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R31539 Cobalt vs. EN 1.4818 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while EN 1.4818 stainless steel belongs to the iron alloys. They have a modest 21% 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 (8, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is EN 1.4818 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
40
Fatigue Strength, MPa 310 to 480
280
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
700
Tensile Strength: Yield (Proof), MPa 590 to 940
330

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1410
Melting Onset (Solidus), °C 1290
1370
Specific Heat Capacity, J/kg-K 450
490
Thermal Conductivity, W/m-K 13
17
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.4

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.2
3.1
Embodied Energy, MJ/kg 110
44
Embodied Water, L/kg 530
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
230
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
270
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
25
Strength to Weight: Bending, points 27 to 32
23
Thermal Diffusivity, mm2/s 3.5
4.5
Thermal Shock Resistance, points 24 to 32
15

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.040 to 0.080
Cerium (Ce), % 0
0.030 to 0.080
Chromium (Cr), % 26 to 30
18 to 20
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
65.6 to 71.8
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
Nickel (Ni), % 0 to 1.0
9.0 to 11
Nitrogen (N), % 0 to 0.25
0.12 to 0.2
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 1.0
1.0 to 2.0
Sulfur (S), % 0
0 to 0.015