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SAE-AISI 4118 Steel vs. ACI-ASTM CA15 Steel

Both SAE-AISI 4118 steel and ACI-ASTM CA15 steel are iron alloys. They have 87% 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 4118 steel and the bottom bar is ACI-ASTM CA15 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
220
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 23
21
Fatigue Strength, MPa 230
370
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 500
700
Tensile Strength: Yield (Proof), MPa 320
570

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Maximum Temperature: Mechanical, °C 410
750
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1500
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 46
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
7.5
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.5
2.0
Embodied Energy, MJ/kg 20
28
Embodied Water, L/kg 49
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
140
Resilience: Unit (Modulus of Resilience), kJ/m3 280
820
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
25
Strength to Weight: Bending, points 18
23
Thermal Diffusivity, mm2/s 13
6.7
Thermal Shock Resistance, points 15
26

Alloy Composition

Carbon (C), % 0.18 to 0.23
0 to 0.15
Chromium (Cr), % 0.4 to 0.6
11.5 to 14
Iron (Fe), % 97.5 to 98.4
81.8 to 88.5
Manganese (Mn), % 0.7 to 0.9
0 to 1.0
Molybdenum (Mo), % 0.2 to 0.3
0 to 0.5
Nickel (Ni), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.5
Sulfur (S), % 0 to 0.040
0 to 0.040