Nickel Alloy Alloy 825-CD vs Alloy 825-STA
Nickel Alloy · Alloy 825 temper comparison
Alloy 825-CD and Alloy 825-STA are two conditions of the same nickel alloy grade, Alloy 825: CD (cold drawn) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Alloy 825-CD is the stronger of the two: yield strength 560 MPa (81.2 ksi) against 300 MPa (43.5 ksi) for Alloy 825-STA, about 87% more; tensile strength follows at 790 MPa (115 ksi) vs 670 MPa (97.2 ksi). In exchange, Alloy 825-STA is the more ductile: elongation 44% versus 25% for Alloy 825-CD, and Alloy 825-CD is harder (220 HB vs 158 HB). Alloy 825-STA runs hotter in service (540°C vs 480°C continuous).
Alloy 825-CDChoose it when strength drives the design.
Alloy 825-STAChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Alloy 825-CD vs Alloy 825-STA: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all nickel 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 nickel 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 B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 196 GPa28.4 Msi · Shear Modulus 76 GPa11 Msi · Bulk Modulus 163 GPa23.6 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Same in both: Density 8.14 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,370°C2,498 °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 11.1 W/m·K6.4 BTU/hr·ft·°F · Specific Heat Capacity 440 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 14 µm/m·K7.8 µin/in·°F · Latent Heat of Fusion 295 J/g127 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.5 % IACS · Electrical Resistivity 1.13×10⁻⁶ Ω·m44.5 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V
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 85 / 100 · Castability 30 / 100 · Brazeability / Solderability 60 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 115 MJ/kg49,441 BTU/lb · Embodied Carbon (primary production) 8.5 kg CO₂/kg · Embodied Water 300 L/kg35.9 gal/lb · Typical Recycled Content 45%
Strength versus weight
Yield strength against density for every nickel alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Alloy 825-CD vs Alloy 825-STA — frequently asked
Is Alloy 825-CD stronger than Alloy 825-STA?
Yes. Alloy 825-CD has a typical yield strength of 560 MPa (81.2 ksi) against 300 MPa (43.5 ksi) for Alloy 825-STA — about 87% more. Tensile strength is 790 MPa (115 ksi) vs 670 MPa (97.2 ksi).
Which condition does FabDigit quote by default, CD or STA?
ANN is the default Alloy 825 condition in the FabDigit quote flow (neither CD nor STA). 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 is easier to machine, Alloy 825-CD or Alloy 825-STA?
Alloy 825-CD, by a small margin. Both rate poor for machinability — 30/100 against 25/100 for Alloy 825-STA.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Alloy 825-CD and Alloy 825-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.