SAE-AISI O6 Steel vs. ACI-ASTM CN7MS Steel

Both SAE-AISI O6 steel and ACI-ASTM CN7MS steel are iron alloys. They have 52% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI O6 steel and the bottom bar is ACI-ASTM CN7MS steel.

SAE-AISI O6 (T31506) Oil-Hardening Steel ACI-ASTM CN7MS (J94650) Cast Stainless Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		180
Elastic (Young's, Tensile) Modulus, GPa		200

Poisson's Ratio		0.29
Poisson's Ratio		0.28

Shear Modulus, GPa		71
Shear Modulus, GPa		77

Tensile Strength: Ultimate (UTS), MPa		670 to 2070
Tensile Strength: Ultimate (UTS), MPa		540

Thermal Properties

Latent Heat of Fusion, J/g		260
Latent Heat of Fusion, J/g		340

Melting Completion (Liquidus), °C		1430
Melting Completion (Liquidus), °C		1400

Melting Onset (Solidus), °C		1390
Melting Onset (Solidus), °C		1350

Specific Heat Capacity, J/kg-K		480
Specific Heat Capacity, J/kg-K		480

Thermal Conductivity, W/m-K		43
Thermal Conductivity, W/m-K		12

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

Otherwise Unclassified Properties

Base Metal Price, % relative		2.3
Base Metal Price, % relative		28

Density, g/cm³		7.7
Density, g/cm³		7.9

Embodied Carbon, kg CO₂/kg material		1.5
Embodied Carbon, kg CO₂/kg material		5.1

Embodied Energy, MJ/kg		21
Embodied Energy, MJ/kg		71

Embodied Water, L/kg		47
Embodied Water, L/kg		180

Common Calculations

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

Stiffness to Weight: Bending, points		25
Stiffness to Weight: Bending, points		25

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

Strength to Weight: Bending, points		22 to 47
Strength to Weight: Bending, points		19

Thermal Diffusivity, mm²/s		12
Thermal Diffusivity, mm²/s		3.2

Thermal Shock Resistance, points		22 to 69
Thermal Shock Resistance, points		13

Alloy Composition

Carbon (C), %		1.3 to 1.6
Carbon (C), %		0 to 0.070

Chromium (Cr), %		0 to 0.3
Chromium (Cr), %		18 to 20

Copper (Cu), %		0 to 0.25
Copper (Cu), %		1.5 to 2.0

Iron (Fe), %		94.6 to 97.7
Iron (Fe), %		45.4 to 53.5

Manganese (Mn), %		0.3 to 1.1
Manganese (Mn), %		0 to 1.0

Molybdenum (Mo), %		0.2 to 0.3
Molybdenum (Mo), %		2.5 to 3.0

Nickel (Ni), %		0 to 0.3
Nickel (Ni), %		22 to 25

Phosphorus (P), %		0 to 0.030
Phosphorus (P), %		0 to 0.040

Silicon (Si), %		0.55 to 1.5
Silicon (Si), %		2.5 to 3.5

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