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R30816 Cobalt vs. EN 1.4422 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while EN 1.4422 stainless steel belongs to the iron alloys. They have a modest 22% 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 (10, in this case) are not shown.

For each property being compared, the top bar is R30816 cobalt and the bottom bar is EN 1.4422 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
17
Fatigue Strength, MPa 250
380
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 81
76
Tensile Strength: Ultimate (UTS), MPa 1020
850
Tensile Strength: Yield (Proof), MPa 460
630

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Melting Completion (Liquidus), °C 1540
1450
Melting Onset (Solidus), °C 1460
1410
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.9
Embodied Carbon, kg CO2/kg material 20
2.7
Embodied Energy, MJ/kg 320
37
Embodied Water, L/kg 440
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
130
Resilience: Unit (Modulus of Resilience), kJ/m3 510
1000
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
30
Strength to Weight: Bending, points 25
25
Thermal Diffusivity, mm2/s 3.3
4.3
Thermal Shock Resistance, points 28
31

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.020
Chromium (Cr), % 19 to 21
11 to 13
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
0.2 to 0.8
Iron (Fe), % 0 to 5.0
76.8 to 83.5
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 3.5 to 4.5
1.3 to 1.8
Nickel (Ni), % 19 to 21
4.0 to 5.0
Niobium (Nb), % 3.5 to 4.5
0
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.0030
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0