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SAE-AISI M2 Steel vs. R30008 Cobalt

SAE-AISI M2 steel belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 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 R30008 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
950 to 1700

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1610
1400
Melting Onset (Solidus), °C 1570
1330
Specific Heat Capacity, J/kg-K 440
450
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
8.1
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
31 to 56
Strength to Weight: Bending, points 22 to 44
25 to 37
Thermal Shock Resistance, points 27 to 76
25 to 44

Alloy Composition

Boron (B), % 0
0 to 0.0010
Carbon (C), % 0.78 to 1.1
0 to 0.15
Chromium (Cr), % 3.8 to 4.5
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 78.5 to 83.4
7.6 to 20
Manganese (Mn), % 0.15 to 0.4
1.0 to 2.0
Molybdenum (Mo), % 4.5 to 5.5
6.5 to 7.5
Nickel (Ni), % 0 to 0.3
15 to 18
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