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R31538 Cobalt vs. S41041 Stainless Steel

R31538 cobalt belongs to the cobalt alloys classification, while S41041 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 R31538 cobalt and the bottom bar is S41041 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
17
Fatigue Strength, MPa 310 to 480
350
Poisson's Ratio 0.29
0.28
Reduction in Area, % 13 to 22
56
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
910
Tensile Strength: Yield (Proof), MPa 580 to 930
580

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1290
1410
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
29
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
2.2
Embodied Energy, MJ/kg 110
31
Embodied Water, L/kg 530
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
140
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
860
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
32
Strength to Weight: Bending, points 27 to 32
27
Thermal Diffusivity, mm2/s 3.5
7.8
Thermal Shock Resistance, points 25 to 33
33

Alloy Composition

Aluminum (Al), % 0
0 to 0.050
Carbon (C), % 0.15 to 0.35
0.13 to 0.18
Chromium (Cr), % 26 to 30
11.5 to 13
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
84.5 to 87.8
Manganese (Mn), % 0 to 1.0
0.4 to 0.6
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.2
Nickel (Ni), % 0 to 1.0
0 to 0.5
Niobium (Nb), % 0
0.15 to 0.45
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0
0 to 0.030