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R30012 Cobalt vs. EN 1.4658 Stainless Steel

R30012 cobalt belongs to the cobalt alloys classification, while EN 1.4658 stainless steel belongs to the iron alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is EN 1.4658 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 1.0
28
Fatigue Strength, MPa 320
530
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 86
81
Tensile Strength: Ultimate (UTS), MPa 830
900
Tensile Strength: Yield (Proof), MPa 650
730

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1280
1400
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.8
Embodied Carbon, kg CO2/kg material 8.3
4.5
Embodied Energy, MJ/kg 120
61
Embodied Water, L/kg 480
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
240
Resilience: Unit (Modulus of Resilience), kJ/m3 960
1280
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
32
Strength to Weight: Bending, points 22
26
Thermal Diffusivity, mm2/s 3.8
4.3
Thermal Shock Resistance, points 23
24

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.030
Chromium (Cr), % 27 to 32
26 to 29
Cobalt (Co), % 47.5 to 64.1
0.5 to 2.0
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 0 to 3.0
50.9 to 63.7
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0 to 1.0
4.0 to 5.0
Nickel (Ni), % 0 to 3.0
5.5 to 9.5
Nitrogen (N), % 0
0.3 to 0.5
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0
0 to 0.010
Tungsten (W), % 7.5 to 9.5
0