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SAE-AISI M42 Steel vs. R30006 Cobalt

SAE-AISI M42 steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M42 steel and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 78
85
Tensile Strength: Ultimate (UTS), MPa 810 to 2310
900

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1540
1400
Melting Onset (Solidus), °C 1490
1290
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 20
15
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 8.2
8.6
Embodied Carbon, kg CO2/kg material 7.4
7.8
Embodied Energy, MJ/kg 100
110
Embodied Water, L/kg 140
500

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 28 to 79
29
Strength to Weight: Bending, points 24 to 48
24
Thermal Diffusivity, mm2/s 5.4
3.9
Thermal Shock Resistance, points 25 to 71
26

Alloy Composition

Carbon (C), % 1.1 to 1.2
0.9 to 1.4
Chromium (Cr), % 3.5 to 4.3
27 to 32
Cobalt (Co), % 7.8 to 8.8
48.6 to 68.1
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.3 to 81
0 to 3.0
Manganese (Mn), % 0.15 to 0.4
0
Molybdenum (Mo), % 9.0 to 10
0 to 1.0
Nickel (Ni), % 0 to 0.3
0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.15 to 0.65
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 1.2 to 1.9
4.0 to 6.0
Vanadium (V), % 1.0 to 1.4
0