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R05200 Tantalum vs. S31655 Stainless Steel

R05200 tantalum belongs to the otherwise unclassified metals classification, while S31655 stainless steel belongs to the iron alloys. There are 20 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 R05200 tantalum and the bottom bar is S31655 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 1.1 to 28
39
Poisson's Ratio 0.34
0.28
Shear Modulus, GPa 69
78
Tensile Strength: Ultimate (UTS), MPa 210 to 540
710
Tensile Strength: Yield (Proof), MPa 140 to 390
350

Thermal Properties

Latent Heat of Fusion, J/g 140
290
Specific Heat Capacity, J/kg-K 140
480
Thermal Conductivity, W/m-K 59
15
Thermal Expansion, µm/m-K 6.5
16

Otherwise Unclassified Properties

Density, g/cm3 17
7.8
Embodied Water, L/kg 650
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.5 to 53
230
Resilience: Unit (Modulus of Resilience), kJ/m3 50 to 420
310
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
25
Strength to Weight: Bending, points 4.8 to 8.8
23
Thermal Diffusivity, mm2/s 25
4.0
Thermal Shock Resistance, points 13 to 32
16

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.030
Chromium (Cr), % 0
19.5 to 21.5
Copper (Cu), % 0
0 to 1.0
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.010
63.2 to 71.9
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0 to 0.020
0.5 to 1.5
Nickel (Ni), % 0 to 0.010
8.0 to 9.5
Niobium (Nb), % 0 to 0.1
0
Nitrogen (N), % 0 to 0.010
0.14 to 0.25
Oxygen (O), % 0 to 0.015
0
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.0050
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Tantalum (Ta), % 99.8 to 100
0
Titanium (Ti), % 0 to 0.010
0
Tungsten (W), % 0 to 0.050
0