Hollow profile and method of its production

The thickness (f1) of end sections (14e,16e) of outer walls (14,16) is progressively reduced. Two outer walls of a metal alloy hollow section (11) opposite to each other and running parallel to each other are linked on the inner side by a shaped inner wall (26,28). The outer walls limit profiled cavities (12) with the inner walls. An independent claim is also included for a method for reshaping a metal alloy hollow section according to the present invention.