R04295 Alloy vs. EN 1.7709 Steel

R04295 alloy belongs to the otherwise unclassified metals classification, while EN 1.7709 steel belongs to the iron alloys. There are 14 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

For each property being compared, the top bar is R04295 alloy and the bottom bar is EN 1.7709 steel.

UNS R04295 Niobium-Hafnium Alloy EN 1.7709 (21CrMoV5-7) Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		100
Elastic (Young's, Tensile) Modulus, GPa		190

Poisson's Ratio		0.38
Poisson's Ratio		0.29

Shear Modulus, GPa		37
Shear Modulus, GPa		73

Tensile Strength: Ultimate (UTS), MPa		410
Tensile Strength: Ultimate (UTS), MPa		650 to 780

Thermal Properties

Latent Heat of Fusion, J/g		300
Latent Heat of Fusion, J/g		250

Specific Heat Capacity, J/kg-K		260
Specific Heat Capacity, J/kg-K		470

Thermal Expansion, µm/m-K		7.2
Thermal Expansion, µm/m-K		11

Otherwise Unclassified Properties

Density, g/cm³		9.0
Density, g/cm³		7.8

Embodied Water, L/kg		950
Embodied Water, L/kg		56

Common Calculations

Stiffness to Weight: Axial, points		6.3
Stiffness to Weight: Axial, points		13

Stiffness to Weight: Bending, points		17
Stiffness to Weight: Bending, points		24

Strength to Weight: Axial, points		13
Strength to Weight: Axial, points		23 to 27

Strength to Weight: Bending, points		14
Strength to Weight: Bending, points		21 to 24

Thermal Shock Resistance, points		40
Thermal Shock Resistance, points		22 to 26

Alloy Composition

Aluminum (Al), %		0
Aluminum (Al), %		0 to 0.030

Carbon (C), %		0 to 0.015
Carbon (C), %		0.17 to 0.25

Chromium (Cr), %		0
Chromium (Cr), %		1.2 to 1.5

Hafnium (Hf), %		9.0 to 11
Hafnium (Hf), %		0

Hydrogen (H), %		0 to 0.0015
Hydrogen (H), %		0

Iron (Fe), %		0
Iron (Fe), %		95.2 to 97.5

Manganese (Mn), %		0
Manganese (Mn), %		0.4 to 0.8

Molybdenum (Mo), %		0
Molybdenum (Mo), %		0.55 to 0.8

Nickel (Ni), %		0
Nickel (Ni), %		0 to 0.6

Niobium (Nb), %		85.9 to 90.3
Niobium (Nb), %		0

Nitrogen (N), %		0 to 0.010
Nitrogen (N), %		0

Oxygen (O), %		0 to 0.025
Oxygen (O), %		0

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.025

Silicon (Si), %		0
Silicon (Si), %		0 to 0.4

Sulfur (S), %		0
Sulfur (S), %		0 to 0.030

Tantalum (Ta), %		0 to 0.5
Tantalum (Ta), %		0

Titanium (Ti), %		0.7 to 1.3
Titanium (Ti), %		0

Tungsten (W), %		0 to 0.5
Tungsten (W), %		0

Vanadium (V), %		0
Vanadium (V), %		0.2 to 0.35

Zirconium (Zr), %		0 to 0.7
Zirconium (Zr), %		0