Reviewed · 2026-08-13
Cobalt Alloys
Cobalt alloys serve corrosion, wear and high-temperature duties through distinct bulk, deposited, cast and powder-metallurgy routes; chemistry alone cannot define finished-product acceptance.
Classification basis
Product route, strengthening mechanism, service temperature, wear/corrosion mode and acceptance method
Four procurement groups separate Co-Cr bulk alloys, wear-resistant deposits and castings, cobalt-base superalloys and cobalt-bonded cemented carbides.
A familiar grade name never replaces the governing product specification and certified documentation.01
Explore subcategories
Cobalt-Chromium Alloys
Covers bulk Co-Cr and Co-Cr-Mo products; excludes hardfacing deposits and WC-Co cemented carbides.
→CobaltWear-Resistant Cobalt Alloys
Covers Stellite-type bulk and deposited wear alloys; excludes cobalt-base creep alloys and cobalt-bonded hardmetals.
→CobaltCobalt-Base Superalloys
Covers load-bearing high-temperature cobalt alloys; excludes nickel-base superalloys and wear overlays whose primary function is surface life.
→CobaltCobalt-Bonded Hardmetals
Covers cemented-carbide composites; excludes bulk cobalt alloys and loose cobalt-containing powders sold without consolidation acceptance.
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Representative grades and systems
| Grade / system | Use as a selection entry point |
|---|---|
| Co-Cr-Mo F75 | Separate bulk alloy from deposited coating. |
| Alloy 6 hardfacing | Match carbide and matrix to wear mode. |
| Haynes 188 | Specify route-specific defects and tests. |
| WC-10Co | Separate bulk alloy from deposited coating. |
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Property framework
Hot strength and oxidation resistance
Galling and wear resistance
Corrosion and route-dependent toughness
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Common product forms
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Applications
- Valve trim and hardfacing
- Turbine combustor hardware
- Medical and cutting-tool components
- Separate bulk alloy from deposited coating.
- Match carbide and matrix to wear mode.
- Specify route-specific defects and tests.
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Standards and designation systems
Applicable ASTM/ISO product specification
Qualified welding or casting procedure
Powder-metallurgy grade and test standard
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Procurement checklist
- State chemistry and manufacturing route.
- Define condition, dilution/porosity or microstructure.
- Specify mechanical, NDT and traceability acceptance.
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