... 35CrMo, 42CrMoGB/T8162Mechanical parts,Fittings,Network frameSpecial shaped seamless pipe is the general name given to pipes of any ... , tools and mechanical parts. Compared to the round pipe, it generally has higher moment of inertia, section ... weight of structure and save steel.square pipe, rectangular pipe, elliptical pipe, light elliptical pipe, semicircular pipe and other more than one hundred ...