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R05400 Tantalum vs. S31730 Stainless Steel

R05400 tantalum belongs to the otherwise unclassified metals classification, while S31730 stainless steel belongs to the iron alloys. There are 18 material properties with values for both materials. Properties with values for just one material (14, 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 S31730 stainless 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
540
Tensile Strength: Yield (Proof), MPa 140 to 390
200

Thermal Properties

Latent Heat of Fusion, J/g 140
290
Specific Heat Capacity, J/kg-K 140
470
Thermal Expansion, µm/m-K 6.5
16

Otherwise Unclassified Properties

Density, g/cm3 17
8.0
Embodied Water, L/kg 650
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.5 to 53
170
Resilience: Unit (Modulus of Resilience), kJ/m3 50 to 420
99
Stiffness to Weight: Axial, points 6.2
14
Stiffness to Weight: Bending, points 11
24
Strength to Weight: Axial, points 3.6 to 9.0
19
Strength to Weight: Bending, points 4.8 to 8.8
18
Thermal Shock Resistance, points 13 to 32
12

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.030
Chromium (Cr), % 0
17 to 19
Copper (Cu), % 0
4.0 to 5.0
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.010
52.4 to 61
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0 to 0.020
3.0 to 4.0
Nickel (Ni), % 0 to 0.010
15 to 16.5
Niobium (Nb), % 0 to 0.1
0
Nitrogen (N), % 0 to 0.010
0 to 0.045
Oxygen (O), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.0050
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Tantalum (Ta), % 99.7 to 100
0
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 0 to 0.050
0