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How long should a steel component be heat treated before nitriding?

How long should a steel component be heat treated before nitriding? Correct Answer 40-100 hours

Before nitriding is carried out, it is required that the workpieces are heat treated to produce the required properties in the core. The parts are heat treated at around 500oC for a period of 40 to 100 hours. This process takes place in a gas-tight chamber through which ammonia gas is allowed to circulate.

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Assertion: a : During hardening of steel, the component to be heat treated is strongly agitated in the quenching medium.
Reason : r : The agitation breaks down the vapour barrier allowing the quench to proceed at a more rapid rate.