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SAE-AISI S7 Steel vs. ACI-ASTM CF20 Steel

Both SAE-AISI S7 steel and ACI-ASTM CF20 steel are iron alloys. They have 74% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI S7 steel and the bottom bar is ACI-ASTM CF20 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 74
77
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
530

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 40
16
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
16
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.3
3.1
Embodied Energy, MJ/kg 31
44
Embodied Water, L/kg 65
150

Common Calculations

PREN (Pitting Resistance) 8.4
20
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24 to 72
19
Strength to Weight: Bending, points 22 to 46
19
Thermal Diffusivity, mm2/s 11
4.3
Thermal Shock Resistance, points 22 to 66
11

Alloy Composition

Carbon (C), % 0.45 to 0.55
0 to 0.2
Chromium (Cr), % 3.0 to 3.5
18 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 91.6 to 94.9
64.2 to 74
Manganese (Mn), % 0.2 to 0.9
0 to 1.5
Molybdenum (Mo), % 1.3 to 1.8
0
Nickel (Ni), % 0
8.0 to 11
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040
Vanadium (V), % 0 to 0.3
0