Cobalt-Chrome Alloy F75 vs Haynes 188
Cobalt-Chrome Alloy · grade comparison
Cobalt-Chrome Alloy F75 and Haynes 188 are both cobalt-chrome alloy grades. F75 is the stronger of the two: yield strength 510 MPa (74 ksi) against 464 MPa (67.3 ksi) for Haynes 188, about 10% more. In exchange, Haynes 188 is the more ductile: elongation 53% versus 10% for F75, and F75 is harder (300 HB vs 215 HB). F75 is lighter (8.3 g/cm³ vs 8.98 g/cm³ for Haynes 188) and Haynes 188 is stiffer (232 GPa vs 220 GPa). On the shop floor, Haynes 188 welds better (very good vs poor) and F75 sits in a lower cost tier (premium, $$$) than Haynes 188 (high, $$$$).
F75Choose it when strength drives the design, or when weight is the constraint.
Haynes 188Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
F75 vs Haynes 188: 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
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
Same in both: Poisson's Ratio 0.3
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)
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
Brazeability / Solderability
Polishability
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)
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 | F75 | Haynes 188 |
|---|---|---|
| CNC machining | Yes | — |
| 3D printing | Yes | — |
| Default condition | As Cast | — |
| Relative cost | $$$ Premium | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
| Electropolishing | Yes | — |
| Passivation (Stainless Steel) | Yes | — |
F75 vs Haynes 188 — frequently asked
Is F75 stronger than Haynes 188?
Yes. F75 has a typical yield strength of 510 MPa (74 ksi) against 464 MPa (67.3 ksi) for Haynes 188 — about 10% more. Tensile strength is 720 MPa (104 ksi) vs 960 MPa (139 ksi).
Which is cheaper, F75 or Haynes 188?
F75 is the lower-cost material: it sits in the premium tier ($$$) while Haynes 188 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 Haynes 188?
Haynes 188. Its weldability rates very good (75/100) against poor (25/100) for F75.
Ready to make it?
Upload a CAD file and FabDigit prices the part in F75 and Haynes 188 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.