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DUCTILE
IRON AND ITS ADVANTAGES |
GREY CAST IRON VS DUCTILE IRON
Back in 1948, it was
discovered that addition of magnesium in the molten metal could significantly alter the
graphite structure in Cast Iron. In the initial microstructure of grey cast iron, graphite
was in the form of flakes but assumed a spherical/nodular shape after the inclusion of the
magnesium. The mechanical properties of ductile iron as compared to gray cast iron
show superior tensile strength, yield strength, ductility and impact resistance. The use
of ductile iron has grown at a rapid rate over the past fifty years. The much improved
properties were recognized to be of particular benefit in the centrifugal pipe industry
and as such most of the pipe production is now in ductile iron.
PROPERTIES & ADVANTAGES
OF DUCTILE IRON PIPE
- High tensile strength and High yield
strength
- High impact resistance and fatigue
resistance
- High elongation (ductility)
- Good Resistance to handling / transportation
damage
- Simple Push-on type jointing System
- Offers considerable joint deflection
- Even unskilled workers can join the pipes
- Special Joints available to resist
longitudinal joint withdrawal.
- Reliable and cost effective internal and
external corrosion protection.
- Resistant to stray current effect due to
electrical discontinuity at joints
- Impermeable to gas and organic contaminant
- Imported back-fill not normally required
- Full range of ductile iron fittings
available
- Easy pipe location when buried
- Under pressure connections can be provided
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