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R30006 Cobalt vs. EN 1.4581 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while EN 1.4581 stainless steel belongs to the iron alloys. They have a modest 23% 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 R30006 cobalt and the bottom bar is EN 1.4581 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
28
Fatigue Strength, MPa 260
150
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
78
Tensile Strength: Ultimate (UTS), MPa 900
510
Tensile Strength: Yield (Proof), MPa 540
210

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
2.3

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 7.8
4.2
Embodied Energy, MJ/kg 110
59
Embodied Water, L/kg 500
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
120
Resilience: Unit (Modulus of Resilience), kJ/m3 670
110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 29
18
Strength to Weight: Bending, points 24
18
Thermal Diffusivity, mm2/s 3.9
3.9
Thermal Shock Resistance, points 26
12

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.070
Chromium (Cr), % 27 to 32
18 to 20
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
61.4 to 71
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0 to 1.0
2.0 to 2.5
Nickel (Ni), % 0 to 3.0
9.0 to 12
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 4.0 to 6.0
0