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R30021 Cobalt vs. Grade 704C Zirconium

R30021 cobalt belongs to the cobalt alloys classification, while grade 704C zirconium belongs to the otherwise unclassified metals. 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 R30021 cobalt and the bottom bar is grade 704C zirconium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
97
Elongation at Break, % 9.0
11
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 86
36
Tensile Strength: Ultimate (UTS), MPa 700
470
Tensile Strength: Yield (Proof), MPa 500
310

Thermal Properties

Latent Heat of Fusion, J/g 330
240
Specific Heat Capacity, J/kg-K 450
270
Thermal Conductivity, W/m-K 15
21
Thermal Expansion, µm/m-K 11
5.9

Otherwise Unclassified Properties

Density, g/cm3 8.4
6.7
Embodied Water, L/kg 520
460

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
48
Resilience: Unit (Modulus of Resilience), kJ/m3 570
490
Stiffness to Weight: Axial, points 15
8.1
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 23
20
Strength to Weight: Bending, points 21
20
Thermal Diffusivity, mm2/s 3.8
12
Thermal Shock Resistance, points 21
58

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.1
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Hafnium (Hf), % 0
0 to 4.5
Hydrogen (H), % 0
0 to 0.0050
Iron (Fe), % 0 to 3.0
0 to 0.3
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.3
Phosphorus (P), % 0
0 to 0.010
Silicon (Si), % 0 to 1.5
0
Tin (Sn), % 0
1.0 to 2.0
Zirconium (Zr), % 0
92.9 to 99