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Difference Between Cast Irons and Cast Alloys

Source: | Updated: Feb 08, 2017

Casting is usually used to make components with complex shapes or with properties which cannot be achieved in other ways. In many cases, the cast alloy composition is similar to that of the wrought alloy but with adjustments to suit the casting process.These adjustments are reflected in the mechanical properties and corrosion resistance which may not be identical to those of the wrought alloy. Particular attention must be paid to the casting process in order to obtain the required component performance.

Cast versions of corrosion resistant nickel alloys are used for pumps, valves and other components in the chemical and related industries.
Heat resistant cast alloys are used in the chemical and petrochemical industries as well as in industrial furnaces.

Nickel-containing cast irons are used both for corrosion resistance in seawater pumps and for wear resistance in, for example, ore crushing.

Both single crystal and directionally solidified superalloy castings are used for turbine blades in the hottest parts of gas turbines. These eliminate transverse grain boundaries, which would be sources of weakness at the enormous tensile stresses experienced by the blades. The alloy compositions are closely tailored to both the production processes and operating conditions.

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