1. Welded pipe according to the manufacturing process can be divided into:①Straight Seam Welded Steel Pipe;②Coil Butt Welded Steel Pipe;  ③Submerged Arc Welding Steel Pipe;④Welded Pipe Hot Expansion Steel Pipe

2. Stainless steel pipe fittings manufacturing process is divided into: Hot Rolling (extrusion), Cold Rolling (drawing), Hot Expanding Steel Pipe Etc.

3. According to the shape of steel pipe can be divided into square pipe, rectangular pipe, octagonal, hexagonal, D-shaped.Complex section steel pipe, Double Concave Steel Pipe, five valve plum shaped steel pipe, Conical Steel Pipe, Corrugated Steel Pipe, Melon Shaped Steel Pipe, Double Convex Steel Pipe, etc.

4.Classification by use - Steel pipes for pipes, Steel pipes for thermal equipment, Steel pipes for machinery industry, Steel pipes for petroleum, geological drilling, Container steel pipes, Steel pipes for chemical industry, Steel pipes for special purposes and Others