Steel pipe is a kind of steel with hollow section, whose length is far greater than the diameter or circumference. It is divided into circular, square, rectangular and special-shaped steel pipes according to the section shape; It can be divided into carbon structural steel pipe, low alloy structural steel pipe, alloy steel pipe and composite steel pipe according to the material; It can be divided into steel pipes for transmission pipeline, engineering structure, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc; According to the production process, it can be divided into seamless steel pipe and welded steel pipe. Seamless steel pipe can be divided into hot rolling and cold rolling (drawing). Welded steel pipe can be divided into straight seam welded steel pipe and spiral seam welded steel pipe.
Steel pipe is not only used to transport fluid and powdery solid, exchange heat energy, manufacture mechanical parts and containers, but also an economic steel. Using steel pipes to manufacture building structure grids, pillars and mechanical supports can reduce weight, save 20~40% of metal, and realize factory mechanized construction. Using steel pipes to make highway bridges can not only save steel materials and simplify construction, but also greatly reduce the area of protective coating, save investment and maintenance costs.
By production method
According to the production method, steel pipes can be divided into two categories: seamless steel pipes and welded steel pipes.Welded steel pipes are referred to as welded pipes for short.
1. Seamless steel tubes can be divided into hot rolled seamless tubes, cold drawn tubes, precision steel tubes, hot expanded tubes, cold spun tubes and extruded tubes according to production methods.
Seamless steel pipes are made of high-quality carbon steel or alloy steel, which can be hot rolled or cold rolled (drawn).
2. Welded steel pipes are divided into furnace welded pipes, electric welding (resistance welding) pipes and automatic arc welded pipes due to their different welding processes. They are divided into straight seam welded pipes and spiral welded pipes due to their different welding forms. Their end shapes are also divided into circular welded pipes and special-shaped (square, flat, etc.) welded pipes.
Welded steel pipes are welded from rolled steel plates with butt or spiral seams. In terms of manufacturing methods, they are also divided into welded steel pipes for low pressure fluid transportation, spiral electric welded steel pipes, directly rolled welded steel pipes, electric welded pipes, etc. Seamless steel pipes can be used in various industries, such as liquid and gas pipelines. Welding pipe can be used for water pipe, gas pipe, heating pipe, electrical pipe, etc.
The steel pipe can be divided into carbon pipe, alloy pipe, stainless steel pipe, etc. according to the pipe material (i.e. steel type).
Carbon pipes can also be divided into ordinary carbon steel pipes and high-quality carbon structural pipes.
Alloy pipe can be divided into low alloy pipe, alloy structure pipe, high alloy pipe and high strength pipe. Bearing tube,heat and acid resistant stainless steel tube, precision seamless steel tube and high temperature alloy tube.
Post time: Oct-25-2022