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ACI-ASTM CF8C Steel vs. SAE-AISI 5140 Steel

Both ACI-ASTM CF8C steel and SAE-AISI 5140 steel are iron alloys. They have 69% 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 CF8C steel and the bottom bar is SAE-AISI 5140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
170 to 290
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40
12 to 29
Fatigue Strength, MPa 220
220 to 570
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 530
560 to 970
Tensile Strength: Yield (Proof), MPa 260
290 to 840

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 980
420
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
45
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 19
2.1
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.7
1.4
Embodied Energy, MJ/kg 53
19
Embodied Water, L/kg 150
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
76 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 170
220 to 1880
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
20 to 34
Strength to Weight: Bending, points 19
19 to 28
Thermal Diffusivity, mm2/s 4.3
12
Thermal Shock Resistance, points 11
16 to 29

Alloy Composition

Carbon (C), % 0 to 0.080
0.38 to 0.43
Chromium (Cr), % 18 to 21
0.7 to 0.9
Iron (Fe), % 61.8 to 73
97.3 to 98.1
Manganese (Mn), % 0 to 1.5
0.7 to 0.9
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 9.0 to 12
0
Niobium (Nb), % 0 to 1.0
0
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