Cobalt-Chrome Alloy G-CoCr28 vs L605
Cobalt-Chrome Alloy · grade comparison
Cobalt-Chrome Alloy G-CoCr28 and L605 are both cobalt-chrome alloy grades. G-CoCr28 is the stronger of the two: yield strength 500 MPa (72.5 ksi) against 460 MPa (66.7 ksi) for L605, about 9% more. In exchange, L605 is the more ductile: elongation 58% versus 9% for G-CoCr28, and G-CoCr28 is harder (320 HB vs 240 HB). G-CoCr28 is lighter (8.3 g/cm³ vs 9.13 g/cm³ for L605) and L605 runs hotter in service (980°C vs 600°C continuous). On the shop floor, L605 welds better (very good vs poor) and G-CoCr28 sits in a lower cost tier (high, $$$$) than L605 (specialty, $$$$$).
G-CoCr28Choose it when strength drives the design, or when weight is the constraint.
L605Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
G-CoCr28 vs L605: 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
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
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)
Min Service Temperature
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 %) 12%
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 500 L/kg59.9 gal/lb
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 3
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 | G-CoCr28 | L605 |
|---|---|---|
| CNC machining | — | Yes |
| Default condition | — | Solution Annealed |
| Relative cost | $$$$ High | $$$$$ Specialty |
| Min. machined wall | — | — |
| Best machined surface | — | — |
| Electropolishing | — | Yes |
| Passivation (Stainless Steel) | — | Yes |
G-CoCr28 vs L605 — frequently asked
Is G-CoCr28 stronger than L605?
Yes. G-CoCr28 has a typical yield strength of 500 MPa (72.5 ksi) against 460 MPa (66.7 ksi) for L605 — about 9% more. Tensile strength is 720 MPa (104 ksi) vs 1,010 MPa (146 ksi).
Which is cheaper, G-CoCr28 or L605?
G-CoCr28 is the lower-cost material: it sits in the high tier ($$$$) while L605 is specialty ($$$$$). 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, G-CoCr28 or L605?
L605. Its weldability rates very good (72/100) against poor (30/100) for G-CoCr28.
Ready to make it?
Upload a CAD file and FabDigit prices the part in G-CoCr28 and L605 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.