Nickel Alloy Nitinol-O vs Nitinol-SA
Nickel Alloy · Nitinol temper comparison
Nitinol-O and Nitinol-SA are two conditions of the same nickel alloy grade, Nitinol: O (annealed) versus SA (straight Annealed wire). The chemistry is identical, so every difference below comes from the condition. Nitinol-SA is the stronger of the two: yield strength 450 MPa (65.3 ksi) against 400 MPa (58 ksi) for Nitinol-O, about 13% more; tensile strength follows at 1,250 MPa (181 ksi) vs 950 MPa (138 ksi). In exchange, Nitinol-O is the more ductile: elongation 30% versus 12% for Nitinol-SA, and Nitinol-SA is harder (30 HRC vs 22 HRC). Nitinol-SA conducts electricity better (2.1 % IACS vs 1.7 % IACS).
Nitinol-OChoose it when the part is bent, formed or impact-loaded.
Nitinol-SAChoose it when strength drives the design.
Nitinol-O vs Nitinol-SA: 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
Compressive Strength
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 75 GPa10.9 Msi · Shear Modulus 24 GPa3.5 Msi · Poisson's Ratio 0.33 · Fatigue Strength (Endurance Limit) 350 MPa50.8 ksi · Fracture Toughness (K_IC) 40 MPa·√m36.4 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 6.45 g/cm³0.23 lb/in³ · Melting Point (Solidus) 1,300°C2,372 °F · Liquidus Temperature 1,310°C2,390 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 18 W/m·K10.4 BTU/hr·ft·°F · Specific Heat Capacity 500 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11 µm/m·K6.1 µin/in·°F · Max Service Temperature (continuous) 300°C572 °F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Weldability
Formability (cold)
Same in both: Machinability 12 / 100 · Machinability Rating (AISI 1212 = 100 %) 10% · Castability 15 / 100 · Brazeability / Solderability 20 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 400 MJ/kg171,969 BTU/lb · Embodied Carbon (primary production) 26 kg CO₂/kg · Embodied Water 900 L/kg108 gal/lb · Typical Recycled Content 5%
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.
Nitinol-O vs Nitinol-SA — frequently asked
Is Nitinol-SA stronger than Nitinol-O?
Yes. Nitinol-SA has a typical yield strength of 450 MPa (65.3 ksi) against 400 MPa (58 ksi) for Nitinol-O — about 13% more. Tensile strength is 1,250 MPa (181 ksi) vs 950 MPa (138 ksi).
Which condition does FabDigit quote by default, O or SA?
O is the default Nitinol 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, Nitinol-O or Nitinol-SA?
Nitinol-SA. Its weldability rates fair (40/100) against fair (35/100) for Nitinol-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Nitinol-O and Nitinol-SA 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.