nodular cast iron, graphite, high standard of ligand with austenitic structure, use of the pig iron for the manufacture of structural components and structural component produced with the cast iron

摘要

The present invention relates to a high-alloy spheroidal graphite cast iron having an austenitic structure comprising the following ingredients in the following percentages by weight: Chrome (Cr) ranging from 1,6% to 2,0%, Molybdenum (Mo) ranging from 0,9% to 1,1%, Niobium (Nb) ranging from 0,3% to 0,5%, Nickel (Ni) ranging from 34% to 36%, Silicon (Si) ranging from 6,1% to 6,7%, Carbon (C) ranging from 1,6% to 2,0%, Tungsten (W) ranging from 0,5% to 0,7%, Manganese (Mn) ranging from 0,5% to 0,65%; the present invention relates also to a structural component intended to operate in the temperature range of exhaust gases ranging from 920°C to 1020°C and particularly for exhaust manifolds, turbines and/or turbo manifolds for automotive industry.