Tribaloy™ T-900 Alloy

Nominal Composition (Mass %) and Physical Properties

Co Cr Mo C Si Ni Hardness Density Melting Range
Base 18 23 <0.08 2.7 16 52-57 HRC 8.9 g/cm3
0.312 lb/in3

Tribaloy T-900

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-900 is a cobalt-based Laves phase-containing alloy with improved crack resistance over traditional Tribaloy T-800. Unlike T-800, which requires a preheat of 1000°F or higher, T-900 can be PTA welded with a preheat of 500°F. ASTM G77 adhesive wear test results indicate that Tribaloy T-900 has similar wear resistance to alloy T-800 under low loads and outperforms T-800 under high loads.

Tribaloy T-900 is most effective in applications where corrosion or high-temperature wear resistance is needed. It has been used in a range of applications, including bleed valves on commercial aircraft engines, wedge valves, and seat rings.

Areas of application where Tribaloy alloys are used:

  • Metal-to-metal wear
  • Surfaces that cannot be lubricated (e.g. high temperatures)
  • Lubrication starvation
  • Fluid lubricant is of low viscosity
  • Both wear and corrosion are factors

Available Product Forms

Tribaloy T-900 is available as finished castings, powder metallurgy components, rod and powder.


Tribaloy T-900 Microstructure, PTA at 100x


Tribaloy T-900 Alloy Data Sheet

Check out our Tribaloy T-900 Alloy data sheet for additional information.

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