AISI 440B Stainless Steel vs. R05240 Alloy

AISI 440B stainless steel belongs to the iron alloys classification, while R05240 alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is AISI 440B stainless steel and the bottom bar is R05240 alloy.

AISI 440B (S44003) Stainless Steel UNS R05240 Tantalum-Niobium Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		200
Elastic (Young's, Tensile) Modulus, GPa		150

Elongation at Break, %		3.0 to 18
Elongation at Break, %		25

Poisson's Ratio		0.28
Poisson's Ratio		0.36

Shear Modulus, GPa		77
Shear Modulus, GPa		57

Tensile Strength: Ultimate (UTS), MPa		740 to 1930
Tensile Strength: Ultimate (UTS), MPa		270

Tensile Strength: Yield (Proof), MPa		430 to 1860
Tensile Strength: Yield (Proof), MPa		170

Thermal Properties

Latent Heat of Fusion, J/g		280
Latent Heat of Fusion, J/g		210

Specific Heat Capacity, J/kg-K		480
Specific Heat Capacity, J/kg-K		190

Thermal Expansion, µm/m-K		10
Thermal Expansion, µm/m-K		6.8

Otherwise Unclassified Properties

Density, g/cm³		7.7
Density, g/cm³		14

Embodied Water, L/kg		120
Embodied Water, L/kg		460

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		57 to 110
Resilience: Ultimate (Unit Rupture Work), MJ/m³		59

Stiffness to Weight: Axial, points		14
Stiffness to Weight: Axial, points		6.3

Stiffness to Weight: Bending, points		25
Stiffness to Weight: Bending, points		13

Strength to Weight: Axial, points		27 to 70
Strength to Weight: Axial, points		5.4

Strength to Weight: Bending, points		24 to 45
Strength to Weight: Bending, points		6.8

Thermal Shock Resistance, points		27 to 70
Thermal Shock Resistance, points		18

Alloy Composition

Carbon (C), %		0.75 to 1.0
Carbon (C), %		0 to 0.010

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

Hydrogen (H), %		0
Hydrogen (H), %		0 to 0.0015

Iron (Fe), %		78.2 to 83.3
Iron (Fe), %		0 to 0.010

Manganese (Mn), %		0 to 1.0
Manganese (Mn), %		0

Molybdenum (Mo), %		0 to 0.75
Molybdenum (Mo), %		0 to 0.020

Nickel (Ni), %		0
Nickel (Ni), %		0 to 0.010

Niobium (Nb), %		0
Niobium (Nb), %		35 to 42

Nitrogen (N), %		0
Nitrogen (N), %		0 to 0.010

Oxygen (O), %		0
Oxygen (O), %		0 to 0.020

Phosphorus (P), %		0 to 0.040
Phosphorus (P), %		0

Silicon (Si), %		0 to 1.0
Silicon (Si), %		0 to 0.0050

Sulfur (S), %		0 to 0.015
Sulfur (S), %		0

Tantalum (Ta), %		0
Tantalum (Ta), %		57.9 to 65

Titanium (Ti), %		0
Titanium (Ti), %		0 to 0.010

Tungsten (W), %		0
Tungsten (W), %		0 to 0.050