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Type 3 Niobium vs. ACI-ASTM CG8M Steel

Type 3 niobium belongs to the otherwise unclassified metals classification, while ACI-ASTM CG8M 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 3 niobium and the bottom bar is ACI-ASTM CG8M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110
180
Elastic (Young's, Tensile) Modulus, GPa 100
200
Elongation at Break, % 23
45
Poisson's Ratio 0.4
0.28
Shear Modulus, GPa 38
79
Tensile Strength: Ultimate (UTS), MPa 220
550
Tensile Strength: Yield (Proof), MPa 140
300

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Specific Heat Capacity, J/kg-K 270
470
Thermal Conductivity, W/m-K 42
16
Thermal Expansion, µm/m-K 7.3
16

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.9
Embodied Water, L/kg 160
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 44
210
Resilience: Unit (Modulus of Resilience), kJ/m3 93
220
Stiffness to Weight: Axial, points 6.8
14
Stiffness to Weight: Bending, points 18
25
Strength to Weight: Axial, points 7.2
19
Strength to Weight: Bending, points 9.5
19
Thermal Diffusivity, mm2/s 18
4.3
Thermal Shock Resistance, points 21
12

Alloy Composition

Carbon (C), % 0 to 0.010
0 to 0.080
Chromium (Cr), % 0
18 to 21
Hafnium (Hf), % 0 to 0.020
0
Hydrogen (H), % 0 to 0.0015
0
Iron (Fe), % 0 to 0.0050
58.8 to 70
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0 to 0.010
3.0 to 4.0
Nickel (Ni), % 0 to 0.0050
9.0 to 13
Niobium (Nb), % 98.6 to 99.2
0
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 1.5
Sulfur (S), % 0
0 to 0.040
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