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Ductile Iron Key
Benefits |
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Grey Iron
Ductile Iron
Ni-Resist
Ductile Ni-Resist
Ni-Hard
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Capacities:
- Ductile Iron offers the design engineer
a unique combination of a wide range of high strength, wear
resistance, fatigue resistance, toughness and ductility in addition to
the well-known advantages of cast iron - castability, machinability,
damping properties, and economy of production.
- Ductile Iron offers the designer the
option of choosing high ductility, with grades guaranteeing more than
18% elongation, or high strength, with tensile strengths exceeding 120 ksi (825 MPa). Austempered Ductile Iron (ADI), offers even greater
mechanical properties and wear resistance, providing tensile strengths
exceeding 230 ksi (1600 MPa).
- In addition to the cost advantages
offered by all castings, Ductile Iron, when compared to steel
and Malleable Iron castings, also offers further cost savings. Like
most commercial cast metals, steel and Malleable Iron decrease in
volume during solidification, and as a result, require attached
reservoirs (feeders or risers) of liquid metal to offset the shrinkage
and prevent the formation of internal or external shrinkage defects.
The formation of graphite during solidification causes an internal
expansion of Ductile Iron as it solidifies and as a result, it may be
cast free of significant shrinkage defects either with feeders that
are much smaller than those used for Malleable Iron and steel or, in
the case of large castings produced in rigid molds, without the use of
feeders. The reduction or elimination of feeders can only be obtained
in correctly design castings. This reduced requirement for feed metal
increases the productivity of Ductile Iron and reduces its material
and energy requirements, resulting in substantial cost savings. The
use of the most common grades of Ductile Iron "as-cast"
eliminates heat treatment costs, offering a further advantage.
- Mesa Castings uses coreless induction
furnaces in the production of Ductile Iron. At Mesa Castings charge
component selection and other production considerations are treated
with extreme care to ensure that the chemistry and resultant physical
and mechanical properties of the finished casting meet each customers
specifications.
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