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R31537 Cobalt vs. S40975 Stainless Steel

R31537 cobalt belongs to the cobalt alloys classification, while S40975 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 R31537 cobalt and the bottom bar is S40975 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 14 to 23
22
Fatigue Strength, MPa 310 to 480
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 87
75
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
460
Tensile Strength: Yield (Proof), MPa 590 to 940
310

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
26
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
3.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
2.0
Embodied Energy, MJ/kg 110
28
Embodied Water, L/kg 530
95

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
93
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 1990
250
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
17
Strength to Weight: Bending, points 26 to 32
17
Thermal Diffusivity, mm2/s 3.4
7.0
Thermal Shock Resistance, points 24 to 32
17

Alloy Composition

Carbon (C), % 0 to 0.14
0 to 0.030
Chromium (Cr), % 26 to 30
10.5 to 11.7
Cobalt (Co), % 58.9 to 69
0
Iron (Fe), % 0 to 0.75
84.4 to 89
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0.5 to 1.0
Nitrogen (N), % 0 to 0.25
0 to 0.030
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0
0 to 0.75