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R05400 Tantalum vs. ACI-ASTM CF8C Steel

R05400 tantalum belongs to the otherwise unclassified metals classification, while ACI-ASTM CF8C steel belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is R05400 tantalum and the bottom bar is ACI-ASTM CF8C steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 1.1 to 28
40
Poisson's Ratio 0.34
0.28
Shear Modulus, GPa 69
77
Tensile Strength: Ultimate (UTS), MPa 210 to 540
530
Tensile Strength: Yield (Proof), MPa 140 to 390
260

Thermal Properties

Latent Heat of Fusion, J/g 140
300
Specific Heat Capacity, J/kg-K 140
480
Thermal Conductivity, W/m-K 59
16
Thermal Expansion, µm/m-K 6.5
17

Otherwise Unclassified Properties

Density, g/cm3 17
7.8
Embodied Water, L/kg 650
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.5 to 53
180
Resilience: Unit (Modulus of Resilience), kJ/m3 50 to 420
170
Stiffness to Weight: Axial, points 6.2
14
Stiffness to Weight: Bending, points 11
25
Strength to Weight: Axial, points 3.6 to 9.0
19
Strength to Weight: Bending, points 4.8 to 8.8
19
Thermal Diffusivity, mm2/s 25
4.3
Thermal Shock Resistance, points 13 to 32
11

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.080
Chromium (Cr), % 0
18 to 21
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.010
61.8 to 73
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0 to 0.020
0 to 0.5
Nickel (Ni), % 0 to 0.010
9.0 to 12
Niobium (Nb), % 0 to 0.1
0 to 1.0
Nitrogen (N), % 0 to 0.010
0
Oxygen (O), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.0050
0 to 2.0
Sulfur (S), % 0
0 to 0.040
Tantalum (Ta), % 99.7 to 100
0
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 0 to 0.050
0