Advantages of medium frequency furnace over mains frequency furnace.
Objectives of Melt Quality Control:Quality of charge materials used such as steel scrap, foundry returns ferro - alloys used, carburisers. Charging methods and sequence to reduce melting losses and give required chemical composition and temperature of liquid metal.
Desulphurization:Steps in desulphurisation, Quality of desulphurisers, temperature of melt, deslagging etc.
Metal Chemistry:Melt composition and temperature of metal. Various ranges of Carbon, Silicon, Manganese, Phosphorus, Chromium and other submersive elements like Pb, Bi, Sb, Ti and Al. Carbon Equivalent.
Magnesium treatment:Control of base liquid metal, temperature of liquid metal, nodulizing agents i.e. ferro - silicon Magnesium alloys, its composition. Controls required in Magnesium treatment - viz. temperatures method of Mg treatment recovery of Mg etc.
Control for producing S. G. Iron.
Metal temperature which controls Magnesium recovery.
Weight of liquid metal treated.
Composition of nodulizer - percentage Mg in alloy.
Pouring techniques to give minimum fading effect.
Proper residual Mg to give desired microstructure in as cast condition.