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Ferrium 61® - for advanced racing engines

Ferrium 61® is a case-hardened Gear Steel with ultra-high strength core.

Advances in racing engine designs and increased engine power have caused an increase in the failure of dog rings, gears, camshafts, input shafts, racks and pinions.

The design objective for Ferrium® C61 was to develop a high performance secondary-hardening gear and bearing steel with similar surface properties to conventional gear steels such as AISI 9310 and EN36C, but with the added benefits of an ultra high-strength core and excellent fracture toughness. Ferrium C61 is a member of a new class of martensitic secondary-hardening gear and bearing steels that utilize an efficient M2C precipitate strengthening dispersion. Because of the efficiency of this strengthening dispersion, a superior combination of properties can be attained for a given application.

Ferrium C61 was designed to provide carburized surface properties (60-62 HRC) similar to conventional gear steels such as AISI 9310 and EN36C with the added benefit of an ultra high strength core along with excellent fracture toughness.


Ferrium C61 is targeted as a superior alternative to conventional gear materials such as AISI 9310 and EN36C for new smaller, lighter, high temperature resistant component designs, or to upgrade the material in an existing component where a re-design is not feasible.

Ferrium C61 has surface-wear properties similar to those found in current commercial alloys, but provides an ultra high-strength, high-toughness, high-temperature-resistant core. Superior axial and STBF fatigue resistance data has also been demonstrated. Ferrium C61 can be particularly advantageous to reduce the size and weight of integrally geared driveshafts.


Smiths High Performance is a leading stockholder and supplier of high performance engineering materials to the global motorsport sector. We are supply partners in a range of specialist motorsport markets including Formula 1, Formula E, NASCAR, MOTO GP, WEC & WRC.