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The crown wheel and pinion represent the most highly stressed parts of a heavy vehicle; these are typically made of 815M17 steel.  The modern processes employed to transform these items into highly durable components include both cryogenic treatment and conventional heat treatment.  These processes help to convert retained austenite into martensite and promote carbide precipitation.  Furthermore, Cryogenic Processing increases resistance to cycle fatigue and abrasive wear, with no significant impact on tensile strength of the steel.