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R31539 Cobalt vs. AISI 415 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while AISI 415 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 AISI 415 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
17
Fatigue Strength, MPa 310 to 480
430
Poisson's Ratio 0.29
0.28
Reduction in Area, % 13 to 23
50
Rockwell C Hardness 25 to 35
28
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
900
Tensile Strength: Yield (Proof), MPa 590 to 940
700

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
24
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
3.1

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
2.5
Embodied Energy, MJ/kg 110
35
Embodied Water, L/kg 530
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
140
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
1250
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
32
Strength to Weight: Bending, points 27 to 32
26
Thermal Diffusivity, mm2/s 3.5
6.4
Thermal Shock Resistance, points 24 to 32
33

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.050
Chromium (Cr), % 26 to 30
11.5 to 14
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
77.8 to 84
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0.5 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0.5 to 1.0
Nickel (Ni), % 0 to 1.0
3.5 to 5.5
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.6
Sulfur (S), % 0
0 to 0.030