As progress continuallyplaces demands on thegeardesignerto makegearingthatissmaller, lighterand more reliable,
thedemandfor bettergearmaterialsand heattreatprocesses increases.Properhardnessofagear,both inthetoothand in
the body is becoming increasingly critical sinceload carrying capacity is dependenton hardness.
The scope of this paperis limited to the mostcommon methodsof heat treatmentof steelgearing, yetwithin this area
there are still many methods of heat treatment in wide use throughoutthe industry. The fact that there are so many
methods in use is testimony to the shortcomings of each process. When a designer selects the material and heat
treatment to be used, among the considerations are thesize of the gearand thegeartooth, facilifes availablefor heat
treatment, the overall cost associated with the material and process, and the reliability which is required by the
application of the gear.

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