Patent ID: 6221184
Filing Date: 2001-04-24
Classification: C21D

Abstract:
A process for producing cast wearing parts of high-carbon alloy steels having the composition expressed in weight % of:carbon 0.6 to 2% manganese 0.5 to 6% chromium 1 to 6% silicon 0.4 to 1.5%the balance being iron with the usual impurity contents, showing as structure selected from the group consisting of:a non-equilibrium structure of fine pearlite, containing between 1 and 1.5% by weight of carbon with a hardness lying between 47 and 54 RC; non-equilibrium.a high non-equilibrium carbon austenitic structure with a hardness lying between 15 and 30 RC; non-equilibriuma high carbon martensitic structure with a hardness lying between 60 and 65 RC,comprising the steps of subjecting steel of the indicated composition, after casting and complete solidification, to a cooling from a temperature of at least 900.degree. C. at a cooling rate lying between 7.5 and 1.0.degree. C./sec down to 500.degree. C. and a cooling rate lying between 2.degree. C. and 0.4.degree. C./sec from 500.degree. C. to room temperature.