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R31539 Cobalt vs. AISI 440B Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while AISI 440B stainless steel belongs to the iron alloys. There are 26 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 R31539 cobalt and the bottom bar is AISI 440B stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
3.0 to 18
Fatigue Strength, MPa 310 to 480
260 to 850
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
740 to 1930
Tensile Strength: Yield (Proof), MPa 590 to 940
430 to 1860

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1360
1480
Melting Onset (Solidus), °C 1290
1370
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
23
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.9

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.2
2.2
Embodied Energy, MJ/kg 110
31
Embodied Water, L/kg 530
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
57 to 110
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
27 to 70
Strength to Weight: Bending, points 27 to 32
24 to 45
Thermal Diffusivity, mm2/s 3.5
6.1
Thermal Shock Resistance, points 24 to 32
27 to 70

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.75 to 1.0
Chromium (Cr), % 26 to 30
16 to 18
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
78.2 to 83.3
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.75
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.015

Comparable Variants