Ductile Cast Iron vs. R05240 Alloy

Ductile cast iron belongs to the iron alloys classification, while R05240 alloy belongs to the otherwise unclassified metals. There are 18 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is ductile cast iron and the bottom bar is R05240 alloy.

Ductile (Nodular, Spheroidal) Cast Iron UNS R05240 Tantalum-Niobium Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		170 to 180
Elastic (Young's, Tensile) Modulus, GPa		150

Elongation at Break, %		2.1 to 20
Elongation at Break, %		25

Poisson's Ratio		0.28 to 0.31
Poisson's Ratio		0.36

Shear Modulus, GPa		64 to 70
Shear Modulus, GPa		57

Tensile Strength: Ultimate (UTS), MPa		460 to 920
Tensile Strength: Ultimate (UTS), MPa		270

Tensile Strength: Yield (Proof), MPa		310 to 670
Tensile Strength: Yield (Proof), MPa		170

Thermal Properties

Latent Heat of Fusion, J/g		270
Latent Heat of Fusion, J/g		210

Specific Heat Capacity, J/kg-K		490
Specific Heat Capacity, J/kg-K		190

Thermal Expansion, µm/m-K		11
Thermal Expansion, µm/m-K		6.8

Otherwise Unclassified Properties

Density, g/cm³		7.1 to 7.5
Density, g/cm³		14

Embodied Water, L/kg		43
Embodied Water, L/kg		460

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		17 to 80
Resilience: Ultimate (Unit Rupture Work), MJ/m³		59

Resilience: Unit (Modulus of Resilience), kJ/m³		280 to 1330
Resilience: Unit (Modulus of Resilience), kJ/m³		90

Stiffness to Weight: Axial, points		12 to 14
Stiffness to Weight: Axial, points		6.3

Stiffness to Weight: Bending, points		24 to 26
Stiffness to Weight: Bending, points		13

Strength to Weight: Axial, points		17 to 35
Strength to Weight: Axial, points		5.4

Strength to Weight: Bending, points		18 to 29
Strength to Weight: Bending, points		6.8

Thermal Shock Resistance, points		17 to 35
Thermal Shock Resistance, points		18

Alloy Composition

Carbon (C), %		3.0 to 3.5
Carbon (C), %		0 to 0.010

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

Iron (Fe), %		93.7 to 95.5
Iron (Fe), %		0 to 0.010

Molybdenum (Mo), %		0
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 0.080
Phosphorus (P), %		0

Silicon (Si), %		1.5 to 2.8
Silicon (Si), %		0 to 0.0050

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