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R30012 Cobalt vs. S40977 Stainless Steel

R30012 cobalt belongs to the cobalt alloys classification, while S40977 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is S40977 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
21
Fatigue Strength, MPa 320
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 830
510
Tensile Strength: Yield (Proof), MPa 650
310

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1280
1400
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 15
25
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
3.3

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.8
Embodied Carbon, kg CO2/kg material 8.3
1.9
Embodied Energy, MJ/kg 120
27
Embodied Water, L/kg 480
97

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
92
Resilience: Unit (Modulus of Resilience), kJ/m3 960
250
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
18
Strength to Weight: Bending, points 22
18
Thermal Diffusivity, mm2/s 3.8
6.7
Thermal Shock Resistance, points 23
18

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.030
Chromium (Cr), % 27 to 32
10.5 to 12.5
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
83.9 to 89.2
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
0.3 to 1.0
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Tungsten (W), % 7.5 to 9.5
0