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SAE-AISI M3 Class 2 Steel vs. R30605 Cobalt

SAE-AISI M3 class 2 steel belongs to the iron alloys classification, while R30605 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 R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 770 to 2210
1130 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Melting Completion (Liquidus), °C 1620
1410
Melting Onset (Solidus), °C 1570
1330
Specific Heat Capacity, J/kg-K 440
410
Thermal Conductivity, W/m-K 26
9.6
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.3
9.6
Embodied Carbon, kg CO2/kg material 12
9.8
Embodied Energy, MJ/kg 180
140
Embodied Water, L/kg 110
450

Common Calculations

Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 23
21
Strength to Weight: Axial, points 26 to 74
33 to 55
Strength to Weight: Bending, points 22 to 45
25 to 36
Thermal Diffusivity, mm2/s 7.2
2.5
Thermal Shock Resistance, points 24 to 69
31 to 52

Alloy Composition

Carbon (C), % 1.2 to 1.3
0.050 to 0.15
Chromium (Cr), % 3.8 to 4.5
19 to 21
Cobalt (Co), % 0
46.4 to 57
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
1.0 to 2.0
Molybdenum (Mo), % 4.8 to 6.5
0
Nickel (Ni), % 0 to 0.3
9.0 to 11
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.45
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 5.0 to 6.8
14 to 16
Vanadium (V), % 2.8 to 3.8
0

Comparable Variants