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SAE-AISI M44 Steel vs. R30012 Cobalt

SAE-AISI M44 steel belongs to the iron alloys classification, while R30012 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 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 M44 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 78
86
Tensile Strength: Ultimate (UTS), MPa 870 to 2290
830

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1590
1470
Melting Onset (Solidus), °C 1540
1280
Specific Heat Capacity, J/kg-K 440
440
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.8
Embodied Carbon, kg CO2/kg material 9.9
8.3
Embodied Energy, MJ/kg 150
120
Embodied Water, L/kg 170
480

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 28 to 75
26
Strength to Weight: Bending, points 24 to 46
22
Thermal Diffusivity, mm2/s 3.7
3.8
Thermal Shock Resistance, points 27 to 70
23

Alloy Composition

Carbon (C), % 1.1 to 1.2
1.4 to 2.0
Chromium (Cr), % 4.0 to 4.8
27 to 32
Cobalt (Co), % 11 to 12.3
47.5 to 64.1
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 65.3 to 70.6
0 to 3.0
Manganese (Mn), % 0.2 to 0.4
0
Molybdenum (Mo), % 6.0 to 7.0
0 to 1.0
Nickel (Ni), % 0 to 0.3
0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.3 to 0.55
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 5.0 to 5.8
7.5 to 9.5
Vanadium (V), % 1.9 to 2.2
0