(5) Flame Hardening:
It is the process of surface hardening in which hard wear resistant
layer on a tough core steel component is produced by application of heat with the flame
30 Manufacturing Processes
of an oxyacetylene torch and then cooling the surface by water. The flame is directed on
the desired part without heating the remaining portion of work efficiently to affect it.
The steel required for flame hardening normally contains 0.4 to 0.6 per cent of carbon.
The component or part is heated in the austenitic range. Since the heating is localized,
stresses are not developed, therefore, chances of distortion and cracking are reduced.
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