Patent ID: 8709175

Claim:
A piston for an internal combustion engine comprising a ring carrier, the ring carrier being formed of a cast iron alloy comprising the following composition in weight %: C: 2.2-3.8%, Si: 1.0-2.8%, Mn: 1.0-2.0%, Cr: 1.0-2.6%, Ni: 9.0-13.5%, Cu: 5.0-8.5%, B: 0.005-0.1%, Zr: 0.01-0.1%, Nb: max. 0.4%, Ti: max. 0.3%, Mo: max. 0.5%, V: max. 0.5%, Ca: max. 0.01%, S: max. 0.10%, P, wherein the P is max. 0.08%, present in an amount of: the remainder is Fe and unavoidable impurities, and wherein the cast iron alloy contains graphite exclusively in the form of lamellar graphite precipitation, and wherein the portion of the piston surrounding the ring carrier is formed of NiCuCr1562, and wherein the ring carrier is cast into the piston such that the stresses in a transitional area formed between the cast-in ring carrier and the piston material are avoided, thus significantly reducing crack formation and avoiding separation of the ring carrier from the piston material and avoiding the piston malfunctioning as a result.