Abstract: A method for the thermal treatment of bushings, particularly for tracked vehicles and the like, which provides for a first step, during which external quench hardening of the bushing is performed by heating through to approximately {fraction (7/10-10/10)} of the thickness of the bushing, followed by cooling with quenching liquid; then a second step for internal quench hardening is performed by heating the bushing through to approximately {fraction (4/10-7/10)} of the thickness thereof and then cooling with quenching liquid; the method ends by performing a step for the stress relieving of the bushing. A product at low costs can thus be obtained which has better wear resistance and fatigue strength than observed in bushings obtained with conventional methods.

Abstract: A metalworking method, particularly for obtaining lengths of tube of various sizes and for various uses, made of steel having a carbon content between 0.10% and 0.50% with narrow tolerances. The method entails the provision, as initial material, of a round bar of hot-rolled steel, which is then peeled and cut so as to obtain at least one block, which is drilled and subjected to a chemical treatment. The block is then pressed and optionally subjected to final turning and heat treatment so as to obtain a finished product, such as a hydraulic or oleodynamic cylinder or a casing for high-pressure filters or a tube for high pressures, or a bushing, by using a reduced amount of steel.