Cobalt-Chrome Alloy Elgiloy vs MP159
Cobalt-Chrome Alloy · grade comparison
Cobalt-Chrome Alloy Elgiloy and MP159 are both cobalt-chrome alloy grades. Elgiloy is the stronger of the two: yield strength 2,000 MPa (290 ksi) against 1,830 MPa (265 ksi) for MP159, about 9% more; tensile strength follows at 2,200 MPa (319 ksi) vs 1,965 MPa (285 ksi). In exchange, MP159 is the more ductile: elongation 10% versus 3% for Elgiloy, and Elgiloy is harder (58 HRC vs 52 HRC). MP159 runs hotter in service (593°C vs 400°C continuous).
ElgiloyChoose it when strength drives the design.
MP159Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Elgiloy vs MP159: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Rockwell C
Hardness, Vickers
Compressive Strength
Fracture Toughness (K_IC)
Same in both: Poisson's Ratio 0.3
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)
Min Service Temperature
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Electrical Conductivity 1.7 % IACS
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.2 V
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 %) 8%
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 20%
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 9
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 | Elgiloy | MP159 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Elgiloy vs MP159 — frequently asked
Is Elgiloy stronger than MP159?
Yes. Elgiloy has a typical yield strength of 2,000 MPa (290 ksi) against 1,830 MPa (265 ksi) for MP159 — about 9% more. Tensile strength is 2,200 MPa (319 ksi) vs 1,965 MPa (285 ksi).
Which is cheaper, Elgiloy or MP159?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which welds better, Elgiloy or MP159?
Elgiloy. Its weldability rates poor (25/100) against poor (20/100) for MP159.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Elgiloy and MP159 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.