Cobalt-Chrome Alloy Hiperco 50-CR vs Hiperco 50-SR
Cobalt-Chrome Alloy · Hiperco 50 temper comparison
Hiperco 50-CR and Hiperco 50-SR are two conditions of the same cobalt-chrome alloy grade, Hiperco 50: CR (cold rolled) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Hiperco 50-CR is the stronger of the two: yield strength 830 MPa (120 ksi) against 520 MPa (75.4 ksi) for Hiperco 50-SR, about 60% more; tensile strength follows at 1,000 MPa (145 ksi) vs 760 MPa (110 ksi). In exchange, Hiperco 50-SR is the more ductile: elongation 6% versus 3% for Hiperco 50-CR, and Hiperco 50-CR is harder (285 HB vs 225 HB). Hiperco 50-SR runs hotter in service (500°C vs 400°C continuous) and Hiperco 50-SR conducts heat better (29.5 W/m·K vs 26 W/m·K). On the shop floor, Hiperco 50-SR welds better (fair vs poor).
Hiperco 50-CRChoose it when strength drives the design.
Hiperco 50-SRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Hiperco 50-CR vs Hiperco 50-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)
Elongation at Break
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 8.12 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,440°C2,624 °F · Liquidus Temperature 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 420 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 9.4 µm/m·K5.2 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -70°C-94 °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) -0.55 V · Corrosion Resistance 20 / 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 30 / 100 · Brazeability / Solderability 60 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 85 MJ/kg36,543 BTU/lb · Embodied Carbon (primary production) 6.5 kg CO₂/kg · Embodied Water 260 L/kg31.2 gal/lb · Typical Recycled Content 10%
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.
Hiperco 50-CR vs Hiperco 50-SR — frequently asked
Is Hiperco 50-CR stronger than Hiperco 50-SR?
Yes. Hiperco 50-CR has a typical yield strength of 830 MPa (120 ksi) against 520 MPa (75.4 ksi) for Hiperco 50-SR — about 60% more. Tensile strength is 1,000 MPa (145 ksi) vs 760 MPa (110 ksi).
Which condition does FabDigit quote by default, CR or SR?
Annealed is the default Hiperco 50 condition in the FabDigit quote flow (neither CR nor SR). 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, Hiperco 50-CR or Hiperco 50-SR?
Hiperco 50-SR. Its weldability rates fair (40/100) against poor (30/100) for Hiperco 50-CR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Hiperco 50-CR and Hiperco 50-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.