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SAE-AISI M7 Steel vs. R30012 Cobalt

SAE-AISI M7 steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M7 steel and the bottom bar is R30012 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 760 to 2210
830

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1560
1470
Melting Onset (Solidus), °C 1510
1280
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 28
15
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.1
8.8
Embodied Carbon, kg CO2/kg material 8.9
8.3
Embodied Energy, MJ/kg 130
120
Embodied Water, L/kg 100
480

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 26 to 76
26
Strength to Weight: Bending, points 23 to 47
22
Thermal Diffusivity, mm2/s 7.8
3.8
Thermal Shock Resistance, points 24 to 69
23

Alloy Composition

Carbon (C), % 1.0 to 1.1
1.4 to 2.0
Chromium (Cr), % 3.5 to 4.0
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 79.8 to 83.8
0 to 3.0
Manganese (Mn), % 0.15 to 0.4
0
Molybdenum (Mo), % 8.2 to 9.2
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 0.55
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 1.4 to 2.1
7.5 to 9.5
Vanadium (V), % 1.8 to 2.3
0