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R31539 Cobalt vs. EN 1.4477 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while EN 1.4477 stainless steel belongs to the iron alloys. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is EN 1.4477 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 13 to 22
22 to 23
Fatigue Strength, MPa 310 to 480
420 to 490
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
81
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
880 to 930
Tensile Strength: Yield (Proof), MPa 590 to 940
620 to 730

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1430
Melting Onset (Solidus), °C 1290
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.2
3.7
Embodied Energy, MJ/kg 110
52
Embodied Water, L/kg 530
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
180 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
940 to 1290
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
31 to 33
Strength to Weight: Bending, points 27 to 32
26 to 27
Thermal Diffusivity, mm2/s 3.5
3.5
Thermal Shock Resistance, points 24 to 32
23 to 25

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.030
Chromium (Cr), % 26 to 30
28 to 30
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
0 to 0.8
Iron (Fe), % 0 to 0.75
56.6 to 63.6
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0.8 to 1.5
Molybdenum (Mo), % 5.0 to 7.0
1.5 to 2.6
Nickel (Ni), % 0 to 1.0
5.8 to 7.5
Nitrogen (N), % 0 to 0.25
0.3 to 0.4
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0
0 to 0.015

Comparable Variants