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R31537 Cobalt vs. S41425 Stainless Steel

R31537 cobalt belongs to the cobalt alloys classification, while S41425 stainless steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R31537 cobalt and the bottom bar is S41425 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 14 to 23
17
Fatigue Strength, MPa 310 to 480
450
Poisson's Ratio 0.29
0.28
Reduction in Area, % 13 to 23
51
Shear Modulus, GPa 87
77
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
920
Tensile Strength: Yield (Proof), MPa 590 to 940
750

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1290
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.7

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.1
2.9
Embodied Energy, MJ/kg 110
40
Embodied Water, L/kg 530
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
150
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 1990
1420
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
33
Strength to Weight: Bending, points 26 to 32
27
Thermal Diffusivity, mm2/s 3.4
4.4
Thermal Shock Resistance, points 24 to 32
33

Alloy Composition

Carbon (C), % 0 to 0.14
0 to 0.050
Chromium (Cr), % 26 to 30
12 to 15
Cobalt (Co), % 58.9 to 69
0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 0 to 0.75
74 to 81.9
Manganese (Mn), % 0 to 1.0
0.5 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
1.5 to 2.0
Nickel (Ni), % 0 to 1.0
4.0 to 7.0
Nitrogen (N), % 0 to 0.25
0.060 to 0.12
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0
0 to 0.0050