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UNS R60706 Zirconium-Niobium Alloy

R60706 alloy is a zirconium alloy. Cited properties are appropriate for the annealed condition. It has a fairly high tensile strength and a moderately low thermal conductivity among zirconium alloys. The graph bars on the material properties cards below compare R60706 alloy to: zirconium 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

Elastic (Young's, Tensile) Modulus

98 GPa 14 x 106 psi

Elongation at Break

16 %

Poisson's Ratio


Shear Modulus

37 GPa 5.3 x 106 psi

Tensile Strength: Ultimate (UTS)

580 MPa 84 x 103 psi

Tensile Strength: Yield (Proof)

390 MPa 56 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Specific Heat Capacity

270 J/kg-K 0.064 BTU/lb-°F

Thermal Conductivity

17 W/m-K 9.9 BTU/h-ft-°F

Thermal Expansion

6.3 µm/m-K

Otherwise Unclassified Properties


6.7 g/cm3 420 lb/ft3

Embodied Water

450 L/kg 54 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

82 MJ/m3

Resilience: Unit (Modulus of Resilience)

760 kJ/m3

Stiffness to Weight: Axial

8.1 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

24 points

Strength to Weight: Bending

23 points

Thermal Diffusivity

9.5 mm2/s

Thermal Shock Resistance

67 points

Alloy Composition

Zirconium (Zr)Zr 91 to 98
Niobium (Nb)Nb 2.0 to 3.0
Hafnium (Hf)Hf 0 to 4.5
Chromium (Cr)Cr 0 to 0.2
Iron (Fe)Fe 0 to 0.2
Oxygen (O)O 0 to 0.16
Carbon (C)C 0 to 0.050
Nitrogen (N)N 0 to 0.025
Hydrogen (H)H 0 to 0.0050

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

Followup Questions

Similar Alloys

Further Reading

ASTM B551: Standard Specification for Zirconium and Zirconium Alloy Strip, Sheet, and Plate

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

Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010