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R30816 Cobalt vs. ACI-ASTM CA15 Steel

R30816 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CA15 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30816 cobalt and the bottom bar is ACI-ASTM CA15 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
220
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 23
21
Fatigue Strength, MPa 250
370
Poisson's Ratio 0.3
0.28
Reduction in Area, % 22
34
Shear Modulus, GPa 81
76
Tensile Strength: Ultimate (UTS), MPa 1020
700
Tensile Strength: Yield (Proof), MPa 460
570

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Melting Completion (Liquidus), °C 1540
1440
Melting Onset (Solidus), °C 1460
1500
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 13
25
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.7
Embodied Carbon, kg CO2/kg material 20
2.0
Embodied Energy, MJ/kg 320
28
Embodied Water, L/kg 440
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
140
Resilience: Unit (Modulus of Resilience), kJ/m3 510
820
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
25
Strength to Weight: Bending, points 25
23
Thermal Diffusivity, mm2/s 3.3
6.7
Thermal Shock Resistance, points 28
26

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.15
Chromium (Cr), % 19 to 21
11.5 to 14
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
81.8 to 88.5
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 3.5 to 4.5
0 to 0.5
Nickel (Ni), % 19 to 21
0 to 1.0
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.040
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0