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R30012 Cobalt vs. S41425 Stainless Steel

R30012 cobalt belongs to the cobalt alloys classification, while S41425 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 R30012 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, % 1.0
17
Fatigue Strength, MPa 320
450
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 830
920
Tensile Strength: Yield (Proof), MPa 650
750

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1280
1410
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.7

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.9
Embodied Carbon, kg CO2/kg material 8.3
2.9
Embodied Energy, MJ/kg 120
40
Embodied Water, L/kg 480
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
150
Resilience: Unit (Modulus of Resilience), kJ/m3 960
1420
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
33
Strength to Weight: Bending, points 22
27
Thermal Diffusivity, mm2/s 3.8
4.4
Thermal Shock Resistance, points 23
33

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.050
Chromium (Cr), % 27 to 32
12 to 15
Cobalt (Co), % 47.5 to 64.1
0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 0 to 3.0
74 to 81.9
Manganese (Mn), % 0
0.5 to 1.0
Molybdenum (Mo), % 0 to 1.0
1.5 to 2.0
Nickel (Ni), % 0 to 3.0
4.0 to 7.0
Nitrogen (N), % 0
0.060 to 0.12
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0
0 to 0.0050
Tungsten (W), % 7.5 to 9.5
0