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 |