Structure and mechanical properties as well as application of high quality vermicular cast iron

The results of studies on the use of magnesium alloy in modern cored wire injection method and Tundish for production of vermicular graphite cast irons were described. The injection of Mg cored wire length is a treatment method which can be used to process iron melted in an electric induction furnace. This paper describes the results of using a high-magnesium ferrosilicon alloy in cored wire (Mg recovery 55%) for the production of high quality vermicular graphite cast irons at foundry. The results of calculations and experiments have indicated the length of the cored wire to be injected basing on the initial sulfur content and weight of the treated melt. The paper presents a microstructure matrix and vermicular graphite in standard sample and castings with different wall thickness. The results of numerous trials have shown that the magnesium cored wire process can produce high quality vermicular graphite with ferritic-pearlite and pearlitic-ferrite matrix irons under the specific industrial conditions.