How to classify seamless steel pipe?

1. Classification by consumption method
(1) Seamless pipe -- hot rolled pipe, cold rolled pipe, cold drawn pipe, extruded pipe, pipe jacking.
(2) Welded pipe
(a) According to the process -- arc welded pipe, resistance welded pipe (high frequency, low frequency), gas welded pipe, furnace welded pipe.
(b) According to the welding seam -- straight welded pipe and spiral welded pipe.

2. Classification by profile
(1) Complex section steel pipe -- round steel pipe, square steel pipe, elliptical steel pipe, triangular steel pipe, hexagonal steel pipe, diamond steel pipe, octagonal steel pipe, semicircle steel circle, others.
(2) Steel pipe with complex cross section -- unequal hexagon steel pipe, five petal quincunx steel pipe, double convex steel pipe, double concave steel pipe, melon seed steel pipe, conical steel pipe, corrugated steel pipe, case steel pipe, others.

3. Classification by wall thickness -- thin wall steel pipe, thick wall steel pipe.

4. Classification by use -- steel pipe for pipeline, steel pipe for thermal equipment, steel pipe for machine industry, steel pipe for petroleum and geological drilling, steel pipe for vessel, steel pipe for chemical industry, steel pipe for special use, others.