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R30605 Cobalt vs. SAE-AISI M4 Steel

R30605 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 (7, in this case) are not shown.

For each property being compared, the top bar is R30605 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 0.29
0.29
Shear Modulus, GPa 81
76
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
770 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 290
260
Melting Completion (Liquidus), °C 1410
1610
Melting Onset (Solidus), °C 1330
1560
Specific Heat Capacity, J/kg-K 410
440
Thermal Conductivity, W/m-K 9.6
25
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 9.6
8.3
Embodied Carbon, kg CO2/kg material 9.8
14
Embodied Energy, MJ/kg 140
210
Embodied Water, L/kg 450
110

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 21
23
Strength to Weight: Axial, points 33 to 55
26 to 72
Strength to Weight: Bending, points 25 to 36
23 to 45
Thermal Diffusivity, mm2/s 2.5
6.9
Thermal Shock Resistance, points 31 to 52
24 to 68

Alloy Composition

Carbon (C), % 0.050 to 0.15
1.3 to 1.4
Chromium (Cr), % 19 to 21
3.8 to 4.8
Cobalt (Co), % 46.4 to 57
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
75.9 to 81.4
Manganese (Mn), % 1.0 to 2.0
0.15 to 0.4
Molybdenum (Mo), % 0
4.3 to 5.5
Nickel (Ni), % 9.0 to 11
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 0.4
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 14 to 16
5.3 to 6.5
Vanadium (V), % 0
3.8 to 4.5

Comparable Variants