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R31539 Cobalt vs. S44700 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while S44700 stainless steel belongs to the iron alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is S44700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 13 to 22
23
Fatigue Strength, MPa 310 to 480
300
Poisson's Ratio 0.29
0.27
Reduction in Area, % 13 to 23
45
Rockwell C Hardness 25 to 35
17
Shear Modulus, GPa 86
82
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
600
Tensile Strength: Yield (Proof), MPa 590 to 940
450

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1410
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.6
Embodied Energy, MJ/kg 110
49
Embodied Water, L/kg 530
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
120
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
480
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
21
Strength to Weight: Bending, points 27 to 32
20
Thermal Shock Resistance, points 24 to 32
19

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.010
Chromium (Cr), % 26 to 30
28 to 30
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 0 to 0.75
64.9 to 68.5
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 0.3
Molybdenum (Mo), % 5.0 to 7.0
3.5 to 4.2
Nickel (Ni), % 0 to 1.0
0 to 0.15
Nitrogen (N), % 0 to 0.25
0 to 0.020
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.2
Sulfur (S), % 0
0 to 0.020