1、According To Production Methods Classification
（1）Seamless Pipe – Hot-Rolled Pipes, Cold-Rolled Pipes, Cold-Drawn Tubes, Extruded Tubes, Pipe Jacking
（2）Welded Pipe
（A）In Accordance With Sub-Processes – Arc Welded Pipe, ERW Pipe (High Frequency, Low Frequency), Gas Pipe, Furnace Pipe
（B）By Weld Points – Longitudinal Welded Pipe, Spiral Welded Pipe
2、In Accordance With Section Shape Classification
（1）Easy-Section Steel Tube – Circular Steel Tube, Square Steel Pipe, Steel Tube Oval, Triangular Steel Pipe, Steel Pipe Hexagonal, Diamond-Shaped Steel Tube, Steel Pipe Octagonal, Semi-Circular Steel, Other
（2）The Complexity Of Cross-Section Steel Tube – Scalene Hexagonal Steel Pipe, Five Plum-Shaped Steel Tube, Steel Tube Double-Convex, Double Concave Steel Pipe, Melon-Shaped Steel Tube, Conical Steel Pipe, Corrugated-Shaped Steel Tube, Steel Pipe Watchcase, Other
3、Classified According To Wall Thickness – Thin-Walled Steel Pipe, Thick-Walled Steel Pipe
4、By End-Use Category – Pipe With Steel Pipe, Steel Pipe For Thermal
Equipment, Machinery For Industrial Use Steel Pipes, Petroleum, Geological Drilling Using Steel Pipe, Steel Tube Container, Chemical Industrial Steel Pipes, Special-Purpose Steel Pipes, Other