Materials and Construction
Cementite is

Fe₃C chemically
A compound of carbon and iron
All of these
Characterised by an orthorhombic crystal structure

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Materials and Construction
Monel alloy is

Not used in cast and wrought forms
Not suitable for making kitchen utensils
The costliest of all the alloys of nickel
Used for making steam valves and turbine blades as it resists steam attack at high temperature

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