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SAE-AISI M3 Class 2 Steel vs. R30021 Cobalt

SAE-AISI M3 class 2 steel belongs to the iron alloys classification, while R30021 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 R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 770 to 2210
700

Thermal Properties

Latent Heat of Fusion, J/g 260
330
Melting Completion (Liquidus), °C 1620
1350
Melting Onset (Solidus), °C 1570
1190
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 26
15
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 8.3
8.4
Embodied Carbon, kg CO2/kg material 12
8.0
Embodied Energy, MJ/kg 180
110
Embodied Water, L/kg 110
520

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 74
23
Strength to Weight: Bending, points 22 to 45
21
Thermal Diffusivity, mm2/s 7.2
3.8
Thermal Shock Resistance, points 24 to 69
21

Alloy Composition

Carbon (C), % 1.2 to 1.3
0.2 to 0.35
Chromium (Cr), % 3.8 to 4.5
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
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
4.5 to 6.0
Nickel (Ni), % 0 to 0.3
2.0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.45
0 to 1.5
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 5.0 to 6.8
0
Vanadium (V), % 2.8 to 3.8
0