1. Materials can be categorized as: galvanized pipe, aluminum-zinc coated pipe, zinc-aluminum-magnesium coated pipe, aluminum pipe, stainless steel pipe, etc.

2. Categorized by cross-sectional shape

(1) Simple Cross-Section Steel Tubes - Round Steel Tube, Square Steel Tube, Elliptical Steel Tube, Triangular Steel Tube, Hexagonal Steel Tube, Rhombic Steel Tube, Octagonal Steel Tube, Semi-Circular Steel Tube, Others

(2) Complex Section Steel Tubes - Unequal Hexagonal Steel Tubes, Five-Petal Plum Steel Tubes, Double Bulge Steel Tubes, Double Concave Steel Tubes, Walnut-Shaped Steel Tubes, Conical Steel Tubes, Wavy Steel Tubes, Shell Steel Tubes, Others

3. Categorized by Wall Thickness - Thin-Walled Steel Pipes, Thick-Walled Steel Pipes

4. Categorized by Application - Pipe Steel for Pipelines, Heat Exchanger Steel Pipe, Steel Pipe for Mechanical Industry, Oil & Gas Drilling Steel Pipe, Container Steel Pipe, Chemical Industry Steel Pipe, Special Purpose Steel Pipe.