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R31539 Cobalt vs. AISI 205 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while AISI 205 stainless steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is AISI 205 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
11 to 51
Fatigue Strength, MPa 310 to 480
410 to 640
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
800 to 1430
Tensile Strength: Yield (Proof), MPa 590 to 940
450 to 1100

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1360
1380
Melting Onset (Solidus), °C 1290
1340
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 13
18

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.6
Embodied Carbon, kg CO2/kg material 8.2
2.6
Embodied Energy, MJ/kg 110
37
Embodied Water, L/kg 530
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
150 to 430
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
510 to 3060
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 33 to 44
29 to 52
Strength to Weight: Bending, points 27 to 32
25 to 37
Thermal Shock Resistance, points 24 to 32
16 to 29

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.12 to 0.25
Chromium (Cr), % 26 to 30
16.5 to 18.5
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
62.6 to 68.1
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
14 to 15.5
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
1.0 to 1.7
Nitrogen (N), % 0 to 0.25
0.32 to 0.4
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030

Comparable Variants