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AISI 431 Stainless Steel vs. R05200 Tantalum

AISI 431 stainless steel belongs to the iron alloys classification, while R05200 tantalum belongs to the otherwise unclassified metals. 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 AISI 431 stainless steel and the bottom bar is R05200 tantalum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 15 to 17
1.1 to 28
Poisson's Ratio 0.28
0.34
Shear Modulus, GPa 77
69
Tensile Strength: Ultimate (UTS), MPa 890 to 1380
210 to 540
Tensile Strength: Yield (Proof), MPa 710 to 1040
140 to 390

Thermal Properties

Latent Heat of Fusion, J/g 280
140
Specific Heat Capacity, J/kg-K 480
140
Thermal Conductivity, W/m-K 26
59
Thermal Expansion, µm/m-K 12
6.5

Otherwise Unclassified Properties

Density, g/cm3 7.7
17
Embodied Water, L/kg 120
650

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 180
5.5 to 53
Resilience: Unit (Modulus of Resilience), kJ/m3 1270 to 2770
50 to 420
Stiffness to Weight: Axial, points 14
6.2
Stiffness to Weight: Bending, points 25
11
Strength to Weight: Axial, points 32 to 50
3.6 to 9.0
Strength to Weight: Bending, points 27 to 36
4.8 to 8.8
Thermal Diffusivity, mm2/s 7.0
25
Thermal Shock Resistance, points 28 to 43
13 to 32

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.010
Chromium (Cr), % 15 to 17
0
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 78.2 to 83.8
0 to 0.010
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0
0 to 0.020
Nickel (Ni), % 1.3 to 2.5
0 to 0.010
Niobium (Nb), % 0
0 to 0.1
Nitrogen (N), % 0
0 to 0.010
Oxygen (O), % 0
0 to 0.015
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.0050
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 0
99.8 to 100
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
0 to 0.050