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R31539 Cobalt vs. EN 1.4646 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while EN 1.4646 stainless steel belongs to the iron alloys. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is EN 1.4646 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
34
Fatigue Strength, MPa 310 to 480
340
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
750
Tensile Strength: Yield (Proof), MPa 590 to 940
430

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1390
Melting Onset (Solidus), °C 1290
1340
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 13
17

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.2
2.8
Embodied Energy, MJ/kg 110
41
Embodied Water, L/kg 530
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
220
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
460
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
27
Strength to Weight: Bending, points 27 to 32
24
Thermal Shock Resistance, points 24 to 32
16

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.020 to 0.1
Chromium (Cr), % 26 to 30
17 to 19
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
1.5 to 3.0
Iron (Fe), % 0 to 0.75
59 to 67.3
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
10.5 to 12.5
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.5
Nickel (Ni), % 0 to 1.0
3.5 to 4.5
Nitrogen (N), % 0 to 0.25
0.2 to 0.3
Phosphorus (P), % 0
0 to 0.050
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.015