Categorized by manufacturing process

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 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 tubes, square tubes, rectangular tubes, octagonal, hexagonal, D-shaped, pentagonal and other special-shaped steel pipes, complex cross-section steel pipes, double concave tubes, five-petal plum blossom-shaped tubes, conical tubes, corrugated tubes, melon-shaped tubes, double convex tubes, etc.

Categorized by application

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.