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ACI-ASTM CF20 Steel vs. SAE-AISI 8660 Steel

Both ACI-ASTM CF20 steel and SAE-AISI 8660 steel are iron alloys. They have 71% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CF20 steel and the bottom bar is SAE-AISI 8660 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 50
12
Fatigue Strength, MPa 240
340
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 530
660
Tensile Strength: Yield (Proof), MPa 250
550

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 970
410
Melting Completion (Liquidus), °C 1420
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
39
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 16
2.6
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.1
1.5
Embodied Energy, MJ/kg 44
20
Embodied Water, L/kg 150
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
73
Resilience: Unit (Modulus of Resilience), kJ/m3 160
800
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
23
Strength to Weight: Bending, points 19
21
Thermal Diffusivity, mm2/s 4.3
10
Thermal Shock Resistance, points 11
19

Alloy Composition

Carbon (C), % 0 to 0.2
0.56 to 0.64
Chromium (Cr), % 18 to 21
0.4 to 0.6
Iron (Fe), % 64.2 to 74
96.4 to 97.6
Manganese (Mn), % 0 to 1.5
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 8.0 to 11
0.4 to 0.7
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 2.0
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.040