Cobalt-Chrome Alloy S-816-CD vs S-816-STA
Cobalt-Chrome Alloy · S-816 temper comparison
S-816-CD and S-816-STA are two conditions of the same cobalt-chrome alloy grade, S-816: CD (cold drawn) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. S-816-CD is the stronger of the two: yield strength 900 MPa (131 ksi) against 480 MPa (69.6 ksi) for S-816-STA, about 88% more; tensile strength follows at 1,250 MPa (181 ksi) vs 1,000 MPa (145 ksi). In exchange, S-816-STA is the more ductile: elongation 18% versus 8% for S-816-CD, and S-816-CD is harder (355 HB vs 300 HB). S-816-STA runs hotter in service (870°C vs 700°C continuous).
S-816-CDChoose it when strength drives the design.
S-816-STAChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
S-816-CD vs S-816-STA: 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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 172 GPa24.9 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Same in both: Density 8.68 g/cm³0.31 lb/in³ · Melting Point (Solidus) 1,330°C2,426 °F · Liquidus Temperature 1,400°C2,552 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 12.5 W/m·K7.2 BTU/hr·ft·°F · Specific Heat Capacity 420 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 13.9 µm/m·K7.7 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.9 % IACS · Electrical Resistivity 9.1×10⁻⁷ Ω·m35.8 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.15 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: Castability 68 / 100 · Brazeability / Solderability 55 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 190 MJ/kg81,685 BTU/lb · Embodied Carbon (primary production) 13 kg CO₂/kg · Embodied Water 340 L/kg40.7 gal/lb · Typical Recycled Content 30%
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.
S-816-CD vs S-816-STA — frequently asked
Is S-816-CD stronger than S-816-STA?
Yes. S-816-CD has a typical yield strength of 900 MPa (131 ksi) against 480 MPa (69.6 ksi) for S-816-STA — about 88% more. Tensile strength is 1,250 MPa (181 ksi) vs 1,000 MPa (145 ksi).
Which condition does FabDigit quote by default, CD or STA?
STA is the default S-816 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, S-816-CD or S-816-STA?
S-816-STA. Its weldability rates poor (25/100) against poor (20/100) for S-816-CD.
Ready to make it?
Upload a CAD file and FabDigit prices the part in S-816-CD and S-816-STA 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.