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In every conventional combustion engine, the piston is the element which transfers the energy supplied by the combustion process onto the conrod. In 2014, passenger car pistons made of steel were produced for the first time in series for a diesel application. This piston was designed as a single part. Due to an innovative combination of forging and machining processes, the part can be produced with an internal cooling duct in monoblock design. This renders the joint in the highly loaded combustion chamber unnecessary.