SHEROIDAL SMELTING PARTICULARLY FOR SEGMENTS OF PISTON AND METHOD FOR THAT PRODUCTION.

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Particularly suitable sheroidal smelting for segments of pistons, including/understanding in percentage of weight, 3, 20 4, 20 carbon, 2, 00 4, 00 silicon, up to 0, 10 phosphorus, up to 0, 10 sulphur, up to 0, 20 manganese, up to 1, 30 receive, up to 0, 50 chromium, 1, 7 to 5, 00 nickel and rare earth metals, 0, 10 to 2, 00 molybdenum, 0, 1 to 2, 0 titanium more vanadium more niobium, up to 0, 20 cobalt and up to 1, 00 boron and calcium the balance being inevitable iron and impurities, the matrix having an austempering-austenitic structure with a percentage of austenite among 20 and 40% in weight.