1. Electroplating
  2. Cyaniding
  3. Induction hardening
  4. Nitriding

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Answer: Option 1

Case Hardening, is a heat treatment process that produces a surface which is resistant to wear, while maintaining toughness and strength of the core. This treatment is applied to low carbon steel parts after machining, as well as high alloy steel bearings, gears, and other components.

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