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Grade 366 Molybdenum vs. ASTM A369 Grade FP91

Grade 366 molybdenum belongs to the otherwise unclassified metals classification, while ASTM A369 grade FP91 belongs to the iron alloys. There are 20 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 ASTM A369 grade FP91.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 300
190
Elongation at Break, % 2.2
19
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 120
75
Tensile Strength: Ultimate (UTS), MPa 580
670
Tensile Strength: Yield (Proof), MPa 470
460

Thermal Properties

Latent Heat of Fusion, J/g 310
270
Specific Heat Capacity, J/kg-K 210
470
Thermal Expansion, µm/m-K 7.6
13

Otherwise Unclassified Properties

Density, g/cm3 12
7.8
Embodied Carbon, kg CO2/kg material 27
2.6
Embodied Energy, MJ/kg 340
37
Embodied Water, L/kg 300
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 12
110
Resilience: Unit (Modulus of Resilience), kJ/m3 370
560
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 18
25
Strength to Weight: Axial, points 13
24
Strength to Weight: Bending, points 13
22
Thermal Shock Resistance, points 18
18

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.030
0.080 to 0.12
Chromium (Cr), % 0
8.0 to 9.5
Iron (Fe), % 0 to 0.010
87.3 to 90.3
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 66.9 to 73
0.85 to 1.1
Nickel (Ni), % 0 to 0.0020
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0 to 0.0020
0.030 to 0.070
Oxygen (O), % 0 to 0.0025
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.010
0.2 to 0.5
Sulfur (S), % 0
0 to 0.025
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 27 to 33
0
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010