Distinguish between hardening and normalising.

Distinguish between hardening and normalising.
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1 Answer

Answer :

Hardening
Normalizing
1. It is the process of heating steel at high temperature (800-9000C) and then suddenly cooled by dipping or quenching in some suitable medium.
1. It is the process of heating steel at a temperature of 500C above the critical temperature (7250C) and cooling it freely in air at a rate 50C/sec.
2. Steel becomes extremely hard and brittle.
2. Steel becomes tough, homogeneous and softer. 
3. Tensile strength is not developed.
3. Tensile strength is developed.
4. Mechanical properties are not developed.
4. Mechanical properties are well developed.
5. It requires very less time.
5. It requires more time than hardening.
6. It creates stresses in structure
6. It removes coarser grained structure.
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