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R30012 Cobalt vs. EN 1.4611 Stainless Steel

R30012 cobalt belongs to the cobalt alloys classification, while EN 1.4611 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 (8, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is EN 1.4611 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
21
Fatigue Strength, MPa 320
180
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 830
530
Tensile Strength: Yield (Proof), MPa 650
280

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1280
1390
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 15
21
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
3.0

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.7
Embodied Carbon, kg CO2/kg material 8.3
2.5
Embodied Energy, MJ/kg 120
36
Embodied Water, L/kg 480
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
91
Resilience: Unit (Modulus of Resilience), kJ/m3 960
190
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
19
Strength to Weight: Bending, points 22
19
Thermal Diffusivity, mm2/s 3.8
5.7
Thermal Shock Resistance, points 23
18

Alloy Composition

Aluminum (Al), % 0
0 to 0.050
Carbon (C), % 1.4 to 2.0
0 to 0.030
Chromium (Cr), % 27 to 32
19 to 22
Cobalt (Co), % 47.5 to 64.1
0
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 0 to 3.0
73.3 to 80.8
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0 to 1.0
0 to 0.5
Nickel (Ni), % 0 to 3.0
0 to 0.5
Phosphorus (P), % 0
0 to 0.050
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.050
Titanium (Ti), % 0
0.2 to 1.0
Tungsten (W), % 7.5 to 9.5
0