spheroidal cast iron particularly for piston rings and method for the production.

摘要

particularly suitable for piston rings spheroidal, comprising in weight percent, 3, 20 Is 4, 20 carbon, 2, 00 4, 00 silicon to 0, 10 phosphorus, to 0, 10 sulfur, to 0, 20 manganese , up to 1, 30 copper, to 0, 50 chromium, 1, 7-5, 00 nickel and rare earth metals, 0, 10 to 2, 00 molybdenum, 0, 1 to 2, 0 titanium plus vanadium plus niobium, up 0, cobalt and 20 to 1, 00 boron and calcium the balance being iron and unavoidable impurities, the matrix having a bainitic-austenitic structure with an austenite percentage of between 20 and 40% by weight.