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EN 1.4945 Stainless Steel vs. R05200 Tantalum

EN 1.4945 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 (13, 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 1.4945 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, % 19 to 34
1.1 to 28
Poisson's Ratio 0.28
0.34
Shear Modulus, GPa 77
69
Tensile Strength: Ultimate (UTS), MPa 640 to 740
210 to 540
Tensile Strength: Yield (Proof), MPa 290 to 550
140 to 390

Thermal Properties

Latent Heat of Fusion, J/g 290
140
Specific Heat Capacity, J/kg-K 470
140
Thermal Conductivity, W/m-K 14
59
Thermal Expansion, µm/m-K 17
6.5

Otherwise Unclassified Properties

Density, g/cm3 8.1
17
Embodied Water, L/kg 150
650

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 180
5.5 to 53
Resilience: Unit (Modulus of Resilience), kJ/m3 210 to 760
50 to 420
Stiffness to Weight: Axial, points 14
6.2
Stiffness to Weight: Bending, points 24
11
Strength to Weight: Axial, points 22 to 25
3.6 to 9.0
Strength to Weight: Bending, points 20 to 22
4.8 to 8.8
Thermal Diffusivity, mm2/s 3.7
25
Thermal Shock Resistance, points 14 to 16
13 to 32

Alloy Composition

Carbon (C), % 0.040 to 0.1
0 to 0.010
Chromium (Cr), % 15.5 to 17.5
0
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 57.9 to 65.7
0 to 0.010
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 0
0 to 0.020
Nickel (Ni), % 15.5 to 17.5
0 to 0.010
Niobium (Nb), % 0.4 to 1.2
0 to 0.1
Nitrogen (N), % 0.060 to 0.14
0 to 0.010
Oxygen (O), % 0
0 to 0.015
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.3 to 0.6
0 to 0.0050
Sulfur (S), % 0 to 0.015
0
Tantalum (Ta), % 0
99.8 to 100
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 2.5 to 3.5
0 to 0.050