1、Classification by production method:
(1) Seamless tube – cold-drawn tube, extruded tube, cold-rolled tube.
(2) Welded tube mills
(a) Classification by process – gas shielded welded pipe, arc welded pipe, resistance welded pipe (high frequency, low frequency).
(b) By welding seam – straight seam welded pipe, spiral tube mills.
2. Classified by section shape:
(1) Round steel tube mills
(2) Rectangular tube mills.
3.According to the classification of wall thickness – thin-walled steel tube mills, thick-walled steel tube mills
4.According to the classification of use:
(1) Civil tube into round, rectangular, flower tube, generally used for decoration, construction, structure, etc.;
(2) Industrial pipe: industrial piping with steel tube mills, general piping with steel pipe (drinking water pipe), mechanical construction fluid transfer tube, boiler heat exchange tube, food sanitation tube, etc. Generally used in various fields of industry such as: petrochemical, paper, nuclear energy, food, beverage, pharmaceutical and other industries with high requirements for fluid media tube mills.