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SAE-AISI M44 Steel vs. R31537 Cobalt

SAE-AISI M44 steel belongs to the iron alloys classification, while R31537 cobalt belongs to the cobalt alloys. They have a modest 23% 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 R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
87
Tensile Strength: Ultimate (UTS), MPa 870 to 2290
1000 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1590
1360
Melting Onset (Solidus), °C 1540
1290
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 14
13
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 9.9
8.1
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 170
530

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28 to 75
33 to 44
Strength to Weight: Bending, points 24 to 46
26 to 32
Thermal Diffusivity, mm2/s 3.7
3.4
Thermal Shock Resistance, points 27 to 70
24 to 32

Alloy Composition

Carbon (C), % 1.1 to 1.2
0 to 0.14
Chromium (Cr), % 4.0 to 4.8
26 to 30
Cobalt (Co), % 11 to 12.3
58.9 to 69
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 65.3 to 70.6
0 to 0.75
Manganese (Mn), % 0.2 to 0.4
0 to 1.0
Molybdenum (Mo), % 6.0 to 7.0
5.0 to 7.0
Nickel (Ni), % 0 to 0.3
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.3 to 0.55
0 to 1.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 5.0 to 5.8
0
Vanadium (V), % 1.9 to 2.2
0

Comparable Variants