Tribaloy™ T-400/T-400C Alloys

Nominal Composition (Mass %) and Physical Properties

  Co Cr Mo C Si Others Hardness Density Melting Range
T-400 Base 8.5 28 <0.08 2.5 Ni, Fe
51-58 HRC 8.90 g/cm3
0.325 lb/in3
T-400C Base 14 27 <0.08 2.6 Ni, Fe 48-56 HRC 8.86 g/cm3
0.320 lb/in3

Tribaloy T-400 and T-400C

Tribaloy cobalt-based alloys consist of a hard, intermetallic (Laves) phase dispersed in a softer matrix of eutectic or solid solution. They exhibit outstanding resistance to wear and galling, high corrosion resistance and are particularly suitable where lubrication is a problem. Wear resistance of Tribaloy alloys is highly dependent on the volume percentage of the Laves phase.

Tribaloy T-400 combines excellent mechanical wear resistance with good corrosion resistance. T-400 contains hard intermetallic phases of Mo and Si which give the alloy excellent wear properties over a wide temperature range. T-400 exhibits outstanding resistance to galling. T-400C offers improved oxidation corrosion and high-temperature wear resistance over T-400 as well as improved thermal shock resistance.

T-400 and T-400C are known for their use in automotive turbocharger applications. Other areas of application are in situations where:

  • Metal-to-metal wear exists
  • Surfaces cannot be lubricated (e.g. high temperatures)
  • Lubrication starvation exists
  • Fluid lubricant is of low viscosity
  • Both wear and corrosion are factors
Typical Microstructure Tribaloy T-400 (500x)
Tribaloy T-400 Powder
UNS R30400 Castings, Powder Metallurgy, Powder and Rod


Tribaloy T-400/T-400C Alloy Data Sheet

Check out our Tribaloy T-400/T-400C Alloy data sheet for additional information.

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