Cobalt-Chrome Alloy ERCoCr-B vs Stellite 6
Cobalt-Chrome Alloy · grade comparison
Cobalt-Chrome Alloy ERCoCr-B and Stellite 6 are both cobalt-chrome alloy grades. ERCoCr-B is the stronger of the two: yield strength 620 MPa (89.9 ksi) against 541 MPa (78.5 ksi) for Stellite 6, about 15% more. ERCoCr-B is harder — 45 HRC against 40 HRC for Stellite 6 — which matters for wear surfaces and threads. On the shop floor, Stellite 6 welds better (good vs fair) and ERCoCr-B sits in a lower cost tier (high, $$$$) than Stellite 6 (specialty, $$$$$).
ERCoCr-BChoose it when strength drives the design, or when surface hardness matters.
Stellite 6Choose it when it will be welded.
ERCoCr-B vs Stellite 6: 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)
Reduction in Area
Compressive Strength
Shear Strength
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Poisson's Ratio 0.3 · Elongation at Break 1% · Fatigue Strength (Endurance Limit) 275 MPa39.9 ksi
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
Min Service Temperature
Same in both: Specific Heat Capacity 423 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.5 µm/m·K6.9 µin/in·°F · Max Service Temperature (continuous) 800°C1,472 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Same in both: Corrosion Resistance 70 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Same in both: Machinability 8 / 100 · Machinability Rating (AISI 1212 = 100 %) 5% · Polishability 85 / 100
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 | ERCoCr-B | Stellite 6 |
|---|---|---|
| Default condition | — | As Cast |
| Relative cost | $$$$ High | $$$$$ Specialty |
| Min. machined wall | — | — |
| Best machined surface | — | — |
ERCoCr-B vs Stellite 6 — frequently asked
Is ERCoCr-B stronger than Stellite 6?
Yes. ERCoCr-B has a typical yield strength of 620 MPa (89.9 ksi) against 541 MPa (78.5 ksi) for Stellite 6 — about 15% more. Tensile strength is 830 MPa (120 ksi) vs 834 MPa (121 ksi).
Which is cheaper, ERCoCr-B or Stellite 6?
ERCoCr-B is the lower-cost material: it sits in the high tier ($$$$) while Stellite 6 is specialty ($$$$$). 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, ERCoCr-B or Stellite 6?
Stellite 6. Its weldability rates good (55/100) against fair (35/100) for ERCoCr-B.
Ready to make it?
Upload a CAD file and FabDigit prices the part in ERCoCr-B and Stellite 6 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.