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EN 1.7230 Steel vs. SAE-AISI 4118 Steel

Both EN 1.7230 steel and SAE-AISI 4118 steel are iron alloys. Their average alloy composition is basically identical. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is EN 1.7230 steel and the bottom bar is SAE-AISI 4118 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 270
150
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 12
23
Fatigue Strength, MPa 320 to 460
230
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 720 to 910
500
Tensile Strength: Yield (Proof), MPa 510 to 740
320

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
410
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 44
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 20
20
Embodied Water, L/kg 51
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 97
100
Resilience: Unit (Modulus of Resilience), kJ/m3 700 to 1460
280
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 26 to 32
18
Strength to Weight: Bending, points 23 to 27
18
Thermal Diffusivity, mm2/s 12
13
Thermal Shock Resistance, points 21 to 27
15

Alloy Composition

Carbon (C), % 0.3 to 0.37
0.18 to 0.23
Chromium (Cr), % 0.8 to 1.2
0.4 to 0.6
Iron (Fe), % 96.7 to 98.3
97.5 to 98.4
Manganese (Mn), % 0.5 to 0.8
0.7 to 0.9
Molybdenum (Mo), % 0.15 to 0.3
0.2 to 0.3
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 0.6
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040