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S82121 Stainless Steel vs. Type 3 Niobium

S82121 stainless steel belongs to the iron alloys classification, while Type 3 niobium belongs to the otherwise unclassified metals. 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 S82121 stainless steel and the bottom bar is Type 3 niobium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
110
Elastic (Young's, Tensile) Modulus, GPa 200
100
Elongation at Break, % 28
23
Poisson's Ratio 0.27
0.4
Shear Modulus, GPa 78
38
Tensile Strength: Ultimate (UTS), MPa 730
220
Tensile Strength: Yield (Proof), MPa 510
140

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Specific Heat Capacity, J/kg-K 480
270
Thermal Conductivity, W/m-K 15
42
Thermal Expansion, µm/m-K 13
7.3

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
44
Resilience: Unit (Modulus of Resilience), kJ/m3 660
93
Stiffness to Weight: Axial, points 14
6.8
Stiffness to Weight: Bending, points 25
18
Strength to Weight: Axial, points 26
7.2
Strength to Weight: Bending, points 23
9.5
Thermal Diffusivity, mm2/s 4.0
18
Thermal Shock Resistance, points 20
21

Alloy Composition

Carbon (C), % 0 to 0.035
0 to 0.010
Chromium (Cr), % 21 to 23
0
Copper (Cu), % 0.2 to 1.2
0
Hafnium (Hf), % 0
0 to 0.020
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 66.7 to 75.4
0 to 0.0050
Manganese (Mn), % 1.0 to 2.5
0
Molybdenum (Mo), % 0.3 to 1.3
0 to 0.010
Nickel (Ni), % 2.0 to 4.0
0 to 0.0050
Niobium (Nb), % 0
98.6 to 99.2
Nitrogen (N), % 0.15 to 0.25
0 to 0.010
Oxygen (O), % 0
0 to 0.015
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.0050
Sulfur (S), % 0 to 0.010
0
Tantalum (Ta), % 0
0 to 0.1
Titanium (Ti), % 0
0 to 0.020
Tungsten (W), % 0
0 to 0.030
Zirconium (Zr), % 0
0.8 to 1.2