Materials and Construction
Lead

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

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Materials and Construction
Mild steel is

A high carbon steel (0.5 to 1.5% carbon)
Highly resistant to corrosion (as much as stainless steel)
Very poor in strength & ductility
A low carbon steel (0.05 to 0.3% carbon)

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