1. Seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, and extruded pipes according to different production methods.
2. According to the shape, there are round tubes and special-shaped tubes. In addition to square tubes and rectangular tubes, special-shaped tubes also include oval tubes, semicircular tubes, triangular tubes, hexagonal tubes, convex-shaped tubes, plum-shaped tubes, etc.
3. According to the different materials, it is divided into ordinary carbon structure pipe, low alloy structure pipe, high-quality carbon structure pipe, alloy structure pipe, stainless steel pipe, etc.
4. According to the special purpose, there are boiler tubes, geological tubes, oil tubes, etc.
