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This method of hardening is as follows:

The components are immersed in a bath of Sodium Cyanide at a temperature of just over 900°C. Cyanide contains carbon and nitrogen both of which are active carbonizing agents. In a very short time, the components can be removed from the bath and quenched and a reasonably thick hard case will be present. In two hours, a case of about 0.222" can be formed, at a temperature of 900°C. The treatment is complete after quenching in oil or water.
The advantages of this method are:

  1. The speed at which hardening can be carried out.
  2. Distortion can be kept to a minimum (work suspended or in the basket).
  3. The bright finish of the parts is maintained.

Disadvantages - Expensive, dangerous fumes, salt clings to parts causes splitting during quench, require gloves and goggles, salt contaminated quench bath.

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