Induction tempering is a heat treatment process usually performed following a process of induction hardening, atmospheric carburizing, or carbonitriding, in order to achieve the desired ductility, hardness/stiffness ratio.
In order to achieve the desired range of hardness, or to add stiffness to a part while increasing malleability. Induction tempered steel is usually done in furnaces that may have an option for protective gases. The protective gas will keep the surface from oxidizing throughout the process and is mostly used at higher temperatures. A lower frequency achieves results within seconds, as opposed to furnace-tempered applications which usually require hours.
For certain types of steel, holding time in a tempering temperature is very important; extended holding times will be appropriate at higher temperatures. Depending on the steel grade used there is a phenomenon known as tempering frostiness that may arise in specific temperature ranges. Tempering within these temperature intervals should generally be avoided. These areas are shown in a steel suppliers’ catalogue of steels, along with their most appropriate temperatures. Depending on the requirements for hardness induction tempering can be performed on all components, such as bars, joints, and shafts. Tempering improves both material hardness and wear resistance.
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