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S21904 Stainless Steel vs. Type 3 Niobium

S21904 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 (12, in this case) are not shown.

For each property being compared, the top bar is S21904 stainless steel and the bottom bar is Type 3 niobium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
110
Elastic (Young's, Tensile) Modulus, GPa 200
100
Elongation at Break, % 17 to 51
23
Poisson's Ratio 0.28
0.4
Shear Modulus, GPa 78
38
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
220
Tensile Strength: Yield (Proof), MPa 390 to 910
140

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Specific Heat Capacity, J/kg-K 480
270
Thermal Conductivity, W/m-K 14
42
Thermal Expansion, µm/m-K 17
7.3

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
44
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
93
Stiffness to Weight: Axial, points 14
6.8
Stiffness to Weight: Bending, points 25
18
Strength to Weight: Axial, points 25 to 36
7.2
Strength to Weight: Bending, points 23 to 29
9.5
Thermal Diffusivity, mm2/s 3.8
18
Thermal Shock Resistance, points 15 to 21
21

Alloy Composition

Carbon (C), % 0 to 0.040
0 to 0.010
Chromium (Cr), % 19 to 21.5
0
Hafnium (Hf), % 0
0 to 0.020
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 59.5 to 67.4
0 to 0.0050
Manganese (Mn), % 8.0 to 10
0
Molybdenum (Mo), % 0
0 to 0.010
Nickel (Ni), % 5.5 to 7.5
0 to 0.0050
Niobium (Nb), % 0
98.6 to 99.2
Nitrogen (N), % 0.15 to 0.4
0 to 0.010
Oxygen (O), % 0
0 to 0.015
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
0 to 0.0050
Sulfur (S), % 0 to 0.030
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