1. TITLE:- Metallurgy
TOPIC:- Cast Iron
Presented by : Lokesh Wagh (01) (1701010920
Sankalp Adhav (02)
Vaibhav Patil (04)
Ankita Adgaonkar (11) (170101092017)
Guided by :- Dr. D. G.Patil
Class :- DSE MECH A
SANDIP UNVERSITY
SCHOOL OF ENGINEERING AND
TECHNOLOGY
2. Cast Iron
Iron with 1.7 to 4.5% carbon and 1 to 3% silicon.
The three main ingredients are
1. Iron
2. Carbon
3. Silicone
3. Composition Of Cast Iron
Carbon - 1.7 to 4.5 %
Silicone- 1 to 3 %
Manganese - 0.5 to 1 %
Phosphorus – 0.1 to 0.9 %
Sulphur – 0.07 to 0.10 %
5. Grey Cast Iron
Iron – Carbon alloys containing flakes of graphite
embedded in steel matrix which show a grey
blackish coloured fracture due to presence of
graphite.
The strength of grey iron mostly depends on the
strength of steel matrix and the size and graphite
flakes in it.
NAME COMPOSITION
CARBON 2.4 – 3.8 %
SILICON 1.2 – 3.5 %
MANGANESE 0.5 – 1 %
SULPHUR 0.06 – 0.12 %
PHOSPHORUS 0.1 – 0.9 %
7. White Cast Iron
These are iron carbon alloys having more than
2.11% of carbon.
All the carbon present in the form of combine
cementite which makes the fracture of these alloys
to have dull and white colour. And that’s why they
are called as White irons.
NAME COMPOSITION
CARBON 2.5%
MANGENESE 0.4 %
CHROMINUM 17%
SILICON 1.3%
PHOSPORUS 0.15%
SULPHUR 0.15%
MOLYBEDINUM 0.5 %
9. Ductile Cast Iron
In ductile irons, the graphite is in the form of
spherical nodules rather than flakes (as in grey
iron ) thus provides the ductility.
Better ductility than grey cast iron
NAME COMPOSITION
Iron Carbon 3.3 - 3.4%
Silicon 2.2- 2.8 %
Manganese 0.1- 0.5%
Phosphorus 0.005-0.04 %
Sulphur 0.005-0.02 %
10. Applications
o In automotive industry 55% of ductile iron used
Crankshaft
Front wheel spindle supports
o Pipe and pipe fittings ( joined by welding)
11. Malleable Cast Iron
Graphite in nodular form
Produced by heat treatment of white cast iron
Similar properties to ductile iron
NAME COMPOSITION
Carbon 2-2.65 %
Silicon 0.90-1.40 %
Manganese 0.25-0.55%
Phosphorus Less than 0.18%
Sulphur 0.05%
13. Properties Of Cast Iron
Strong in compression but weak in tension
Does not rust easily
Low melting point
Hard but brittle also
Shrinks on cooling
Cast iron having iron with carbon 1.7 – 4.5 % and also 1-3% silicon also its has three main contents ie iron carbon and silicon
The classification of cast iron has mainly four types ie grey cast iron, white cast iron, ductile cast iron and malleable cast iron
The fig shows the flakes of graphite embedded in steel matrix which has grey blackish colour hence called as grey cast iron
Fig shows the white cast iron it is called white CI because it contains cementite and also has iron carbon alloys
Fig shows the ductile cast iron in the form of spherical nodules hence also known as nodular cast iron this iron has the property of ductility that is can be drawn into wires hence this has wide applications
Fig shows malleable cast iron it is produced by heat treatment of white CI also has nodular structure
When applied force in push type it is strong whereas while applying force in pull type it breaks easliy also it is rust free and has low melting point hence has a wide applications in railway and cookwares
Can me casted and machined easily also has low stress concentration
Heavy in weight also brittle as weak in tension hence cannot be stretched
