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Type 2 (Unalloyed Commercial Grade, R04210) Niobium

Type 2 niobium is a niobium alloy. Cited properties are appropriate for the annealed condition. R04210 is the UNS number for this material. Additionally, the ASTM designation is Niobium Type 2. It has a moderately low density and a moderately low tensile strength among alloys in the same category.

The graph bars on the material properties cards below compare Type 2 niobium to: niobium alloys (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Brinell Hardness

110

Elastic (Young's, Tensile) Modulus

110 GPa 15 x 106 psi

Elongation at Break

29 %

Poisson's Ratio

0.4

Shear Modulus

38 GPa 5.4 x 106 psi

Tensile Strength: Ultimate (UTS)

140 MPa 21 x 103 psi

Tensile Strength: Yield (Proof)

82 MPa 12 x 103 psi

Thermal Properties

Latent Heat of Fusion

320 J/g

Specific Heat Capacity

270 J/kg-K 0.065 BTU/lb-°F

Thermal Conductivity

52 W/m-K 30 BTU/h-ft-°F

Thermal Expansion

7.3 µm/m-K

Otherwise Unclassified Properties

Density

8.6 g/cm3 540 lb/ft3

Embodied Water

160 L/kg 19 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

35 MJ/m3

Resilience: Unit (Modulus of Resilience)

32 kJ/m3

Stiffness to Weight: Axial

6.8 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

4.6 points

Strength to Weight: Bending

7.1 points

Thermal Diffusivity

23 mm2/s

Thermal Shock Resistance

13 points

Alloy Composition

Niobium (Nb)Nb 99.5 to 100
Tantalum (Ta)Ta 0 to 0.3
Tungsten (W)W 0 to 0.050
Titanium (Ti)Ti 0 to 0.030
Oxygen (O)O 0 to 0.025
Molybdenum (Mo)Mo 0 to 0.020
Zirconium (Zr)Zr 0 to 0.020
Hafnium (Hf)Hf 0 to 0.020
Carbon (C)C 0 to 0.010
Iron (Fe)Fe 0 to 0.010
Nitrogen (N)N 0 to 0.010
Silicon (Si)Si 0 to 0.0050
Nickel (Ni)Ni 0 to 0.0050
Hydrogen (H)H 0 to 0.0015

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B392: Standard Specification for Niobium and Niobium Alloy Bar, Rod, and Wire

ASTM B393: Standard Specification for Niobium and Niobium Alloy Strip, Sheet, and Plate

ASTM B394: Standard Specification for Niobium and Niobium Alloy Seamless and Welded Tubes

Extractive Metallurgy of Niobium, C. K. Gupta and A. K. Suri, 1993