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Special-shaped seamless steel pipe is widely used in various structural parts, tools and mechanical parts. Compared with the round tube, the special-shaped tube generally has a larger moment of inertia and section modulus, a larger bending and torsional resistance, which can greatly reduce the weight of the structure.
Special-shaped seamless steel pipe is the general name of seamless steel pipe with other section shapes except round pipe. According to the different shapes and sizes of steel pipes, it can be divided into 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).