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SAE-AISI M41 Steel vs. R31538 Cobalt

SAE-AISI M41 steel belongs to the iron alloys classification, while R31538 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 M41 steel and the bottom bar is R31538 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 77
86
Tensile Strength: Ultimate (UTS), MPa 800 to 2290
1020 to 1360

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1600
1360
Melting Onset (Solidus), °C 1550
1290
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 22
13
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 9.1
8.1
Embodied Energy, MJ/kg 140
110
Embodied Water, L/kg 120
530

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 76
34 to 45
Strength to Weight: Bending, points 23 to 46
27 to 32
Thermal Diffusivity, mm2/s 6.0
3.5
Thermal Shock Resistance, points 25 to 71
25 to 33

Alloy Composition

Carbon (C), % 1.1 to 1.2
0.15 to 0.35
Chromium (Cr), % 3.8 to 4.5
26 to 30
Cobalt (Co), % 4.8 to 5.8
58.7 to 68.9
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 73.4 to 78.9
0 to 0.75
Manganese (Mn), % 0.2 to 0.6
0 to 1.0
Molybdenum (Mo), % 3.3 to 4.3
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), % 0.15 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 6.3 to 7.0
0
Vanadium (V), % 1.8 to 2.3
0

Comparable Variants