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Grade 702C Zirconium vs. R30021 Cobalt

Grade 702C zirconium belongs to the otherwise unclassified metals classification, while R30021 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is grade 702C zirconium and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 97
220
Elongation at Break, % 13
9.0
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 36
86
Tensile Strength: Ultimate (UTS), MPa 430
700
Tensile Strength: Yield (Proof), MPa 310
500

Thermal Properties

Latent Heat of Fusion, J/g 250
330
Specific Heat Capacity, J/kg-K 270
450
Thermal Conductivity, W/m-K 22
15
Thermal Expansion, µm/m-K 5.7
11

Otherwise Unclassified Properties

Density, g/cm3 6.7
8.4
Embodied Water, L/kg 450
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 52
57
Resilience: Unit (Modulus of Resilience), kJ/m3 510
570
Stiffness to Weight: Axial, points 8.1
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 18
23
Strength to Weight: Bending, points 19
21
Thermal Diffusivity, mm2/s 12
3.8
Thermal Shock Resistance, points 55
21

Alloy Composition

Carbon (C), % 0 to 0.1
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Hafnium (Hf), % 0 to 4.5
0
Hydrogen (H), % 0 to 0.0050
0
Iron (Fe), % 0 to 0.3
0 to 3.0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0
2.0 to 3.0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.010
0
Silicon (Si), % 0
0 to 1.5
Zirconium (Zr), % 94.8 to 100
0