SAE-AISI 4320 Steel vs. SAE-AISI 1140 Steel
Both SAE-AISI 4320 steel and SAE-AISI 1140 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 4320 steel and the bottom bar is SAE-AISI 1140 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 160 to 240 | |
170 to 180 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 21 to 29 | |
14 to 18 |
Fatigue Strength, MPa | 320 | |
230 to 370 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 73 | |
72 |
Shear Strength, MPa | 370 to 500 | |
370 to 420 |
Tensile Strength: Ultimate (UTS), MPa | 570 to 790 | |
600 to 700 |
Tensile Strength: Yield (Proof), MPa | 430 to 460 | |
340 to 570 |
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 | 46 | |
51 |
Thermal Expansion, µm/m-K | 11 | |
13 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
7.0 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.5 | |
8.1 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 3.4 | |
1.8 |
Density, g/cm3 | 7.9 | |
7.8 |
Embodied Carbon, kg CO2/kg material | 1.7 | |
1.4 |
Embodied Energy, MJ/kg | 22 | |
18 |
Embodied Water, L/kg | 52 | |
46 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 150 | |
89 to 93 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 480 to 560 | |
310 to 870 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 20 to 28 | |
21 to 25 |
Strength to Weight: Bending, points | 19 to 24 | |
20 to 22 |
Thermal Diffusivity, mm2/s | 13 | |
14 |
Thermal Shock Resistance, points | 19 to 27 | |
18 to 21 |
Alloy Composition
Carbon (C), % | 0.17 to 0.22 | |
0.37 to 0.44 |
Chromium (Cr), % | 0.4 to 0.6 | |
0 |
Iron (Fe), % | 95.8 to 97 | |
98.4 to 98.9 |
Manganese (Mn), % | 0.45 to 0.65 | |
0.7 to 1.0 |
Molybdenum (Mo), % | 0.2 to 0.3 | |
0 |
Nickel (Ni), % | 1.7 to 2.0 | |
0 |
Phosphorus (P), % | 0 to 0.035 | |
0 to 0.040 |
Silicon (Si), % | 0.15 to 0.35 | |
0 |
Sulfur (S), % | 0 to 0.040 | |
0.080 to 0.13 |