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R31539 Cobalt vs. S64512 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while S64512 stainless steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R31539 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, % 13 to 22
17
Fatigue Strength, MPa 310 to 480
540
Poisson's Ratio 0.29
0.28
Reduction in Area, % 13 to 23
34
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
1140
Tensile Strength: Yield (Proof), MPa 590 to 940
890

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
28
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
3.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
4.1

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.3
Embodied Energy, MJ/kg 110
47
Embodied Water, L/kg 530
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
180
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
2020
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
40
Strength to Weight: Bending, points 27 to 32
31
Thermal Diffusivity, mm2/s 3.5
7.5
Thermal Shock Resistance, points 24 to 32
42

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.080 to 0.15
Chromium (Cr), % 26 to 30
11 to 12.5
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
80.6 to 84.7
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0.5 to 0.9
Molybdenum (Mo), % 5.0 to 7.0
1.5 to 2.0
Nickel (Ni), % 0 to 1.0
2.0 to 3.0
Nitrogen (N), % 0 to 0.25
0.010 to 0.050
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.35
Sulfur (S), % 0
0 to 0.025
Vanadium (V), % 0
0.25 to 0.4