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R30816 Cobalt vs. SAE-AISI M4 Steel

R30816 cobalt belongs to the cobalt alloys classification, while SAE-AISI M4 steel belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30816 cobalt and the bottom bar is SAE-AISI M4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 81
76
Tensile Strength: Ultimate (UTS), MPa 1020
770 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 300
260
Melting Completion (Liquidus), °C 1540
1610
Melting Onset (Solidus), °C 1460
1560
Specific Heat Capacity, J/kg-K 420
440
Thermal Conductivity, W/m-K 13
25
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 9.1
8.3
Embodied Carbon, kg CO2/kg material 20
14
Embodied Energy, MJ/kg 320
210
Embodied Water, L/kg 440
110

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
23
Strength to Weight: Axial, points 31
26 to 72
Strength to Weight: Bending, points 25
23 to 45
Thermal Diffusivity, mm2/s 3.3
6.9
Thermal Shock Resistance, points 28
24 to 68

Alloy Composition

Carbon (C), % 0.32 to 0.42
1.3 to 1.4
Chromium (Cr), % 19 to 21
3.8 to 4.8
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 5.0
75.9 to 81.4
Manganese (Mn), % 1.0 to 2.0
0.15 to 0.4
Molybdenum (Mo), % 3.5 to 4.5
4.3 to 5.5
Nickel (Ni), % 19 to 21
0 to 0.3
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
5.3 to 6.5
Vanadium (V), % 0
3.8 to 4.5