ACI-ASTM CF8C Steel vs. R05240 Alloy

ACI-ASTM CF8C steel 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 ACI-ASTM CF8C steel and the bottom bar is R05240 alloy.

ACI-ASTM CF8C (SCS21, J92710) Cast 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, %		40
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		530
Tensile Strength: Ultimate (UTS), MPa		270

Tensile Strength: Yield (Proof), MPa		260
Tensile Strength: Yield (Proof), MPa		170

Thermal Properties

Latent Heat of Fusion, J/g		300
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		17
Thermal Expansion, µm/m-K		6.8

Otherwise Unclassified Properties

Density, g/cm³		7.8
Density, g/cm³		14

Embodied Water, L/kg		150
Embodied Water, L/kg		460

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		180
Resilience: Ultimate (Unit Rupture Work), MJ/m³		59

Resilience: Unit (Modulus of Resilience), kJ/m³		170
Resilience: Unit (Modulus of Resilience), kJ/m³		90

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		19
Strength to Weight: Axial, points		5.4

Strength to Weight: Bending, points		19
Strength to Weight: Bending, points		6.8

Thermal Shock Resistance, points		11
Thermal Shock Resistance, points		18

Alloy Composition

Carbon (C), %		0 to 0.080
Carbon (C), %		0 to 0.010

Chromium (Cr), %		18 to 21
Chromium (Cr), %		0

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

Iron (Fe), %		61.8 to 73
Iron (Fe), %		0 to 0.010

Manganese (Mn), %		0 to 1.5
Manganese (Mn), %		0

Molybdenum (Mo), %		0 to 0.5
Molybdenum (Mo), %		0 to 0.020

Nickel (Ni), %		9.0 to 12
Nickel (Ni), %		0 to 0.010

Niobium (Nb), %		0 to 1.0
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 2.0
Silicon (Si), %		0 to 0.0050

Sulfur (S), %		0 to 0.040
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