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R30012 Cobalt vs. S64512 Stainless Steel

R30012 cobalt belongs to the cobalt alloys classification, while S64512 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is S64512 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
17
Fatigue Strength, MPa 320
540
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 830
1140
Tensile Strength: Yield (Proof), MPa 650
890

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1280
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 15
28
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
4.1

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.8
Embodied Carbon, kg CO2/kg material 8.3
3.3
Embodied Energy, MJ/kg 120
47
Embodied Water, L/kg 480
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
180
Resilience: Unit (Modulus of Resilience), kJ/m3 960
2020
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
40
Strength to Weight: Bending, points 22
31
Thermal Diffusivity, mm2/s 3.8
7.5
Thermal Shock Resistance, points 23
42

Alloy Composition

Carbon (C), % 1.4 to 2.0
0.080 to 0.15
Chromium (Cr), % 27 to 32
11 to 12.5
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
80.6 to 84.7
Manganese (Mn), % 0
0.5 to 0.9
Molybdenum (Mo), % 0 to 1.0
1.5 to 2.0
Nickel (Ni), % 0 to 3.0
2.0 to 3.0
Nitrogen (N), % 0
0.010 to 0.050
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 2.0
0 to 0.35
Sulfur (S), % 0
0 to 0.025
Tungsten (W), % 7.5 to 9.5
0
Vanadium (V), % 0
0.25 to 0.4