Cobalt-Chrome Alloy ERCoCr-C-AW vs ERCoCr-C-SR
Cobalt-Chrome Alloy · ERCoCr-C temper comparison
ERCoCr-C-AW and ERCoCr-C-SR are two conditions of the same cobalt-chrome alloy grade, ERCoCr-C: AW (as-welded deposit) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Both yield at about 600 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (as-welded deposit versus stress relieved). ERCoCr-C-SR is the more ductile: elongation 0.8% versus 0.5% for ERCoCr-C-AW.
ERCoCr-C-SRChoose it when the part is bent, formed or impact-loaded.
ERCoCr-C-AW vs ERCoCr-C-SR: 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.
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
Same in both: Elastic (Young's) Modulus 250 GPa36.3 Msi · Shear Modulus 96 GPa13.9 Msi · Bulk Modulus 208 GPa30.2 Msi · Poisson's Ratio 0.3 · Compressive Strength 2,000 MPa290 ksi
Physical
Density and transition temperatures.
Same in both: Density 8.68 g/cm³0.31 lb/in³ · Melting Point (Solidus) 1,265°C2,309 °F · Liquidus Temperature 1,300°C2,372 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 423 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11 µm/m·K6.1 µin/in·°F · Max Service Temperature (continuous) 780°C1,436 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Electrical Conductivity 1.8 % IACS
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 70 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 55 / 100 · Brazeability / Solderability 40 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 145 MJ/kg62,339 BTU/lb · Embodied Carbon (primary production) 12 kg CO₂/kg · Typical Recycled Content 20%
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.
ERCoCr-C-AW vs ERCoCr-C-SR — frequently asked
What is the difference between ERCoCr-C-AW and ERCoCr-C-SR?
ERCoCr-C-AW and ERCoCr-C-SR are two conditions of the same cobalt-chrome alloy grade, ERCoCr-C: AW (as-welded deposit) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Both yield at about 600 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (as-welded deposit versus stress relieved).
Which condition does FabDigit quote by default, AW or SR?
AW is the default ERCoCr-C condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which welds better, ERCoCr-C-AW or ERCoCr-C-SR?
ERCoCr-C-SR. Its weldability rates fair (40/100) against fair (35/100) for ERCoCr-C-AW.
Ready to make it?
Upload a CAD file and FabDigit prices the part in ERCoCr-C-AW and ERCoCr-C-SR 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.