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SAE-AISI 4140 Steel vs. EN 1.1141 Steel

Both SAE-AISI 4140 steel and EN 1.1141 steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI 4140 steel and the bottom bar is EN 1.1141 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 310
120
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 26
28
Fatigue Strength, MPa 360 to 650
170
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 410 to 660
280
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
420
Tensile Strength: Yield (Proof), MPa 590 to 990
220

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
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 43
51
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
1.8
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 20
18
Embodied Water, L/kg 51
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
99
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
130
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25 to 38
15
Strength to Weight: Bending, points 22 to 30
16
Thermal Diffusivity, mm2/s 12
14
Thermal Shock Resistance, points 20 to 32
13

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.12 to 0.18
Chromium (Cr), % 0.8 to 1.1
0
Iron (Fe), % 96.8 to 97.8
98.8 to 99.58
Manganese (Mn), % 0.75 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0.15 to 0.25
0
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.040
0 to 0.035