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Grade 705C Zirconium vs. R30003 Cobalt

Grade 705C zirconium belongs to the otherwise unclassified metals classification, while R30003 cobalt belongs to the cobalt alloys. There are 19 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 705C zirconium and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 98
210
Elongation at Break, % 13
10 to 73
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 36
83
Tensile Strength: Ultimate (UTS), MPa 540
970 to 1720
Tensile Strength: Yield (Proof), MPa 390
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Specific Heat Capacity, J/kg-K 270
450
Thermal Conductivity, W/m-K 18
13
Thermal Expansion, µm/m-K 5.7
13

Otherwise Unclassified Properties

Density, g/cm3 6.7
8.4
Embodied Water, L/kg 450
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 790
600 to 2790
Stiffness to Weight: Axial, points 8.1
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 22
32 to 57
Strength to Weight: Bending, points 22
26 to 38
Thermal Diffusivity, mm2/s 9.9
3.3
Thermal Shock Resistance, points 69
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0 to 0.1
0 to 0.15
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
39 to 41
Hafnium (Hf), % 0 to 4.5
0
Hydrogen (H), % 0 to 0.0050
0
Iron (Fe), % 0 to 0.3
10 to 20.5
Manganese (Mn), % 0
1.5 to 2.5
Molybdenum (Mo), % 0
6.0 to 8.0
Nickel (Ni), % 0
14 to 16
Niobium (Nb), % 2.0 to 3.0
0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.010
0 to 0.015
Silicon (Si), % 0
0 to 1.2
Sulfur (S), % 0
0 to 0.015
Zirconium (Zr), % 91.9 to 98
0