Cobalt-Chrome Alloy F75 vs Phynox
Cobalt-Chrome Alloy · grade comparison
Cobalt-Chrome Alloy F75 and Phynox are both cobalt-chrome alloy grades. Phynox is the stronger of the two: yield strength 1,850 MPa (268 ksi) against 510 MPa (74 ksi) for F75, about 3.6 times as much; tensile strength follows at 2,050 MPa (297 ksi) vs 720 MPa (104 ksi). In exchange, F75 is the more ductile: elongation 10% versus 3% for Phynox, and Phynox is harder (57 HRC vs 30 HRC). F75 runs hotter in service (600°C vs 400°C continuous) and F75 conducts heat better (14 W/m·K vs 12.6 W/m·K). On the shop floor, F75 sits in a lower cost tier (premium, $$$) than Phynox (high, $$$$).
F75Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
PhynoxChoose it when strength drives the design.
F75 vs Phynox: 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
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 220 GPa31.9 Msi · Shear Modulus 85 GPa12.3 Msi
Physical
Density and transition temperatures.
Melting Point (Solidus)
Liquidus Temperature
Same in both: Density 8.3 g/cm³0.3 lb/in³
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
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)
Castability
Polishability
Same in both: Brazeability / Solderability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Same in both: Specific Stiffness (E / density) 26.5 MN·m/kg
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 | F75 | Phynox |
|---|---|---|
| CNC machining | Yes | — |
| 3D printing | Yes | — |
| Default condition | As Cast | — |
| Relative cost | $$$ Premium | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
| Electropolishing | Yes | — |
| Passivation (Stainless Steel) | Yes | — |
F75 vs Phynox — frequently asked
Is Phynox stronger than F75?
Yes. Phynox has a typical yield strength of 1,850 MPa (268 ksi) against 510 MPa (74 ksi) for F75 — about 3.6 times as much. Tensile strength is 2,050 MPa (297 ksi) vs 720 MPa (104 ksi).
Which is cheaper, F75 or Phynox?
F75 is the lower-cost material: it sits in the premium tier ($$$) while Phynox is high ($$$$). 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, F75 or Phynox?
Phynox. Its weldability rates poor (30/100) against poor (25/100) for F75.
Ready to make it?
Upload a CAD file and FabDigit prices the part in F75 and Phynox 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.