1. Classification according to production method of CS steel pipe
(1) Seamless steel pipe includes hot-rolled pipe, cold-rolled pipe, cold-drawn pipe and extruded pipe.
(2) Welded steel pipe
(1) According to the technological process, there are arc welded pipe, ERW pipe (high frequency, low frequency), gas pipe and furnace pipe.
(B) Longitudinal welded pipe and spiral welded pipe through welded joint


2. Classification according to section shape
(1) Simple section steel, including round, square, elliptical, steel triangular, hexagonal, diamond, octagonal, semi-circular, and others.
(2) Complex section steel, such as equilateral hexagonal steel pipe, pentameric steel pipe, double-tube steel pipe, double concave steel, elliptical steel cone pipe, corrugated steel pipe, steel tube shell, etc.


3. According to wall thickness, there are thin-walled steel pipe and thick-walled steel pipe.
4. Applications include steel pipes, steel pipe thermal equipment, industrial mechanical drilling steel, petroleum, geological steel pipes, steel containers, steel pipe chemical industry, special purpose steel pipes, etc.