Steel pipes, non-standard shapes can be ellipticalSpecial-shaped steel pipeTriangle-shaped extruded steel pipes, hexagonal extruded steel pipes, diamond-shaped extruded steel pipes, octagonal extruded steel pipes, half-circular extruded steel rounds, uneven-sided hexagonal extruded steel pipes, five-petaled plum blossom-shaped extruded steel pipes, double-convex extruded steel pipes, double-concave extruded steel pipes, melon-shaped extruded steel pipes, conical extruded steel pipes, corrugated extruded steel pipes.