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ASTM A387 Grade 21 Steel vs. Grade 360 Molybdenum

ASTM A387 grade 21 steel belongs to the iron alloys classification, while grade 360 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 360 molybdenum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
310
Elongation at Break, % 21
6.3 to 17
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 74
120
Tensile Strength: Ultimate (UTS), MPa 500 to 590
430 to 620
Tensile Strength: Yield (Proof), MPa 230 to 350
270 to 530

Thermal Properties

Latent Heat of Fusion, J/g 260
370
Specific Heat Capacity, J/kg-K 470
250
Thermal Expansion, µm/m-K 13
7.0

Otherwise Unclassified Properties

Density, g/cm3 7.9
10
Embodied Carbon, kg CO2/kg material 1.8
28
Embodied Energy, MJ/kg 23
330
Embodied Water, L/kg 62
360

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
37 to 64
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
120 to 450
Stiffness to Weight: Axial, points 13
17
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 18 to 21
12 to 17
Strength to Weight: Bending, points 18 to 20
12 to 16
Thermal Shock Resistance, points 14 to 17
14 to 21

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
99.9 to 100
Nickel (Ni), % 0
0 to 0.0020
Nitrogen (N), % 0
0 to 0.0020
Oxygen (O), % 0
0 to 0.0015
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0 to 0.010
Sulfur (S), % 0 to 0.025
0