection needles and tubes for medical devices, etc.