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EN 1.1151 Steel vs. SAE-AISI 4140 Steel

Both EN 1.1151 steel and SAE-AISI 4140 steel are iron alloys. They have a very high 99% of their average alloy composition in common.

For each property being compared, the top bar is EN 1.1151 steel and the bottom bar is SAE-AISI 4140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 130 to 150
200 to 310
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 21 to 26
11 to 26
Fatigue Strength, MPa 180 to 240
360 to 650
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 300 to 330
410 to 660
Tensile Strength: Ultimate (UTS), MPa 460 to 520
690 to 1080
Tensile Strength: Yield (Proof), MPa 240 to 340
590 to 990

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
420
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 50
43
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
2.4
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.5
Embodied Energy, MJ/kg 19
20
Embodied Water, L/kg 47
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 100
74 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 160 to 310
920 to 2590
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 16 to 18
25 to 38
Strength to Weight: Bending, points 17 to 18
22 to 30
Thermal Diffusivity, mm2/s 13
12
Thermal Shock Resistance, points 15 to 16
20 to 32

Alloy Composition

Carbon (C), % 0.17 to 0.24
0.38 to 0.43
Chromium (Cr), % 0 to 0.4
0.8 to 1.1
Iron (Fe), % 97.7 to 99.43
96.8 to 97.8
Manganese (Mn), % 0.4 to 0.7
0.75 to 1.0
Molybdenum (Mo), % 0 to 0.1
0.15 to 0.25
Nickel (Ni), % 0 to 0.4
0
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.035
0 to 0.040

Comparable Variants