Ferrium® C61

UNS #K93061

Ferrium® C61 is a premium quality carburizing steel that offers high core strength, high fatigue strength, high temperature resistance, and high hardenability versus AISI 9310, X53 (AMS 6308), EN36, and other standard carburizable alloys. Its benefits include light weighting of components and increasing power density in applications in aerospace, energy, racing/off-road/mission-critical vehicles, and other industries where weight savings, compactness, high temperature and surface fatigue resistance are valued. The alloy has achieved carburized case hardness of 60-62 HRC but provides ultra-high core properties for demanding applications. The high tempering temperature (900°F/482°F) offers a 400-600°F (204-315°C) increase in thermal stability relative to conventional gear steels. Well suited to low-pressure carburization at high temperature to reduce manufacturing time and expense while providing reliable carburization profiles, Ferrium® C61 does not require a separate hardening/quenching process.

Type Analysis

  • Carbon (Nominal) 0.15
  • Nickel (Nominal) 9.5
  • Chromium (Nominal) 3.5
  • Cobalt (Nominal) 18
  • Molybdenum (Nominal) 1.1
  • Iron (Nominal) Balance
  • Vanadium (Nominal) 0.08


Power transmission shafts, transmission gears

Applicable Specifications

  • AMS 6517
  • D210-13802-1






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