Categorized by manufacturing process

The manufacturing processes of 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 seam welded pipes, plate and coil seam welded pipes, and hot expanded welded 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 pipes, double concave tubes, five-lobed plum blossom-shaped tubes, conical tubes, corrugated tubes, melon-shaped tubes, double convex tubes, and more.

Categorized by Use

Steel pipes are categorized by application as: pipeline steel pipes, heat-exchange equipment steel pipes, mechanical industry steel pipes, oil and geological drilling steel pipes, container steel pipes, chemical industry steel pipes, and special-purpose steel pipes, etc.