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R30003 Cobalt vs. SAE-AISI M2 Steel

R30003 cobalt belongs to the cobalt alloys classification, while SAE-AISI M2 steel belongs to the iron alloys. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 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 R30003 cobalt and the bottom bar is SAE-AISI M2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 83
77
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
760 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 310
260
Melting Completion (Liquidus), °C 1400
1610
Melting Onset (Solidus), °C 1440
1570
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 13
22
Thermal Expansion, µm/m-K 13
10

Otherwise Unclassified Properties

Base Metal Price, % relative 95
24
Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 8.0
8.8
Embodied Energy, MJ/kg 110
130
Embodied Water, L/kg 400
98

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 32 to 57
25 to 71
Strength to Weight: Bending, points 26 to 38
22 to 44
Thermal Diffusivity, mm2/s 3.3
5.9
Thermal Shock Resistance, points 26 to 45
27 to 76

Alloy Composition

Boron (B), % 0 to 0.1
0
Carbon (C), % 0 to 0.15
0.78 to 1.1
Chromium (Cr), % 19 to 21
3.8 to 4.5
Cobalt (Co), % 39 to 41
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 10 to 20.5
78.5 to 83.4
Manganese (Mn), % 1.5 to 2.5
0.15 to 0.4
Molybdenum (Mo), % 6.0 to 8.0
4.5 to 5.5
Nickel (Ni), % 14 to 16
0 to 0.3
Phosphorus (P), % 0 to 0.015
0 to 0.030
Silicon (Si), % 0 to 1.2
0.2 to 0.45
Sulfur (S), % 0 to 0.015
0 to 0.030
Tungsten (W), % 0
5.5 to 6.8
Vanadium (V), % 0
1.8 to 2.2

Comparable Variants