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R30016 Cobalt vs. SAE-AISI M44 Steel

R30016 cobalt belongs to the cobalt alloys classification, while SAE-AISI M44 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 20 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is R30016 cobalt and the bottom bar is SAE-AISI M44 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 85
78
Tensile Strength: Ultimate (UTS), MPa 1010
870 to 2290

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1360
1590
Melting Onset (Solidus), °C 1270
1540
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 15
14
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Density, g/cm3 8.5
8.4
Embodied Carbon, kg CO2/kg material 7.7
9.9
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 500
170

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 33
28 to 75
Strength to Weight: Bending, points 26
24 to 46
Thermal Diffusivity, mm2/s 3.9
3.7
Thermal Shock Resistance, points 24
27 to 70

Alloy Composition

Carbon (C), % 0.9 to 1.4
1.1 to 1.2
Chromium (Cr), % 28 to 32
4.0 to 4.8
Cobalt (Co), % 49.6 to 66.9
11 to 12.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
65.3 to 70.6
Manganese (Mn), % 0.5 to 2.0
0.2 to 0.4
Molybdenum (Mo), % 0 to 1.5
6.0 to 7.0
Nickel (Ni), % 0 to 3.0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0.2 to 2.0
0.3 to 0.55
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 3.5 to 5.5
5.0 to 5.8
Vanadium (V), % 0
1.9 to 2.2