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SAE-AISI M3 Class 2 Steel vs. R30001 Cobalt

SAE-AISI M3 class 2 steel belongs to the iron alloys classification, while R30001 cobalt belongs to the cobalt 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 SAE-AISI M3 class 2 steel and the bottom bar is R30001 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
620

Thermal Properties

Latent Heat of Fusion, J/g 260
310
Melting Completion (Liquidus), °C 1620
1530
Melting Onset (Solidus), °C 1570
1260
Specific Heat Capacity, J/kg-K 440
430
Thermal Conductivity, W/m-K 26
15
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 8.3
9.0
Embodied Carbon, kg CO2/kg material 12
8.9
Embodied Energy, MJ/kg 180
130
Embodied Water, L/kg 110
460

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
22
Strength to Weight: Axial, points 26 to 74
19
Strength to Weight: Bending, points 22 to 45
18
Thermal Diffusivity, mm2/s 7.2
3.7
Thermal Shock Resistance, points 24 to 69
19

Alloy Composition

Carbon (C), % 1.2 to 1.3
2.0 to 3.0
Chromium (Cr), % 3.8 to 4.5
28 to 32
Cobalt (Co), % 0
43 to 59
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
11 to 13
Vanadium (V), % 2.8 to 3.8
0