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SAE-AISI M41 Steel vs. R30816 Cobalt

SAE-AISI M41 steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 21% 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 (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M41 steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 800 to 2290
1020

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1600
1540
Melting Onset (Solidus), °C 1550
1460
Specific Heat Capacity, J/kg-K 440
420
Thermal Conductivity, W/m-K 22
13
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
9.1
Embodied Carbon, kg CO2/kg material 9.1
20
Embodied Energy, MJ/kg 140
320
Embodied Water, L/kg 120
440

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
22
Strength to Weight: Axial, points 26 to 76
31
Strength to Weight: Bending, points 23 to 46
25
Thermal Diffusivity, mm2/s 6.0
3.3
Thermal Shock Resistance, points 25 to 71
28

Alloy Composition

Carbon (C), % 1.1 to 1.2
0.32 to 0.42
Chromium (Cr), % 3.8 to 4.5
19 to 21
Cobalt (Co), % 4.8 to 5.8
40 to 49.8
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 73.4 to 78.9
0 to 5.0
Manganese (Mn), % 0.2 to 0.6
1.0 to 2.0
Molybdenum (Mo), % 3.3 to 4.3
3.5 to 4.5
Nickel (Ni), % 0 to 0.3
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.15 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 6.3 to 7.0
3.5 to 4.5
Vanadium (V), % 1.8 to 2.3
0