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Type 3 Niobium vs. S17400 Stainless Steel

Type 3 niobium belongs to the otherwise unclassified metals classification, while S17400 stainless steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is Type 3 niobium and the bottom bar is S17400 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110
280 to 440
Elastic (Young's, Tensile) Modulus, GPa 100
190
Elongation at Break, % 23
11 to 21
Poisson's Ratio 0.4
0.28
Shear Modulus, GPa 38
75
Tensile Strength: Ultimate (UTS), MPa 220
910 to 1390
Tensile Strength: Yield (Proof), MPa 140
580 to 1250

Thermal Properties

Latent Heat of Fusion, J/g 310
280
Specific Heat Capacity, J/kg-K 270
480
Thermal Conductivity, W/m-K 42
17
Thermal Expansion, µm/m-K 7.3
11

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Water, L/kg 160
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 44
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 93
880 to 4060
Stiffness to Weight: Axial, points 6.8
14
Stiffness to Weight: Bending, points 18
25
Strength to Weight: Axial, points 7.2
32 to 49
Strength to Weight: Bending, points 9.5
27 to 35
Thermal Diffusivity, mm2/s 18
4.5
Thermal Shock Resistance, points 21
30 to 46

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.070
Chromium (Cr), % 0
15 to 17
Copper (Cu), % 0
3.0 to 5.0
Hafnium (Hf), % 0 to 0.020
0
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.0050
70.4 to 78.9
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0 to 0.010
0
Nickel (Ni), % 0 to 0.0050
3.0 to 5.0
Niobium (Nb), % 98.6 to 99.2
0.15 to 0.45
Nitrogen (N), % 0 to 0.010
0
Oxygen (O), % 0 to 0.015
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.0050
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0 to 0.1
0
Titanium (Ti), % 0 to 0.020
0
Tungsten (W), % 0 to 0.030
0
Zirconium (Zr), % 0.8 to 1.2
0