Process for producton of compacted graphite iron

Abstract

A process for production of compacted graphite iron using in-mould addition of a magnesium alloy is disclosed. The process is characterised by a step of pre-treating the base iron in a ladle or in a furnace with an alloy containing cerium and performing a structure forming treatment in a reaction chamber in the mould using an alloy containing magnesium and lanthanum.

1 . A process for production of compacted graphite iron using in-mould addition of a magnesium alloy comprising pre-treating the base iron in a ladle or in a furnace with an alloy containing cerium and performing a structure forming treatment in a reaction chamber in the mould using an alloy containing magnesium and lanthanum. 
     
     
         2 . The process of  claim 1 , wherein the base iron is pretreated with an alloy containing cerium in order to reach cerium levels between 0.008 and 0.025% and the iron is further treated in the casting mould using an alloy containing 3-6% magnesium and 0.5-1.5% lanthanum. 
     
     
         3 . The process of  claim 1 , wherein the minimum percentage of cerium in the base iron is estimated as (% S−0.006)*2.9+0.01), where S is the sulphur content in the iron before the addition of cerium. 
     
     
         4 . The process of  claim 2 , wherein the minimum percentage of cerium in the base iron is estimated as (% S−0.006)*2.9+0.01), where S is the sulphur content in the iron before the addition of cerium.