Categorized by manufacturing process

Manufacturing processes for seamless steel pipes can be categorized into the basic types: hot rolling (extrusion), cold rolling (drawing), and hot expanded pipes.

(2) Welded pipes can be categorized by manufacturing process into: straight seam welded pipes, spiral welded pipes, plate and coil butt-welded pipes, and hot-expanded welded pipes.

By Shape Category

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, complex cross-section pipes, double concave pipes, five-petaled plum blossom-shaped pipes, conical pipes, corrugated pipes, melon-shaped pipes, double convex pipes, etc.

Categorized by Usage

Steel pipes are categorized by their applications, including pipeline steel pipes, thermal equipment steel pipes, machinery industry steel pipes, oil and geological drilling steel pipes, container steel pipes, chemical industry steel pipes, and steel pipes for special purposes.