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Grade 366 Molybdenum vs. SAE-AISI P21 Steel

Grade 366 molybdenum belongs to the otherwise unclassified metals classification, while SAE-AISI P21 steel belongs to the iron alloys. There are 16 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is grade 366 molybdenum and the bottom bar is SAE-AISI P21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 300
190
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 120
73
Tensile Strength: Ultimate (UTS), MPa 580
1130

Thermal Properties

Latent Heat of Fusion, J/g 310
250
Specific Heat Capacity, J/kg-K 210
470
Thermal Expansion, µm/m-K 7.6
12

Otherwise Unclassified Properties

Density, g/cm3 12
7.9
Embodied Carbon, kg CO2/kg material 27
2.3
Embodied Energy, MJ/kg 340
32
Embodied Water, L/kg 300
62

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 18
24
Strength to Weight: Axial, points 13
40
Strength to Weight: Bending, points 13
31
Thermal Shock Resistance, points 18
37

Alloy Composition

Carbon (C), % 0 to 0.030
0.18 to 0.22
Chromium (Cr), % 0
0 to 0.5
Cobalt (Co), % 0
1.1 to 1.3
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.010
92.1 to 94.2
Manganese (Mn), % 0
0.35 to 0.72
Molybdenum (Mo), % 66.9 to 73
0
Nickel (Ni), % 0 to 0.0020
3.9 to 4.3
Nitrogen (N), % 0 to 0.0020
0
Oxygen (O), % 0 to 0.0025
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.010
0.2 to 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 27 to 33
0
Vanadium (V), % 0
0.15 to 0.25