Categorized by manufacturing processes

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

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

By Shape Classification

Steel pipes can be categorized by shape, including round pipes, square pipes, rectangular pipes, octagonal pipes, hexagonal pipes, D-shaped pipes, pentagonal pipes, and various shaped 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 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 special-purpose steel pipes, etc.