Induction hardening
Induction hardening is a method of surface-hardening in which the part to be surface-hardened is placed within an inductor coil through which a high frequency current is passed.
Induction hardening is a process used for the surface hardening of steel and other alloy components. The parts to be heat treated are placed inside a water cooled copper coil and then heated above their transformation temperature by applying an alternating current to the coil.
723 Degree Centigrade
The lower critical temperature is same for all steels Lower critical temperature for steels austenite-to-pearlite transformation is 1333 ºF (723 ºCelsius). Below this temperature, austenite doesnot exist.
To change the mechanical properties of steel
Heat treatment is the process of heating and cooling metals to change their microstructure and to bring out the physical and mechanical characteristics that make metals more desirable. The temperatures metals are heated to, and the rate of cooling after heat treatment can significantly change metal's properties.