Materials and Construction
Lead

Can not be scratched by finger nails
Is the lightest metal in common use
Is the hardest metal in common use
Can not be work hardened

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Materials and Construction
Monel alloy is

Not suitable for making kitchen utensils
Not used in cast and wrought forms
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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