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SAE-AISI M3 Class 2 Steel vs. R30012 Cobalt

SAE-AISI M3 class 2 steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M3 class 2 steel and the bottom bar is R30012 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 77
86
Tensile Strength: Ultimate (UTS), MPa 770 to 2210
830

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1620
1470
Melting Onset (Solidus), °C 1570
1280
Specific Heat Capacity, J/kg-K 440
440
Thermal Conductivity, W/m-K 26
15
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.3
8.8
Embodied Carbon, kg CO2/kg material 12
8.3
Embodied Energy, MJ/kg 180
120
Embodied Water, L/kg 110
480

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 26 to 74
26
Strength to Weight: Bending, points 22 to 45
22
Thermal Diffusivity, mm2/s 7.2
3.8
Thermal Shock Resistance, points 24 to 69
23

Alloy Composition

Carbon (C), % 1.2 to 1.3
1.4 to 2.0
Chromium (Cr), % 3.8 to 4.5
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.8 to 82.3
0 to 3.0
Manganese (Mn), % 0.15 to 0.4
0
Molybdenum (Mo), % 4.8 to 6.5
0 to 1.0
Nickel (Ni), % 0 to 0.3
0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.45
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 5.0 to 6.8
7.5 to 9.5
Vanadium (V), % 2.8 to 3.8
0