Cobalt-Chrome Alloy F75 vs F90
Cobalt-Chrome Alloy · grade comparison
Cobalt-Chrome Alloy F75 and F90 are both cobalt-chrome alloy grades, both biomedical cocr. F75 is the stronger of the two: yield strength 510 MPa (74 ksi) against 460 MPa (66.7 ksi) for F90, about 11% more. In exchange, F90 is the more ductile: elongation 55% versus 10% for F75, and F75 is harder (300 HB vs 240 HB). F75 is lighter (8.3 g/cm³ vs 9.13 g/cm³ for F90) and F90 runs hotter in service (980°C vs 600°C continuous). On the shop floor, F90 welds better (very good vs poor) and F75 sits in a lower cost tier (premium, $$$) than F90 (specialty, $$$$$).
F75Choose it when strength drives the design, or when weight is the constraint.
F90Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
F75 vs F90: 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.
Elastic (Young's) Modulus
Shear Modulus
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
Hardness, Rockwell B
Physical
Density and transition temperatures.
Density
Same in both: Melting Point (Solidus) 1,330°C2,426 °F · Liquidus Temperature 1,410°C2,570 °F
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 Resistivity
Same in both: Electrical Conductivity 1.9 % IACS
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
Brazeability / Solderability
Same in both: Polishability 88 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Same in both: Embodied Water 400 L/kg47.9 gal/lb · Typical Recycled Content 25%
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 | F75 | F90 |
|---|---|---|
| 3D printing | Yes | — |
| Sheet metal | — | Yes |
| Default condition | As Cast | Solution Annealed |
| Relative cost | $$$ Premium | $$$$$ Specialty |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both are offered for CNC machining. Both take the same 2 finishes: Electropolishing, Passivation (Stainless Steel).
F75 vs F90 — frequently asked
Is F75 stronger than F90?
Yes. F75 has a typical yield strength of 510 MPa (74 ksi) against 460 MPa (66.7 ksi) for F90 — about 11% more. Tensile strength is 720 MPa (104 ksi) vs 1,000 MPa (145 ksi).
Which is cheaper, F75 or F90?
F75 is the lower-cost material: it sits in the premium tier ($$$) while F90 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, F75 or F90?
F90. Its weldability rates very good (70/100) against poor (25/100) for F75.
Ready to make it?
Upload a CAD file and FabDigit prices the part in F75 and F90 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.