The Austempering Processes

Carbo-Austempered™ Steel

This process develops a tough, high-carbon, bainitic case on high performance components.

Carbo-Austempered parts have remarkable impact properties that are superior to either neutral hardened or carburized steels. Carbo-Austempering is routinely applied to steel gears, shafts, and power transmission parts that undergo periodic overloading in service.


The Carbo-Austempering™ process is a high performance steel heat treatment that combines a high carbon bainitic case with either a bainitic or tempered martensitic core to produce a component with an exceptional combination of strength and toughness.

Carbo-Austempered ™ steel exhibits:

•    Higher tensile strength
•    Increased wear resistance
•    Greatly improved impact properties
•    Increased elongation
•    Lower distortion
•    No cracking during quenching
•    Increased fatigue strength (in high load, low cycle fatigue application)

Typical applications of Carbo-Austempered™  Steel include:

•    Transmission shafts
•    Output Shafts
•    Pump Shafts
•    Differential Pinions
•    Spline Drives
•    Parking Pawls.