Cobalt-Chrome Alloy Stellite 6B Aged vs Stellite 6B-HR
Cobalt-Chrome Alloy · Stellite 6B temper comparison
Stellite 6B Aged and Stellite 6B-HR are two conditions of the same cobalt-chrome alloy grade, Stellite 6B: Aged (solution treated + precipitation aged) versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. Stellite 6B Aged is the stronger of the two: yield strength 740 MPa (107 ksi) against 630 MPa (91.4 ksi) for Stellite 6B-HR, about 17% more; tensile strength follows at 1,100 MPa (160 ksi) vs 1,000 MPa (145 ksi). In exchange, Stellite 6B-HR is the more ductile: elongation 7% versus 3% for Stellite 6B Aged, and Stellite 6B Aged is harder (425 HB vs 370 HB). On the shop floor, Stellite 6B-HR welds better (25 vs 15 out of 100).
Stellite 6B AgedChoose it when strength drives the design.
Stellite 6B-HRChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
Stellite 6B Aged vs Stellite 6B-HR: 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.
Stellite 6B AgedStellite 6B-HR
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Shear Modulus 88 GPa12.8 Msi · Bulk Modulus 192 GPa27.8 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Same in both: Density 8.38 g/cm³0.3 lb/in³ · Melting Point (Solidus) 1,265°C2,309 °F · Liquidus Temperature 1,354°C2,469 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 421 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.5 µm/m·K6.9 µin/in·°F · Latent Heat of Fusion 275 J/g118 BTU/lb · 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).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V
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: Brazeability / Solderability 55 / 100 · Polishability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 210 MJ/kg90,284 BTU/lb · Embodied Carbon (primary production) 15 kg CO₂/kg · Embodied Water 400 L/kg47.9 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.
Stellite 6B Aged vs Stellite 6B-HR — frequently asked
Is Stellite 6B Aged stronger than Stellite 6B-HR?
Yes. Stellite 6B Aged has a typical yield strength of 740 MPa (107 ksi) against 630 MPa (91.4 ksi) for Stellite 6B-HR — about 17% more. Tensile strength is 1,100 MPa (160 ksi) vs 1,000 MPa (145 ksi).
Which condition does FabDigit quote by default, Aged or HR?
SA is the default Stellite 6B condition in the FabDigit quote flow (neither Aged nor HR). 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, Stellite 6B Aged or Stellite 6B-HR?
Stellite 6B-HR. Its weldability rates poor (25/100) against poor (15/100) for Stellite 6B Aged.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Stellite 6B Aged and Stellite 6B-HR 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.