R04295 Alloy vs. ASTM A227 Spring Steel

R04295 alloy belongs to the otherwise unclassified metals classification, while ASTM A227 spring steel belongs to the iron alloys. There are 17 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is R04295 alloy and the bottom bar is ASTM A227 spring steel.

UNS R04295 Niobium-Hafnium Alloy ASTM A227 Spring Steel

Metric UnitsUS Customary Units

Mechanical Properties

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

Elongation at Break, %		22
Elongation at Break, %		12

Poisson's Ratio		0.38
Poisson's Ratio		0.29

Shear Modulus, GPa		37
Shear Modulus, GPa		72

Tensile Strength: Ultimate (UTS), MPa		410
Tensile Strength: Ultimate (UTS), MPa		1720 to 2220

Tensile Strength: Yield (Proof), MPa		300
Tensile Strength: Yield (Proof), MPa		1430 to 1850

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		12

Otherwise Unclassified Properties

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

Embodied Water, L/kg		950
Embodied Water, L/kg		46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		84
Resilience: Ultimate (Unit Rupture Work), MJ/m³		200 to 260

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		61 to 79

Strength to Weight: Bending, points		14
Strength to Weight: Bending, points		41 to 48

Thermal Shock Resistance, points		40
Thermal Shock Resistance, points		55 to 71

Alloy Composition

Carbon (C), %		0 to 0.015
Carbon (C), %		0.45 to 0.85

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

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

Iron (Fe), %		0
Iron (Fe), %		97.4 to 99.1

Manganese (Mn), %		0
Manganese (Mn), %		0.3 to 1.3

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 0.040

Silicon (Si), %		0
Silicon (Si), %		0.15 to 0.35

Sulfur (S), %		0
Sulfur (S), %		0 to 0.050

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

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