ES422969A1 - Procedure for the production of foundry with spheral graphite. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Process for the production of cast iron with spheroidal graphite, easily machinable, resistant to abrasion, of the type containing 2.6 to 2.8% c, from 4.0 to 4.5% si, from 0.1 to 0, 2% of mn, 0.15 to 0.25% of cr, 0.03 to 0.06% of s, 0.05 to 0.08% of p and its structure is composed of the metallic matrix in the form of silicon ferrite, by spheroidal releases of graphite as well as carbon, bound in the form of eutectic and hypereutectic alloy cementite with perlite traces up to approximately 3%, characterized in that the metallic charge composed of low manganese crude melt, of steel scrap, cast iron scrap, ferrochrome and ferrosilicon is melted in an induction furnace and after melting it contains 2.7 to 2.9% c, from 2.4 to 2.9% of si, from 0.1 to 0.2% of mn, from 0.10 to 0.20% of cr, approximately 0.07% of s and 0.06 of p, obtaining the silicon content of 4.0 to 4.5% during spheroidization by the addition of ferro-silica-magnesium prealloy in the amount of 2.5 to 3.0% per ton of liquid smelting, which contains on average 45% si and 8% mg, while the chromium content of 0.15 to 0.25%, is completed after spheroidization by the addition of ferrochrome containing an average of 60% cr. (Machine-translation by Google Translate, not legally binding)