Flame Hardening

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This technique is applied for hardening only some of the metal`s portion. It is different from differential hardening, in which heating is applied to entire metal and then cooled-down at varying rates. In the flame hardening technique, a separate portion of metal is kept subject to heating before quenching. This process is easier as compared to differential hardening, it however produces extremely brittle-zone between heated & unheated metal, because cooling at this heat affected area is very rapid.