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SAE-AISI O2 Steel vs. ACI-ASTM CN7MS Steel

Both SAE-AISI O2 steel and ACI-ASTM CN7MS steel are iron alloys. They have 51% 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 O2 steel and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Tensile Strength: Ultimate (UTS), MPa 640 to 2050
540

Thermal Properties

Latent Heat of Fusion, J/g 250
340
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1410
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 43
12
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
28
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.8
5.1
Embodied Energy, MJ/kg 26
71
Embodied Water, L/kg 50
180

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23 to 73
19
Strength to Weight: Bending, points 21 to 46
19
Thermal Diffusivity, mm2/s 12
3.2
Thermal Shock Resistance, points 22 to 70
13

Alloy Composition

Carbon (C), % 0.85 to 1.0
0 to 0.070
Chromium (Cr), % 0 to 0.5
18 to 20
Copper (Cu), % 0 to 0.25
1.5 to 2.0
Iron (Fe), % 95 to 97.8
45.4 to 53.5
Manganese (Mn), % 1.4 to 1.8
0 to 1.0
Molybdenum (Mo), % 0 to 0.3
2.5 to 3.0
Nickel (Ni), % 0 to 0.3
22 to 25
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.5
2.5 to 3.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0 to 0.3
0