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Type 4 Niobium vs. S21640 Stainless Steel

Type 4 niobium belongs to the otherwise unclassified metals classification, while S21640 stainless steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is Type 4 niobium and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
230
Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 23
46
Poisson's Ratio 0.4
0.28
Shear Modulus, GPa 38
78
Tensile Strength: Ultimate (UTS), MPa 220
740
Tensile Strength: Yield (Proof), MPa 140
350

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Specific Heat Capacity, J/kg-K 270
480
Thermal Conductivity, W/m-K 42
15
Thermal Expansion, µm/m-K 7.3
17

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.7
Embodied Water, L/kg 160
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 44
280
Resilience: Unit (Modulus of Resilience), kJ/m3 93
300
Stiffness to Weight: Axial, points 6.8
14
Stiffness to Weight: Bending, points 18
25
Strength to Weight: Axial, points 7.2
27
Strength to Weight: Bending, points 9.5
23
Thermal Diffusivity, mm2/s 18
4.0
Thermal Shock Resistance, points 21
16

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.080
Chromium (Cr), % 0
17.5 to 19.5
Hafnium (Hf), % 0 to 0.020
0
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.010
63 to 74.3
Manganese (Mn), % 0
3.5 to 6.5
Molybdenum (Mo), % 0 to 0.050
0.5 to 2.0
Nickel (Ni), % 0 to 0.0050
4.0 to 6.5
Niobium (Nb), % 98.1 to 99.2
0.1 to 1.0
Nitrogen (N), % 0 to 0.010
0.080 to 0.3
Oxygen (O), % 0 to 0.025
0
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 0 to 0.0050
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0 to 0.5
0
Titanium (Ti), % 0 to 0.020
0
Tungsten (W), % 0 to 0.050
0
Zirconium (Zr), % 0.8 to 1.2
0