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SAE-AISI 4140 Steel vs. SAE-AISI 4145 Steel

Both SAE-AISI 4140 steel and SAE-AISI 4145 steel are iron alloys. Their average alloy composition is basically identical. There are 31 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 SAE-AISI 4140 steel and the bottom bar is SAE-AISI 4145 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 310
310
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 26
16
Fatigue Strength, MPa 360 to 650
240
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 410 to 660
360
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
580
Tensile Strength: Yield (Proof), MPa 590 to 990
360

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
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 43
42
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
2.4
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
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
80
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
350
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25 to 38
21
Strength to Weight: Bending, points 22 to 30
20
Thermal Diffusivity, mm2/s 12
11
Thermal Shock Resistance, points 20 to 32
17

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.43 to 0.48
Chromium (Cr), % 0.8 to 1.1
0.8 to 1.1
Iron (Fe), % 96.8 to 97.8
96.7 to 97.7
Manganese (Mn), % 0.75 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0.15 to 0.25
0.15 to 0.25
Phosphorus (P), % 0 to 0.035
0 to 0.035
Silicon (Si), % 0.15 to 0.35
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.040