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Melt
Quality Control In Induction Furnace |
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By:
Dr.P.K.
Basutkar |
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Dr.
Basutkar explains in this lecture: |
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Various
factors which determine the melt quality of cast iron
(including S.G. Iron) and |
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How
to control these various factors. |
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This
lecture gives very specific information and technical
details,
which will be immensely
useful for practicing foundrymen. |
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Contents
- Furnaces used : |
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Advantages
of medium frequency furnace over mains frequency furnace. |
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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. |
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Desulphurization
: Steps in desulphurisation, Quality of desulphurisers,
temperature of melt, deslagging etc. |
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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. |
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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. |
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Control
for producing S. G. Iron. |
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Metal temperature which controls Magnesium recovery. |
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Weight of liquid metal treated. |
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Composition of nodulizer - percentage Mg in alloy. |
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Pouring techniques to give minimum fading effect. |
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Proper residual Mg to give desired microstructure in
as cast condition. |