SAE-AISI 5155 Steel vs. R04295 Alloy

SAE-AISI 5155 steel belongs to the iron alloys classification, while R04295 alloy belongs to the otherwise unclassified metals. There are 18 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 SAE-AISI 5155 steel and the bottom bar is R04295 alloy.

SAE-AISI 5155 (G51550) Chromium Steel UNS R04295 Niobium-Hafnium Alloy

Metric UnitsUS Customary Units

Mechanical Properties

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

Elongation at Break, %		21
Elongation at Break, %		22

Poisson's Ratio		0.29
Poisson's Ratio		0.38

Shear Modulus, GPa		73
Shear Modulus, GPa		37

Tensile Strength: Ultimate (UTS), MPa		620
Tensile Strength: Ultimate (UTS), MPa		410

Tensile Strength: Yield (Proof), MPa		380
Tensile Strength: Yield (Proof), MPa		300

Thermal Properties

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

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

Thermal Expansion, µm/m-K		12
Thermal Expansion, µm/m-K		7.2

Otherwise Unclassified Properties

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

Embodied Water, L/kg		49
Embodied Water, L/kg		950

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		110
Resilience: Ultimate (Unit Rupture Work), MJ/m³		84

Resilience: Unit (Modulus of Resilience), kJ/m³		380
Resilience: Unit (Modulus of Resilience), kJ/m³		430

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

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

Strength to Weight: Axial, points		22
Strength to Weight: Axial, points		13

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

Thermal Shock Resistance, points		20
Thermal Shock Resistance, points		40

Alloy Composition

Carbon (C), %		0.51 to 0.59
Carbon (C), %		0 to 0.015

Chromium (Cr), %		0.7 to 0.9
Chromium (Cr), %		0

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

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

Iron (Fe), %		97.2 to 97.9
Iron (Fe), %		0

Manganese (Mn), %		0.7 to 0.9
Manganese (Mn), %		0

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

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

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

Phosphorus (P), %		0 to 0.035
Phosphorus (P), %		0

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

Sulfur (S), %		0 to 0.040
Sulfur (S), %		0

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

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

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

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