The process of hardening of steels at A. J. Heat Treatment is carried out by heating the components of carbon and low alloy steels to temperatures between 810^C to 910^C.

After Hardening, tempering is necessary to reduce the brittleness of hardening and achieve the requisite mechanical properties. The material is reheated to tempering temperature between 150^C to 750^C..

This is a process similar to hardening where material is heated to austenizing temperature and carbon diffusing atmosphere is maintained in a carburising furnace. The carburising is carried out between 900^C to 940^C and Carbonitriding at 810-860 °C.