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SAE-AISI 1144 Steel vs. ACI-ASTM CF20 Steel

Both SAE-AISI 1144 steel and ACI-ASTM CF20 steel are iron alloys. They have 70% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1144 steel and the bottom bar is ACI-ASTM CF20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 230
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 17
50
Fatigue Strength, MPa 280 to 430
240
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
77
Tensile Strength: Ultimate (UTS), MPa 750 to 840
530
Tensile Strength: Yield (Proof), MPa 420 to 690
250

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 400
970
Melting Completion (Liquidus), °C 1450
1420
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 51
16
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
16
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
3.1
Embodied Energy, MJ/kg 19
44
Embodied Water, L/kg 47
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 91 to 110
220
Resilience: Unit (Modulus of Resilience), kJ/m3 480 to 1290
160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 27 to 30
19
Strength to Weight: Bending, points 23 to 25
19
Thermal Diffusivity, mm2/s 14
4.3
Thermal Shock Resistance, points 22 to 24
11

Alloy Composition

Carbon (C), % 0.4 to 0.48
0 to 0.2
Chromium (Cr), % 0
18 to 21
Iron (Fe), % 97.5 to 98
64.2 to 74
Manganese (Mn), % 1.4 to 1.7
0 to 1.5
Nickel (Ni), % 0
8.0 to 11
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 2.0
Sulfur (S), % 0.24 to 0.33
0 to 0.040