Cobalt-Chrome Alloy ERCoCr-A-AW vs ERCoCr-A-SR
Cobalt-Chrome Alloy · ERCoCr-A temper comparison
ERCoCr-A-AW and ERCoCr-A-SR are two conditions of the same cobalt-chrome alloy grade, ERCoCr-A: AW (as-welded deposit) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Both yield at about 620 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). For most parts the choice follows the drawing's specified condition; ask for the one your standard calls out.
ERCoCr-A-AW vs ERCoCr-A-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.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Compressive Strength
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: Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 175 GPa25.4 Msi · Poisson's Ratio 0.3 · Elongation at Break 1%
Physical
Density and transition temperatures.
Same in both: Density 8.44 g/cm³0.3 lb/in³ · Melting Point (Solidus) 1,285°C2,345 °F · Liquidus Temperature 1,395°C2,543 °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) 12 µm/m·K6.7 µin/in·°F · Max Service Temperature (continuous) 800°C1,472 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V · Corrosion Resistance 78 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 55 / 100 · Castability 70 / 100 · Brazeability / Solderability 55 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 155 MJ/kg66,638 BTU/lb · Embodied Carbon (primary production) 11.5 kg CO₂/kg · Embodied Water 350 L/kg41.9 gal/lb · Typical Recycled Content 25%
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-A-AW vs ERCoCr-A-SR — frequently asked
What is the difference between ERCoCr-A-AW and ERCoCr-A-SR?
ERCoCr-A-AW and ERCoCr-A-SR are two conditions of the same cobalt-chrome alloy grade, ERCoCr-A: AW (as-welded deposit) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Both yield at about 620 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-A 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.
Ready to make it?
Upload a CAD file and FabDigit prices the part in ERCoCr-A-AW and ERCoCr-A-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.