PRODUCTION OF NODULAR CAST IRON BY INJECTION OF MAGNESIUM POWDER

Research Paper Submitted to

First Metallurgical Conference

Cairo 12-15 June 1971

By

MORSY I.M., KHALIL S.E. And VISHKARIEV A.P.

EL-TABBIN METALLURGICAL INSTITUTE FOR HIGHER STUDIES

SUMMARY

Factors influencing the production of nodular graphite cast iron in Cairo Foundries of El-Nasr Casting Company were investigated. The applied technique was the injection process, which was done by introducing pure magnesium powder into the melt through a graphite tube using nitrogen as a carrier gas.

Due to the high sulfur content of the produced cast iron during the period of investigation, some trials for desulphurization were carried out, prior to treatment with magnesium. It was shown that better desulphurization can be obtained by increasing the blast temperature of the cupola, or by ladle treatment. The addition of flurospar or increased amount of line stone in cupola charge did not give a sizable effect.

The injection of 4 kg of magnesium powder per one ton of cast iron gave a 100% spheroidal graphite cast iron. The recovery of magnesium that has been obtained was found 27.5% irrespective to the high sulfur content in the base cast iron to be treated.

At the present time it is easier to obtain nodular cast iron as the sulfur content is low.

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