nodular cast iron and nodular cast iron to obtain process

摘要

nodular cast iron and nodular cast iron, the cast iron process to obtain nodular including: a metal plate martensite, bainiteperlitica or ferrite having a purity of about 99.6% in which the content of sulfur and phosphorus are maintained below 0.015% and 0.04%, respectively, from 10 to 12% by volume of graphite particles and from about 0.2 to 1.2% by volume of particles of the carbide of high hardness of mc.these particles are dispersed in the molten metal matrix, where m is at least one of the elements selected from the group consisting of ti, ta. zr, hf, v, and nb.the invention also concerns a process for nodular iron comprising the phases of: adding to a bath of grey cast iron containing less than 0.015% sulphur and less than 0.04% of phosphorus, a load between about 0.2 and 1.2% reported on weight of bath of at least one area having the formula fe - fe - fem and mc.where m is at least one of the elements selected from the group consisting of ti, ta, zr, hf,v and nb; carrying out at least one nodulizzazione of bathroom by inoculation of magnesium at low content of ferrosilicon in it; and passing the metal bath in the mold nodulizzato (fig. 2).