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SAE-AISI 4024 Steel vs. SAE-AISI 1118 Steel

Both SAE-AISI 4024 steel and SAE-AISI 1118 steel are iron alloys. Both are furnished in the cold worked (strain hardened) condition. Their average alloy composition is basically identical.

For each property being compared, the top bar is SAE-AISI 4024 steel and the bottom bar is SAE-AISI 1118 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 14
13
Fatigue Strength, MPa 320
260
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 370
300
Tensile Strength: Ultimate (UTS), MPa 600
490
Tensile Strength: Yield (Proof), MPa 500
410

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
400
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51
52
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
1.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 19
19
Embodied Water, L/kg 47
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77
61
Resilience: Unit (Modulus of Resilience), kJ/m3 670
450
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 21
17
Strength to Weight: Bending, points 20
18
Thermal Diffusivity, mm2/s 14
14
Thermal Shock Resistance, points 18
15

Alloy Composition

Carbon (C), % 0.2 to 0.25
0.14 to 0.2
Iron (Fe), % 98.1 to 98.7
98 to 98.5
Manganese (Mn), % 0.7 to 0.9
1.3 to 1.6
Molybdenum (Mo), % 0.2 to 0.3
0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0.035 to 0.050
0.080 to 0.13