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SAE-AISI 4140 Steel vs. SAE-AISI 50B46 Steel

Both SAE-AISI 4140 steel and SAE-AISI 50B46 steel are iron alloys. Their average alloy composition is basically identical.

For each property being compared, the top bar is SAE-AISI 4140 steel and the bottom bar is SAE-AISI 50B46 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 310
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 26
21
Fatigue Strength, MPa 360 to 650
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Shear Strength, MPa 410 to 660
340
Tensile Strength: Ultimate (UTS), MPa 690 to 1080
540
Tensile Strength: Yield (Proof), MPa 590 to 990
310

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 43
47
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
1.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 20
19
Embodied Water, L/kg 51
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 74 to 180
99
Resilience: Unit (Modulus of Resilience), kJ/m3 920 to 2590
260
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 25 to 38
19
Strength to Weight: Bending, points 22 to 30
19
Thermal Diffusivity, mm2/s 12
13
Thermal Shock Resistance, points 20 to 32
16

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0.38 to 0.43
0.44 to 0.49
Chromium (Cr), % 0.8 to 1.1
0.2 to 0.35
Iron (Fe), % 96.8 to 97.8
97.7 to 98.5
Manganese (Mn), % 0.75 to 1.0
0.75 to 1.0
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
0.15 to 0.35
Sulfur (S), % 0 to 0.040
0 to 0.040