SAE-AISI 5145 Steel vs. SAE-AISI 4145 Steel
Both SAE-AISI 5145 steel and SAE-AISI 4145 steel are iron alloys. Both are furnished in the annealed condition. 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 5145 steel and the bottom bar is SAE-AISI 4145 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 170 | |
310 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 20 | |
16 |
Fatigue Strength, MPa | 250 | |
240 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 73 | |
73 |
Shear Strength, MPa | 350 | |
360 |
Tensile Strength: Ultimate (UTS), MPa | 560 | |
580 |
Tensile Strength: Yield (Proof), MPa | 370 | |
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 | 1410 | |
1420 |
Specific Heat Capacity, J/kg-K | 470 | |
470 |
Thermal Conductivity, W/m-K | 47 | |
42 |
Thermal Expansion, µm/m-K | 12 | |
13 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
7.3 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
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 | 49 | |
51 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 100 | |
80 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 360 | |
350 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 20 | |
21 |
Strength to Weight: Bending, points | 19 | |
20 |
Thermal Diffusivity, mm2/s | 13 | |
11 |
Thermal Shock Resistance, points | 17 | |
17 |
Alloy Composition
Carbon (C), % | 0.43 to 0.48 | |
0.43 to 0.48 |
Chromium (Cr), % | 0.7 to 0.9 | |
0.8 to 1.1 |
Iron (Fe), % | 97.3 to 98 | |
96.7 to 97.7 |
Manganese (Mn), % | 0.7 to 0.9 | |
0.75 to 1.0 |
Molybdenum (Mo), % | 0 | |
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 |