Cobalt-Chrome Alloy Phynox vs Stellite 6
Cobalt-Chrome Alloy · grade comparison
Cobalt-Chrome Alloy Phynox and Stellite 6 are both cobalt-chrome alloy grades. Phynox is the stronger of the two: yield strength 1,850 MPa (268 ksi) against 541 MPa (78.5 ksi) for Stellite 6, about 3.4 times as much; tensile strength follows at 2,050 MPa (297 ksi) vs 834 MPa (121 ksi). Phynox is the more ductile: elongation 3% versus 1% for Stellite 6, and Phynox is harder (57 HRC vs 40 HRC). Stellite 6 runs hotter in service (800°C vs 400°C continuous) and Stellite 6 conducts heat better (14.8 W/m·K vs 12.6 W/m·K). On the shop floor, Stellite 6 welds better (good vs poor) and Phynox sits in a lower cost tier (high, $$$$) than Stellite 6 (specialty, $$$$$).
PhynoxChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
Stellite 6Choose it when the part sees heat, or when it will be welded.
Phynox vs Stellite 6: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all cobalt-chrome alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all cobalt-chrome alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Rockwell C
Hardness, Vickers
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Same in both: Elastic (Young's) Modulus 220 GPa31.9 Msi · Shear Modulus 85 GPa12.3 Msi
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Same in both: Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Brazeability / Solderability
Castability
Same in both: Polishability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Embodied Water
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Strength versus weight
Yield strength against density for every cobalt-chrome alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | Phynox | Stellite 6 |
|---|---|---|
| Default condition | — | As Cast |
| Relative cost | $$$$ High | $$$$$ Specialty |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Phynox vs Stellite 6 — frequently asked
Is Phynox stronger than Stellite 6?
Yes. Phynox has a typical yield strength of 1,850 MPa (268 ksi) against 541 MPa (78.5 ksi) for Stellite 6 — about 3.4 times as much. Tensile strength is 2,050 MPa (297 ksi) vs 834 MPa (121 ksi).
Which is cheaper, Phynox or Stellite 6?
Phynox is the lower-cost material: it sits in the high tier ($$$$) while Stellite 6 is specialty ($$$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which welds better, Phynox or Stellite 6?
Stellite 6. Its weldability rates good (55/100) against poor (30/100) for Phynox.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Phynox and Stellite 6 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.