Categorized by manufacturing process
The manufacturing processes for seamless steel tubes can be divided into the following basic categories: hot rolling (extrusion), cold rolling (drawing), and hot expanded steel tubes.
(2) Welded pipes can be categorized by manufacturing process into: straight seam welded steel pipes, spiral seam welded steel pipes, plate-rolled butt-welded steel pipes, and hot-expanded welded steel pipes.
Categorized by shape
Steel pipes can be categorized by shape into round pipes, square pipes, rectangular pipes, octagonal pipes, hexagonal pipes, D-shaped pipes, pentagonal pipes, and other special-shaped steel pipes, such as complex cross-section pipes, double concave pipes, five-petal plum blossom-shaped pipes, conical pipes, corrugated pipes, melon-shaped pipes, and double convex pipes, etc.
Categorized by Use
Steel pipes can be categorized by application into: pipeline steel pipes, thermal equipment steel pipes, mechanical industry steel pipes, oil and geological drilling steel pipes, vessel steel pipes, chemical industry steel pipes, and steel pipes for special purposes.
