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EN 1.4031 Stainless Steel vs. Type 4 Niobium

EN 1.4031 stainless steel belongs to the iron alloys classification, while Type 4 niobium 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.

For each property being compared, the top bar is EN 1.4031 stainless steel and the bottom bar is Type 4 niobium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Elongation at Break, % 11 to 13
23
Poisson's Ratio 0.28
0.4
Shear Modulus, GPa 76
38
Tensile Strength: Ultimate (UTS), MPa 670 to 900
220
Tensile Strength: Yield (Proof), MPa 390 to 730
140

Thermal Properties

Latent Heat of Fusion, J/g 280
310
Specific Heat Capacity, J/kg-K 480
270
Thermal Conductivity, W/m-K 30
42
Thermal Expansion, µm/m-K 11
7.3

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.6
Embodied Water, L/kg 100
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 94
44
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 1360
93
Stiffness to Weight: Axial, points 14
6.8
Stiffness to Weight: Bending, points 25
18
Strength to Weight: Axial, points 24 to 32
7.2
Strength to Weight: Bending, points 22 to 27
9.5
Thermal Diffusivity, mm2/s 8.1
18
Thermal Shock Resistance, points 23 to 32
21

Alloy Composition

Carbon (C), % 0.36 to 0.42
0 to 0.010
Chromium (Cr), % 12.5 to 14.5
0
Hafnium (Hf), % 0
0 to 0.020
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 83 to 87.1
0 to 0.010
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0
0 to 0.050
Nickel (Ni), % 0
0 to 0.0050
Niobium (Nb), % 0
98.1 to 99.2
Nitrogen (N), % 0
0 to 0.010
Oxygen (O), % 0
0 to 0.025
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.0050
Sulfur (S), % 0 to 0.015
0
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0
0 to 0.020
Tungsten (W), % 0
0 to 0.050
Zirconium (Zr), % 0
0.8 to 1.2