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SAE-AISI M2 Steel vs. R30003 Cobalt

SAE-AISI M2 steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt 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 SAE-AISI M2 steel and the bottom bar is R30003 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
83
Tensile Strength: Ultimate (UTS), MPa 760 to 2150
970 to 1720

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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

Comparable Variants