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R30021 Cobalt vs. EN 1.4482 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while EN 1.4482 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 (7, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is EN 1.4482 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
34
Fatigue Strength, MPa 250
420 to 450
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
78
Tensile Strength: Ultimate (UTS), MPa 700
770 to 800
Tensile Strength: Yield (Proof), MPa 500
530 to 570

Thermal Properties

Latent Heat of Fusion, J/g 330
290
Melting Completion (Liquidus), °C 1350
1420
Melting Onset (Solidus), °C 1190
1370
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.0
2.7
Embodied Energy, MJ/kg 110
38
Embodied Water, L/kg 520
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
230 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 570
690 to 820
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
28 to 29
Strength to Weight: Bending, points 21
24 to 25
Thermal Diffusivity, mm2/s 3.8
4.0
Thermal Shock Resistance, points 21
21 to 22

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.030
Chromium (Cr), % 26 to 29
19.5 to 21.5
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 0 to 3.0
66.1 to 74.9
Manganese (Mn), % 0
4.0 to 6.0
Molybdenum (Mo), % 4.5 to 6.0
0.1 to 0.6
Nickel (Ni), % 2.0 to 3.0
1.5 to 3.5
Nitrogen (N), % 0
0.050 to 0.2
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030