SAE-AISI O7 Steel vs. N08135 Stainless Steel

Both SAE-AISI O7 steel and N08135 stainless steel are iron alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 20 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 SAE-AISI O7 steel and the bottom bar is N08135 stainless steel.

SAE-AISI O7 (T31507) Oil-Hardening Steel UNS N08135 Iron-Nickel-Chromium Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		190
Elastic (Young's, Tensile) Modulus, GPa		200

Poisson's Ratio		0.29
Poisson's Ratio		0.28

Shear Modulus, GPa		73
Shear Modulus, GPa		80

Tensile Strength: Ultimate (UTS), MPa		680 to 2110
Tensile Strength: Ultimate (UTS), MPa		570

Thermal Properties

Latent Heat of Fusion, J/g		250
Latent Heat of Fusion, J/g		310

Melting Completion (Liquidus), °C		1480
Melting Completion (Liquidus), °C		1440

Melting Onset (Solidus), °C		1430
Melting Onset (Solidus), °C		1390

Specific Heat Capacity, J/kg-K		470
Specific Heat Capacity, J/kg-K		460

Thermal Expansion, µm/m-K		12
Thermal Expansion, µm/m-K		16

Otherwise Unclassified Properties

Base Metal Price, % relative		6.0
Base Metal Price, % relative		39

Density, g/cm³		7.9
Density, g/cm³		8.2

Embodied Carbon, kg CO₂/kg material		2.3
Embodied Carbon, kg CO₂/kg material		6.8

Embodied Energy, MJ/kg		33
Embodied Energy, MJ/kg		94

Embodied Water, L/kg		52
Embodied Water, L/kg		220

Common Calculations

PREN (Pitting Resistance)		3.6
PREN (Pitting Resistance)		38

Stiffness to Weight: Axial, points		13
Stiffness to Weight: Axial, points		14

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

Strength to Weight: Axial, points		24 to 74
Strength to Weight: Axial, points		19

Strength to Weight: Bending, points		22 to 46
Strength to Weight: Bending, points		19

Thermal Shock Resistance, points		23 to 70
Thermal Shock Resistance, points		13

Alloy Composition

Carbon (C), %		1.1 to 1.3
Carbon (C), %		0 to 0.030

Chromium (Cr), %		0.35 to 0.85
Chromium (Cr), %		20.5 to 23.5

Copper (Cu), %		0 to 0.25
Copper (Cu), %		0 to 0.7

Iron (Fe), %		92.9 to 97.6
Iron (Fe), %		30.2 to 42.3

Manganese (Mn), %		0 to 1.0
Manganese (Mn), %		0 to 1.0

Molybdenum (Mo), %		0 to 0.3
Molybdenum (Mo), %		4.0 to 5.0

Nickel (Ni), %		0 to 0.3
Nickel (Ni), %		33 to 38

Phosphorus (P), %		0 to 0.030
Phosphorus (P), %		0 to 0.030

Silicon (Si), %		0 to 0.6
Silicon (Si), %		0 to 0.75

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

Tungsten (W), %		1.0 to 2.0
Tungsten (W), %		0.2 to 0.8

Vanadium (V), %		0 to 0.4
Vanadium (V), %		0