Nickel Alloy Nimonic 115 CAST+A vs Nimonic 115-ST
Nickel Alloy · Nimonic 115 temper comparison
Nimonic 115 CAST+A and Nimonic 115-ST are two conditions of the same nickel alloy grade, Nimonic 115: CAST+A (investment cast, solution treated and aged) versus ST (solution annealed). The chemistry is identical, so every difference below comes from the condition. Nimonic 115 CAST+A is the stronger of the two: yield strength 800 MPa (116 ksi) against 600 MPa (87 ksi) for Nimonic 115-ST, about 33% more; tensile strength follows at 1,030 MPa (149 ksi) vs 960 MPa (139 ksi). In exchange, Nimonic 115-ST is the more ductile: elongation 33% versus 9% for Nimonic 115 CAST+A, and Nimonic 115 CAST+A is harder (37 HRC vs 25 HRC). Nimonic 115 CAST+A runs hotter in service (1,000°C vs 900°C continuous).
Nimonic 115 CAST+AChoose it when strength drives the design, or when the part sees heat.
Nimonic 115-STChoose it when the part is bent, formed or impact-loaded.
Nimonic 115 CAST+A vs Nimonic 115-ST: 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.
Nimonic 115 CAST+ANimonic 115-ST
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Charpy V-Notch Impact (RT)
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 224 GPa32.5 Msi · Shear Modulus 85 GPa12.3 Msi · Bulk Modulus 190 GPa27.6 Msi · Poisson's Ratio 0.31 · Shear Strength 760 MPa110 ksi · Fatigue Strength (Endurance Limit) 480 MPa69.6 ksi · Fracture Toughness (K_IC) 90 MPa·√m81.9 ksi·√in · Hardness, Brinell 360 HB
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,290°C2,354 °F · Liquidus Temperature 1,360°C2,480 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 10.7 W/m·K6.2 BTU/hr·ft·°F · Specific Heat Capacity 448 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.2 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 290 J/g125 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.2 % IACS · Electrical Resistivity 1.39×10⁻⁶ Ω·m54.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.15 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 %)
Weldability
Formability (cold)
Same in both: Castability 60 / 100 · Brazeability / Solderability 45 / 100 · Polishability 70 / 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 220 L/kg26.4 gal/lb · Typical Recycled Content 30%
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.
Nimonic 115 CAST+A vs Nimonic 115-ST — frequently asked
Is Nimonic 115 CAST+A stronger than Nimonic 115-ST?
Yes. Nimonic 115 CAST+A has a typical yield strength of 800 MPa (116 ksi) against 600 MPa (87 ksi) for Nimonic 115-ST — about 33% more. Tensile strength is 1,030 MPa (149 ksi) vs 960 MPa (139 ksi).
Which condition does FabDigit quote by default, CAST+A or ST?
ST+A is the default Nimonic 115 condition in the FabDigit quote flow (neither CAST+A nor ST). 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, Nimonic 115 CAST+A or Nimonic 115-ST?
Nimonic 115-ST. Its machinability rates poor (16/100) against not recommended (9/100) for Nimonic 115 CAST+A; for welding the order is Nimonic 115-ST first (poor, 15/100) then Nimonic 115 CAST+A (not recommended, 8/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Nimonic 115 CAST+A and Nimonic 115-ST 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.