Ferrous Materials and Non-Ferrous Metals and Alloys 1 introduction

(3) High temperature tempering:

 It is done between temperature of 500 to 650°C which

completely eliminates internal stresses and provides toughness. Hardness is practically

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28 Manufacturing Processes

Due to prolonged heating during carburizing process grains of core become relatively

coarse and refinement of core is essential. Refining of components is achieved by heating

them to 850°C then cooling in air or quenching it in oil.

In this manner carburizing provides a hard case with a soft core. If there is brittleness

of core it is removed by tempering normally between 180°C–270°C.