Nickel Alloy Nimonic 105-ST vs Nimonic 105-STA
Nickel Alloy · Nimonic 105 temper comparison
Nimonic 105-ST and Nimonic 105-STA are two conditions of the same nickel alloy grade, Nimonic 105: ST (solution annealed) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Nimonic 105-STA is the stronger of the two: yield strength 810 MPa (117 ksi) against 500 MPa (72.5 ksi) for Nimonic 105-ST, about 62% more; tensile strength follows at 1,150 MPa (167 ksi) vs 860 MPa (125 ksi). In exchange, Nimonic 105-ST is the more ductile: elongation 35% versus 22% for Nimonic 105-STA, and Nimonic 105-STA is harder (333 HB vs 238 HB). Nimonic 105-STA runs hotter in service (950°C vs 800°C continuous). On the shop floor, Nimonic 105-ST welds better (30 vs 15 out of 100).
Nimonic 105-STChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
Nimonic 105-STAChoose it when strength drives the design, or when the part sees heat.
Nimonic 105-ST vs Nimonic 105-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
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 222 GPa32.2 Msi · Shear Modulus 85 GPa12.3 Msi · Bulk Modulus 185 GPa26.8 Msi · Poisson's Ratio 0.3 · Shear Strength 700 MPa102 ksi · Fatigue Strength (Endurance Limit) 450 MPa65.3 ksi · Fracture Toughness (K_IC) 90 MPa·√m81.9 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 8 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,290°C2,354 °F · Liquidus Temperature 1,345°C2,453 °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 419 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.8 µm/m·K6.6 µin/in·°F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 1.3×10⁻⁶ Ω·m51.2 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.15 V · Corrosion Resistance 70 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 8% · Castability 35 / 100 · Brazeability / Solderability 40 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 235 MJ/kg101,032 BTU/lb · Embodied Carbon (primary production) 16 kg CO₂/kg · Embodied Water 320 L/kg38.3 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 105-ST vs Nimonic 105-STA — frequently asked
Is Nimonic 105-STA stronger than Nimonic 105-ST?
Yes. Nimonic 105-STA has a typical yield strength of 810 MPa (117 ksi) against 500 MPa (72.5 ksi) for Nimonic 105-ST — about 62% more. Tensile strength is 1,150 MPa (167 ksi) vs 860 MPa (125 ksi).
Which condition does FabDigit quote by default, ST or STA?
STA is the default Nimonic 105 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 is easier to machine, Nimonic 105-ST or Nimonic 105-STA?
Nimonic 105-ST. Its machinability rates poor (18/100) against not recommended (12/100) for Nimonic 105-STA; for welding the order is Nimonic 105-ST first (poor, 30/100) then Nimonic 105-STA (poor, 15/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Nimonic 105-ST and Nimonic 105-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.