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R30021 Cobalt vs. EN 1.4805 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while EN 1.4805 stainless steel belongs to the iron alloys. They have a modest 26% 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 (9, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is EN 1.4805 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
9.0
Fatigue Strength, MPa 250
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 700
490
Tensile Strength: Yield (Proof), MPa 500
250

Thermal Properties

Latent Heat of Fusion, J/g 330
310
Melting Completion (Liquidus), °C 1350
1390
Melting Onset (Solidus), °C 1190
1350
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
14
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.0
4.7
Embodied Energy, MJ/kg 110
66
Embodied Water, L/kg 520
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
37
Resilience: Unit (Modulus of Resilience), kJ/m3 570
150
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
17
Strength to Weight: Bending, points 21
18
Thermal Diffusivity, mm2/s 3.8
3.7
Thermal Shock Resistance, points 21
11

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.2 to 0.5
Chromium (Cr), % 26 to 29
19 to 23
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
44.9 to 56.8
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 4.5 to 6.0
0 to 0.5
Nickel (Ni), % 2.0 to 3.0
23 to 27
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
1.0 to 2.0
Sulfur (S), % 0
0 to 0.030