I. Classification by use-steel pipes for pipes, steel pipes for thermal equipment, steel pipes for machinery industry, petroleum, steel pipes for geological drilling, container steel pipes, steel pipes for chemical industry, steel pipes for special purposes, others
Classification by production 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
1.Simple section steel pipe-round steel pipe, square steel pipe, oval steel pipe, triangular steel pipe, hexagonal steel pipe, diamond steel pipe, octagonal steel pipe, semi-circular steel pipe, others
2.Complex section steel pipe-unequal hexagonal steel pipe, five petal plum steel pipe, double convex steel pipe, double concave steel pipe, sunflower seed steel pipe, conical steel pipe, corrugated steel pipe, case steel pipe, others
Classification by wall thickness-thin-walled steel pipe, thick-walled steel pipe
V. Classification by caliber-large-caliber seamless steel pipe, small-caliber seamless steel pipe
Plumbing pipes can be divided into PVC, PPR, PE and other types according to specific classification, and the classification forms are various.
