Refractory Metal Pure Nb As Rolled vs Pure Nb Cold Worked Hard
Refractory Metal · Pure Nb temper comparison
Pure Nb As Rolled and Pure Nb Cold Worked Hard are two conditions of the same refractory metal grade, Pure Nb: As Rolled (hot rolled) versus Cold Worked Hard (cold Worked, Full Hard). The chemistry is identical, so every difference below comes from the condition. Pure Nb Cold Worked Hard is the stronger of the two: yield strength 570 MPa (82.7 ksi) against 400 MPa (58 ksi) for Pure Nb As Rolled, about 43% more; tensile strength follows at 620 MPa (89.9 ksi) vs 450 MPa (65.3 ksi). In exchange, Pure Nb As Rolled is the more ductile: elongation 10% versus 5% for Pure Nb Cold Worked Hard, and Pure Nb Cold Worked Hard is harder (175 HB vs 135 HB). Pure Nb As Rolled runs hotter in service (300°C vs 250°C continuous).
Pure Nb As RolledChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Pure Nb Cold Worked HardChoose it when strength drives the design.
Pure Nb As Rolled vs Pure Nb Cold Worked Hard: 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.
Pure Nb As RolledPure Nb Cold Worked Hard
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, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 103 GPa14.9 Msi · Shear Modulus 37.5 GPa5.4 Msi · Bulk Modulus 170 GPa24.7 Msi · Poisson's Ratio 0.4
Physical
Density and transition temperatures.
Same in both: Density 8.57 g/cm³0.31 lb/in³ · Melting Point (Solidus) 2,477°C4,491 °F · Liquidus Temperature 2,477°C4,491 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 265 J/kg·K0.06 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 7.3 µm/m·K4.1 µin/in·°F · Latent Heat of Fusion 290 J/g125 BTU/lb · Min Service Temperature -269°C-452 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 11.5 % IACS · Electrical Resistivity 1.5×10⁻⁷ Ω·m5.91 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.15 V · 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 60 / 100 · Polishability 85 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 500 MJ/kg214,962 BTU/lb · Embodied Carbon (primary production) 32 kg CO₂/kg · Embodied Water 400 L/kg47.9 gal/lb · 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.
Pure Nb As Rolled vs Pure Nb Cold Worked Hard — frequently asked
Is Pure Nb Cold Worked Hard stronger than Pure Nb As Rolled?
Yes. Pure Nb Cold Worked Hard has a typical yield strength of 570 MPa (82.7 ksi) against 400 MPa (58 ksi) for Pure Nb As Rolled — about 43% more. Tensile strength is 620 MPa (89.9 ksi) vs 450 MPa (65.3 ksi).
Which condition does FabDigit quote by default, As Rolled or Cold Worked Hard?
Vacuum Annealed is the default Pure Nb condition in the FabDigit quote flow (neither As Rolled nor Cold Worked Hard). 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, Pure Nb As Rolled or Pure Nb Cold Worked Hard?
Pure Nb As Rolled. Its weldability rates very good (75/100) against very good (70/100) for Pure Nb Cold Worked Hard.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Pure Nb As Rolled and Pure Nb Cold Worked Hard 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.