Grade 20 Cast Iron vs. R05240 Alloy

Grade 20 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 (14, in this case) are not shown.

For each property being compared, the top bar is grade 20 cast iron and the bottom bar is R05240 alloy.

ASTM Grade 20 or 150 (ISO 150, EN-JL 1020, F11401) Grey Cast Iron UNS R05240 Tantalum-Niobium Alloy

Metric UnitsUS Customary Units

Mechanical Properties

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

Elongation at Break, %		9.6
Elongation at Break, %		25

Poisson's Ratio		0.29
Poisson's Ratio		0.36

Shear Modulus, GPa		69
Shear Modulus, GPa		57

Tensile Strength: Ultimate (UTS), MPa		160
Tensile Strength: Ultimate (UTS), MPa		270

Tensile Strength: Yield (Proof), MPa		98
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		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		7.5
Density, g/cm³		14

Embodied Water, L/kg		44
Embodied Water, L/kg		460

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		13
Resilience: Ultimate (Unit Rupture Work), MJ/m³		59

Resilience: Unit (Modulus of Resilience), kJ/m³		27
Resilience: Unit (Modulus of Resilience), kJ/m³		90

Stiffness to Weight: Axial, points		13
Stiffness to Weight: Axial, points		6.3

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

Strength to Weight: Axial, points		5.8
Strength to Weight: Axial, points		5.4

Strength to Weight: Bending, points		8.7
Strength to Weight: Bending, points		6.8

Thermal Shock Resistance, points		6.0
Thermal Shock Resistance, points		18

Alloy Composition

Carbon (C), %		3.1 to 3.4
Carbon (C), %		0 to 0.010

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

Iron (Fe), %		92.1 to 93.9
Iron (Fe), %		0 to 0.010

Manganese (Mn), %		0.5 to 0.7
Manganese (Mn), %		0

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 0.9
Phosphorus (P), %		0

Silicon (Si), %		2.5 to 2.8
Silicon (Si), %		0 to 0.0050

Sulfur (S), %		0 to 0.15
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