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Type 1 Niobium vs. S81921 Stainless Steel

Type 1 niobium belongs to the otherwise unclassified metals classification, while S81921 stainless steel belongs to the iron alloys. There are 21 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 Type 1 niobium and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 79
260
Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 29
29
Poisson's Ratio 0.4
0.28
Shear Modulus, GPa 38
79
Tensile Strength: Ultimate (UTS), MPa 140
710
Tensile Strength: Yield (Proof), MPa 82
500

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Specific Heat Capacity, J/kg-K 270
480
Thermal Conductivity, W/m-K 52
15
Thermal Expansion, µm/m-K 7.3
13

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 35
180
Resilience: Unit (Modulus of Resilience), kJ/m3 32
630
Stiffness to Weight: Axial, points 6.8
14
Stiffness to Weight: Bending, points 18
25
Strength to Weight: Axial, points 4.6
25
Strength to Weight: Bending, points 7.1
23
Thermal Diffusivity, mm2/s 23
4.0
Thermal Shock Resistance, points 13
20

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.030
Chromium (Cr), % 0
19 to 22
Hafnium (Hf), % 0 to 0.020
0
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.0050
66.7 to 75.9
Manganese (Mn), % 0
2.0 to 4.0
Molybdenum (Mo), % 0 to 0.010
1.0 to 2.0
Nickel (Ni), % 0 to 0.0050
2.0 to 4.0
Niobium (Nb), % 99.7 to 100
0
Nitrogen (N), % 0 to 0.010
0.14 to 0.2
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 to 0.020
0