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EN 1.4938 Stainless Steel vs. R05400 Tantalum

EN 1.4938 stainless steel belongs to the iron alloys classification, while R05400 tantalum belongs to the otherwise unclassified metals. 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 EN 1.4938 stainless steel and the bottom bar is R05400 tantalum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 16 to 17
1.1 to 28
Poisson's Ratio 0.28
0.34
Shear Modulus, GPa 76
69
Tensile Strength: Ultimate (UTS), MPa 870 to 1030
210 to 540
Tensile Strength: Yield (Proof), MPa 640 to 870
140 to 390

Thermal Properties

Latent Heat of Fusion, J/g 270
140
Specific Heat Capacity, J/kg-K 470
140
Thermal Conductivity, W/m-K 30
59
Thermal Expansion, µm/m-K 11
6.5

Otherwise Unclassified Properties

Density, g/cm3 7.8
17
Embodied Water, L/kg 110
650

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
5.5 to 53
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1920
50 to 420
Stiffness to Weight: Axial, points 14
6.2
Stiffness to Weight: Bending, points 25
11
Strength to Weight: Axial, points 31 to 37
3.6 to 9.0
Strength to Weight: Bending, points 26 to 29
4.8 to 8.8
Thermal Diffusivity, mm2/s 8.1
25
Thermal Shock Resistance, points 30 to 35
13 to 32

Alloy Composition

Carbon (C), % 0.080 to 0.15
0 to 0.010
Chromium (Cr), % 11 to 12.5
0
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 80.5 to 84.8
0 to 0.010
Manganese (Mn), % 0.4 to 0.9
0
Molybdenum (Mo), % 1.5 to 2.0
0 to 0.020
Nickel (Ni), % 2.0 to 3.0
0 to 0.010
Niobium (Nb), % 0
0 to 0.1
Nitrogen (N), % 0.020 to 0.040
0 to 0.010
Oxygen (O), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0 to 0.0050
Sulfur (S), % 0 to 0.015
0
Tantalum (Ta), % 0
99.7 to 100
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
0 to 0.050
Vanadium (V), % 0.25 to 0.4
0

Comparable Variants