Grade 365 Molybdenum vs. ASTM A387 Grade 9 Steel

Grade 365 molybdenum belongs to the otherwise unclassified metals classification, while ASTM A387 grade 9 steel 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 365 molybdenum and the bottom bar is ASTM A387 grade 9 steel.

Grade 365 Molybdenum ASTM A387 Grade 9 (K90941) 9Cr-1Mo Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		310
Elastic (Young's, Tensile) Modulus, GPa		190

Elongation at Break, %		6.3
Elongation at Break, %		20 to 21

Poisson's Ratio		0.31
Poisson's Ratio		0.28

Shear Modulus, GPa		120
Shear Modulus, GPa		75

Tensile Strength: Ultimate (UTS), MPa		620
Tensile Strength: Ultimate (UTS), MPa		500 to 600

Tensile Strength: Yield (Proof), MPa		530
Tensile Strength: Yield (Proof), MPa		230 to 350

Thermal Properties

Latent Heat of Fusion, J/g		370
Latent Heat of Fusion, J/g		270

Specific Heat Capacity, J/kg-K		250
Specific Heat Capacity, J/kg-K		470

Thermal Expansion, µm/m-K		7.0
Thermal Expansion, µm/m-K		13

Otherwise Unclassified Properties

Density, g/cm³		10
Density, g/cm³		7.8

Embodied Carbon, kg CO₂/kg material		28
Embodied Carbon, kg CO₂/kg material		2.1

Embodied Energy, MJ/kg		330
Embodied Energy, MJ/kg		28

Embodied Water, L/kg		360
Embodied Water, L/kg		87

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		37
Resilience: Ultimate (Unit Rupture Work), MJ/m³		83 to 110

Resilience: Unit (Modulus of Resilience), kJ/m³		450
Resilience: Unit (Modulus of Resilience), kJ/m³		140 to 310

Stiffness to Weight: Axial, points		17
Stiffness to Weight: Axial, points		14

Stiffness to Weight: Bending, points		22
Stiffness to Weight: Bending, points		25

Strength to Weight: Axial, points		17
Strength to Weight: Axial, points		18 to 21

Strength to Weight: Bending, points		16
Strength to Weight: Bending, points		18 to 20

Thermal Shock Resistance, points		21
Thermal Shock Resistance, points		14 to 17

Alloy Composition

Carbon (C), %		0 to 0.010
Carbon (C), %		0 to 0.15

Chromium (Cr), %		0
Chromium (Cr), %		8.0 to 10

Iron (Fe), %		0 to 0.010
Iron (Fe), %		87.1 to 90.8

Manganese (Mn), %		0
Manganese (Mn), %		0.3 to 0.6

Molybdenum (Mo), %		99.9 to 100
Molybdenum (Mo), %		0.9 to 1.1

Nickel (Ni), %		0 to 0.0020
Nickel (Ni), %		0

Nitrogen (N), %		0 to 0.0020
Nitrogen (N), %		0

Oxygen (O), %		0 to 0.0015
Oxygen (O), %		0

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.025

Silicon (Si), %		0 to 0.010
Silicon (Si), %		0 to 1.0

Sulfur (S), %		0
Sulfur (S), %		0 to 0.025

Vanadium (V), %		0
Vanadium (V), %		0 to 0.040