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ACI-ASTM CF8M Steel vs. SAE-AISI S2 Steel

Both ACI-ASTM CF8M steel and SAE-AISI S2 steel are iron alloys. They have 68% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CF8M steel and the bottom bar is SAE-AISI S2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
72
Tensile Strength: Ultimate (UTS), MPa 540
670 to 1940

Thermal Properties

Latent Heat of Fusion, J/g 300
260
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1400
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
44
Thermal Expansion, µm/m-K 16
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 19
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.8
2.1
Embodied Energy, MJ/kg 53
30
Embodied Water, L/kg 160
49

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
24 to 69
Strength to Weight: Bending, points 19
22 to 44
Thermal Diffusivity, mm2/s 4.3
12
Thermal Shock Resistance, points 12
23 to 68

Alloy Composition

Carbon (C), % 0 to 0.080
0.4 to 0.55
Chromium (Cr), % 18 to 21
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 60.3 to 71
96 to 98.1
Manganese (Mn), % 0 to 1.5
0.3 to 0.5
Molybdenum (Mo), % 2.0 to 3.0
0.3 to 0.6
Nickel (Ni), % 9.0 to 12
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 2.0
0.9 to 1.2
Sulfur (S), % 0 to 0.040
0 to 0.030
Vanadium (V), % 0
0 to 0.5