Abstract: A device for changing the rolling mandrels of a plug mill. The device including the following arrangement of stations in series. An entry station for feeding the rolling mandrels into the feeding channel of the plug mill, a run-out station for the used rolling mandrels after rolling, and a transfer device for guiding the mandrels into a cooling station. The cooling station undertakes controlled cooling of the rolling mandrels, preferably by a water/air mixture. At the same time, devices remove the scale by joint application of water and mechanical aids. Finally, a drying station dries the cooling water from the surface of the rolling mandrels.