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R31539 Cobalt vs. S20161 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while S20161 stainless steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is S20161 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 22
46
Fatigue Strength, MPa 310 to 480
360
Poisson's Ratio 0.29
0.28
Reduction in Area, % 13 to 23
45
Rockwell C Hardness 25 to 35
22
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
980
Tensile Strength: Yield (Proof), MPa 590 to 940
390

Thermal Properties

Latent Heat of Fusion, J/g 320
330
Melting Completion (Liquidus), °C 1360
1380
Melting Onset (Solidus), °C 1290
1330
Specific Heat Capacity, J/kg-K 450
490
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.9

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.5
Embodied Carbon, kg CO2/kg material 8.2
2.7
Embodied Energy, MJ/kg 110
39
Embodied Water, L/kg 530
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
360
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
390
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 33 to 44
36
Strength to Weight: Bending, points 27 to 32
29
Thermal Diffusivity, mm2/s 3.5
4.0
Thermal Shock Resistance, points 24 to 32
22

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.15
Chromium (Cr), % 26 to 30
15 to 18
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
65.6 to 73.9
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
4.0 to 6.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
4.0 to 6.0
Nitrogen (N), % 0 to 0.25
0.080 to 0.2
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
3.0 to 4.0
Sulfur (S), % 0
0 to 0.040