What is special-shaped seamless steel pipe

The special-shaped seamless steel pipe is the general term of seamless steel pipe with other cross-section shapes except round pipe. According to the shape and size of steel pipe section, it can be divided into three types: equal wall thickness special-shaped seamless steel pipe (Code: D), unequal wall thickness special-shaped seamless steel pipe (Code: BD), variable diameter special-shaped seamless steel pipe (Code: BJ).

Special-shaped seamless steel pipe is widely used in various structural parts, tools and mechanical parts. Compared with the circular pipe, the special-shaped pipe has larger moment of inertia and section modulus, and has greater bending and torsion resistance, which can greatly reduce the structural weight and save steel.