Steel pipe classification


1. Classified by production method.

1) Seamless steel pipe: hot rolled seamless steel pipe, cold rolled seamless steel pipe, cold drawn seamless steel pipe, extruded seamless steel pipe, pipe-jacking.

2) Welded steel pipe

(a) According to the technological points: Electric arc welding tube, resistance weld pipe (High frequency resistance welded pipe , Low frequency resistance welded pipe), gas welded pipe, furnace welded pipe.

(b) According to the weld seam: longitudinal welded pipe, spiral welded pipe.


2. Classified by section shape.

1)Simple section steel pipe: circular steel pipe, square steel pipe, oval steel pipe, triangular steel pipe, hexagonal steel pipe, rhombic steel pipe, octagonal steel pipe, semicircular steel pipe and others.

2) Steel tube with complex section: non-equilateral hexagonal steel pipe, five-petal quincunx steel pipe, double convex steel pipe, double concave steel pipe, melon seeds-shaped steel pipe, conical steel pipe, corrugated steel pipe, watchcase steel pipe and others.

3. Classified by wall thickness.

Thin-wall steel tube, thick wall steel pipe.

4. Classified by application.

Steel pipe used for pipeline, steel pipe for thermal equipment, steel pipe for mechanical industry, steel pipe for petroleum and geological drilling, container steel pipe, steel pipe for chemical industry, special purpose steel pipe and others.