Answer is:
Case hardening
Explanation:
List of case hardening or surface hardening methods are
Carburising
Cyaniding
Nitriding
Induction hardening
Flame hardening
Answer is:
Copper
Explanation:
Key Properties of Copper
Excellent heat conductivity.
Excellent electrical conductivity.
Good corrosion resistance.
Good biofouling resistance.
Good machinability.
Retention of mechanical and electrical properties at cryogenic temperatures.
Non-magnetic
