Carbonitriding is an essential heat treatment process in the bearing industry for achieving wear resistance while increasing surface hardness yet keeping the core robust and soft. Any variations in the heat treatment processes have an impact on the mechanical characteristics. Bearing steel grade SAE52100 undergoes carbonitriding heat treatment process in an established batch type furnace at the supplier’s location and then another step of hardening and tempering is performed in house at SKF, Bangalore. Considering the higher volume of carbonitriding bearing material in demand in the future, research was conducted to determine the productivity of carbonitrided rings. The key objective of this project is to investigate the variation in product (inner ring) characterization and compare the similar heat treatment process variables with different types of furnaces by using a continuous type furnace as opposed to an existing batch type furnace, in addition to perform product (bearing ring) characterization of the carbonitrided heat-treated samples of the two furnaces and a productivity comparison of the two furnaces in producing carbonitrided rings. Various characterisation techniques were used to examine heat-treated samples derived from two types of furnaces, namely the continuous type furnace and the seal quenched furnace. These methods included using a Vickers hardness tester to determine hardness levels. In addition, case depth measurement was acquired after 60 minutes of supplementary tempering at 480°C in a muffle furnace. A light optical microscope was also used to examine the carbide-free layers and the uniformity of the carbonitriding layer. For the both the furnace samples, microstructural characterization was performed. Important observations included reduction of process cycle, comparison of production output of the furnaces, hardness values, microstructure ratings and case depth values met the SKF carbonitriding product specification. However, it was observed that in samples from a continuous furnace there were no carbide-free layers at the surface raceway and a non-uniform carbonitriding depth throughout the racetrack, which is detrimental to the material and grinding wheel as the next manufacturing phase is hard machining. In this thesis, preliminary research and product characterization were conducted and analysed, and the results are thoroughly documented. Additional research and testing can be conducted in the future to improve the efficiency of process heat treatment, perform bearing life cycle study, surface residual stress study, and industrialize the process.