Categorized by manufacturing process

Manufacturing processes for seamless steel tubes can be categorized into the following 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 pipes, spiral welded pipes, plate-to-roll butt-welded pipes, and hot-expanded welded 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 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 Application

Steel pipes are categorized by their applications, including: pipeline steel pipes, heat exchange equipment steel pipes, machinery industry steel pipes, oil and geological drilling steel pipes, vessel steel pipes, chemical industry steel pipes, and steel pipes for special uses.