Grade 361 Molybdenum vs. S21800 Stainless Steel

Grade 361 molybdenum belongs to the otherwise unclassified metals classification, while S21800 stainless steel belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is grade 361 molybdenum and the bottom bar is S21800 stainless steel.

Grade 361 Molybdenum UNS S21800 (Alloy 218) Stainless 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, %		40

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		740

Tensile Strength: Yield (Proof), MPa		530
Tensile Strength: Yield (Proof), MPa		390

Thermal Properties

Latent Heat of Fusion, J/g		370
Latent Heat of Fusion, J/g		340

Specific Heat Capacity, J/kg-K		250
Specific Heat Capacity, J/kg-K		500

Thermal Expansion, µm/m-K		7.0
Thermal Expansion, µm/m-K		16

Otherwise Unclassified Properties

Density, g/cm³		10
Density, g/cm³		7.5

Embodied Carbon, kg CO₂/kg material		28
Embodied Carbon, kg CO₂/kg material		3.1

Embodied Energy, MJ/kg		330
Embodied Energy, MJ/kg		45

Embodied Water, L/kg		360
Embodied Water, L/kg		150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		37
Resilience: Ultimate (Unit Rupture Work), MJ/m³		250

Resilience: Unit (Modulus of Resilience), kJ/m³		450
Resilience: Unit (Modulus of Resilience), kJ/m³		390

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

Stiffness to Weight: Bending, points		22
Stiffness to Weight: Bending, points		26

Strength to Weight: Axial, points		17
Strength to Weight: Axial, points		27

Strength to Weight: Bending, points		16
Strength to Weight: Bending, points		24

Thermal Shock Resistance, points		21
Thermal Shock Resistance, points		17

Alloy Composition

Carbon (C), %		0 to 0.010
Carbon (C), %		0 to 0.1

Chromium (Cr), %		0
Chromium (Cr), %		16 to 18

Iron (Fe), %		0 to 0.010
Iron (Fe), %		59.1 to 65.4

Manganese (Mn), %		0
Manganese (Mn), %		7.0 to 9.0

Molybdenum (Mo), %		99.9 to 100
Molybdenum (Mo), %		0

Nickel (Ni), %		0 to 0.0050
Nickel (Ni), %		8.0 to 9.0

Nitrogen (N), %		0 to 0.0020
Nitrogen (N), %		0.080 to 0.18

Oxygen (O), %		0 to 0.0070
Oxygen (O), %		0

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.060

Silicon (Si), %		0 to 0.010
Silicon (Si), %		3.5 to 4.5

Sulfur (S), %		0
Sulfur (S), %		0 to 0.030