Body making part e.g. front wall, for front wall arrangement of motor vehicle i.e. passenger car, has board made of composite metal sheet and comprising continuous edge portion made of aluminum alloy and central portion made of steel

The part has a board made of composite metal sheet and comprising two planar portions such as continuous edge portion (30) made of aluminum alloy and a central portion (28) made of steel. The central portion comprises a frame tunnel. The edge portion comprises an attachment region for a side wall and a A-shaped pillar of a motor vehicle such that a front wall arrangement is connected to the A-shaped pillar through the edge portion. The central portion is imparted into the front wall arrangement. The body making part is selected from a group comprising front wall (12), cowl cross beam (18), front wall cross beam (20) and pedal bottom cross beam (22). Die Erfindung betrifft ein Karosseriebauteil (12, 18, 20, 22, 34, 38, 40) für einen Kraftwagen, insbesondere einen Personenkraftwagen, aus einem Verbundblech, insbesondere einer maßgeschneiderten Platine, mit wenigstens zwei flächigen Teilbereichen (28, 30) aus unterschiedlichen Metalllegierungen, wobei das Karosseriebauteil (12, 18, 20, 22, 34, 38, 40) zumindest einen randständigen Teilbereich (30) aus einer Aluminiumlegierung und einen dem gegenüber mittigen Teilbereich (28) aus einem Stahl umfasst.