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R30012 Cobalt vs. EN 1.4458 Stainless Steel

R30012 cobalt belongs to the cobalt alloys classification, while EN 1.4458 stainless steel belongs to the iron alloys. They have a modest 25% 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 1.4458 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
34
Fatigue Strength, MPa 320
150
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 830
510
Tensile Strength: Yield (Proof), MPa 650
190

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1470
1420
Melting Onset (Solidus), °C 1280
1370
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 12
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
1.9

Otherwise Unclassified Properties

Density, g/cm3 8.8
8.0
Embodied Carbon, kg CO2/kg material 8.3
5.4
Embodied Energy, MJ/kg 120
75
Embodied Water, L/kg 480
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
140
Resilience: Unit (Modulus of Resilience), kJ/m3 960
89
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
17
Strength to Weight: Bending, points 22
18
Thermal Diffusivity, mm2/s 3.8
4.2
Thermal Shock Resistance, points 23
12

Alloy Composition

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 2.0
Iron (Fe), % 0 to 3.0
40.2 to 53
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0 to 1.0
2.0 to 2.5
Nickel (Ni), % 0 to 3.0
26 to 30
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.025
Tungsten (W), % 7.5 to 9.5
0