Representation method
The specifications of circular tubes are expressed by outer diameter (such as outer diameter or side length), inner diameter and wall thickness, and their sizes range from capillary tubes with very small diameter to large circular steel tubes with a diameter of several meters.
Main applications
The circular tube can be used in pipelines, thermal equipment, machinery industry, petroleum geological drilling, containers, chemical industry and special purposes.
classify
According to the mode of production, it can be divided into seamless circular tube and welded circular tube.
Seamless steel pipe manufacturing process
Tube blank; Inspection; Peeling; Inspection; Heating; Perforation; Pickling; Grinding; Lubrication and air drying; Welding head; Cold drawing; Solid solution treatment; Pickling; Acid pickling passivation; test
Manufacturing technology of welded steel pipe
Strip steel; Inspection; Shear; Fixed length; Qualitative; Welding; Smooth (seamless); Fixed length; test
Volume of circular tube: V=π(R? -r？ ) h Note: π; Pi ≈3. 14，r； Outer radius r; Inner diameter, h; Pipe length.
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