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ASTM A387 Grade 21 Steel vs. Grade 366 Molybdenum

ASTM A387 grade 21 steel belongs to the iron alloys classification, while grade 366 molybdenum belongs to the otherwise unclassified metals. 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 ASTM A387 grade 21 steel and the bottom bar is grade 366 molybdenum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
300
Elongation at Break, % 21
2.2
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 74
120
Tensile Strength: Ultimate (UTS), MPa 500 to 590
580
Tensile Strength: Yield (Proof), MPa 230 to 350
470

Thermal Properties

Latent Heat of Fusion, J/g 260
310
Specific Heat Capacity, J/kg-K 470
210
Thermal Expansion, µm/m-K 13
7.6

Otherwise Unclassified Properties

Density, g/cm3 7.9
12
Embodied Carbon, kg CO2/kg material 1.8
27
Embodied Energy, MJ/kg 23
340
Embodied Water, L/kg 62
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
12
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
370
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
18
Strength to Weight: Axial, points 18 to 21
13
Strength to Weight: Bending, points 18 to 20
13
Thermal Shock Resistance, points 14 to 17
18

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.030
Chromium (Cr), % 2.8 to 3.3
0
Iron (Fe), % 94.4 to 96
0 to 0.010
Manganese (Mn), % 0.3 to 0.6
0
Molybdenum (Mo), % 0.9 to 1.1
66.9 to 73
Nickel (Ni), % 0
0 to 0.0020
Nitrogen (N), % 0
0 to 0.0020
Oxygen (O), % 0
0 to 0.0025
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0 to 0.010
Sulfur (S), % 0 to 0.025
0
Tungsten (W), % 0
27 to 33