Cobalt-Chrome Alloy S-816 vs Ultimet
Cobalt-Chrome Alloy · grade comparison
Cobalt-Chrome Alloy S-816 and Ultimet are both cobalt-chrome alloy grades. Both yield at about 480 MPa — strength does not separate them. Ultimet is the more ductile: elongation 39% versus 18% for S-816, and S-816 is harder (300 HB vs 277 HB). Ultimet is stiffer (224 GPa vs 200 GPa) and S-816 conducts heat better (12.5 W/m·K vs 11 W/m·K). On the shop floor, Ultimet welds better (very good vs poor).
UltimetChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
S-816 vs Ultimet: 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
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Poisson's Ratio 0.3 · Tensile Strength (Ultimate) 1,000 MPa145 ksi
Physical
Density and transition temperatures.
Density
Liquidus Temperature
Same in both: Melting Point (Solidus) 1,330°C2,426 °F
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: Latent Heat of Fusion 270 J/g116 BTU/lb · 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
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Same in both: Machinability Rating (AISI 1212 = 100 %) 10%
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 30%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Same in both: Thermal Shock Resistance Index 4
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 | S-816 | Ultimet |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
S-816 vs Ultimet — frequently asked
What is the difference between S-816 and Ultimet?
Cobalt-Chrome Alloy S-816 and Ultimet are both cobalt-chrome alloy grades. Both yield at about 480 MPa — strength does not separate them. Ultimet is the more ductile: elongation 39% versus 18% for S-816, and S-816 is harder (300 HB vs 277 HB).
Which is cheaper, S-816 or Ultimet?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, S-816 or Ultimet?
Ultimet. Its machinability rates poor (18/100) against not recommended (13/100) for S-816; for welding the order is Ultimet first (very good, 75/100) then S-816 (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in S-816 and Ultimet 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.