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R30816 Cobalt vs. EN 1.4872 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while EN 1.4872 stainless steel belongs to the iron alloys. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 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 R30816 cobalt and the bottom bar is EN 1.4872 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
270
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
28
Fatigue Strength, MPa 250
410
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 81
79
Tensile Strength: Ultimate (UTS), MPa 1020
950
Tensile Strength: Yield (Proof), MPa 460
560

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Melting Completion (Liquidus), °C 1540
1390
Melting Onset (Solidus), °C 1460
1340
Specific Heat Capacity, J/kg-K 420
490
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.6
Embodied Carbon, kg CO2/kg material 20
3.3
Embodied Energy, MJ/kg 320
47
Embodied Water, L/kg 440
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
230
Resilience: Unit (Modulus of Resilience), kJ/m3 510
780
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 22
26
Strength to Weight: Axial, points 31
35
Strength to Weight: Bending, points 25
28
Thermal Diffusivity, mm2/s 3.3
3.9
Thermal Shock Resistance, points 28
21

Alloy Composition

Carbon (C), % 0.32 to 0.42
0.2 to 0.3
Chromium (Cr), % 19 to 21
24 to 26
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
54.2 to 61.6
Manganese (Mn), % 1.0 to 2.0
8.0 to 10
Molybdenum (Mo), % 3.5 to 4.5
0
Nickel (Ni), % 19 to 21
6.0 to 8.0
Niobium (Nb), % 3.5 to 4.5
0
Nitrogen (N), % 0
0.2 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0