Refractory Metal Ta-40Nb Annealed vs Ta-40Nb-SR
Refractory Metal · Ta-40Nb temper comparison
Ta-40Nb Annealed and Ta-40Nb-SR are two conditions of the same refractory metal grade, Ta-40Nb: Annealed versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. Ta-40Nb-SR is the stronger of the two: yield strength 370 MPa (53.7 ksi) against 220 MPa (31.9 ksi) for Ta-40Nb Annealed, about 68% more; tensile strength follows at 450 MPa (65.3 ksi) vs 330 MPa (47.9 ksi). In exchange, Ta-40Nb Annealed is the more ductile: elongation 27% versus 15% for Ta-40Nb-SR, and Ta-40Nb-SR is harder (165 HB vs 125 HB).
Ta-40Nb AnnealedChoose it when the part is bent, formed or impact-loaded.
Ta-40Nb-SRChoose it when strength drives the design.
Ta-40Nb Annealed vs Ta-40Nb-SR: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all refractory metal 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 refractory metal 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)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 138 GPa20 Msi · Shear Modulus 51 GPa7.4 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.36
Physical
Density and transition temperatures.
Same in both: Density 12.1 g/cm³0.44 lb/in³ · Melting Point (Solidus) 2,650°C4,802 °F · Liquidus Temperature 2,750°C4,982 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 190 J/kg·K0.05 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 6.8 µm/m·K3.8 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 300°C572 °F · Min Service Temperature -253°C-423 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 90 / 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 20 / 100 · Brazeability / Solderability 50 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 2,800 MJ/kg1,203,784 BTU/lb · Embodied Carbon (primary production) 160 kg CO₂/kg · Typical Recycled Content 25%
Strength versus weight
Yield strength against density for every refractory metal grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Ta-40Nb Annealed vs Ta-40Nb-SR — frequently asked
Is Ta-40Nb-SR stronger than Ta-40Nb Annealed?
Yes. Ta-40Nb-SR has a typical yield strength of 370 MPa (53.7 ksi) against 220 MPa (31.9 ksi) for Ta-40Nb Annealed — about 68% more. Tensile strength is 450 MPa (65.3 ksi) vs 330 MPa (47.9 ksi).
Which condition does FabDigit quote by default, Annealed or SR?
Annealed is the default Ta-40Nb 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, Ta-40Nb Annealed or Ta-40Nb-SR?
Ta-40Nb-SR, by a small margin. Both rate poor for machinability — 30/100 against 22/100 for Ta-40Nb Annealed; for welding the order is Ta-40Nb Annealed first (excellent, 85/100) then Ta-40Nb-SR (very good, 80/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ta-40Nb Annealed and Ta-40Nb-SR 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.