Annealed SAE-AISI P20 vs. Annealed SAE-AISI P4
Both annealed SAE-AISI P20 and annealed SAE-AISI P4 are iron alloys. Both are furnished in the annealed condition. They have a very high 96% of their average alloy composition in common.
For each property being compared, the top bar is annealed SAE-AISI P20 and the bottom bar is annealed SAE-AISI P4.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 160 | |
| 120 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 23 | |
| 21 |
| Fatigue Strength, MPa | 210 | |
| 130 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 74 |
| Shear Strength, MPa | 340 | |
| 240 |
| Tensile Strength: Ultimate (UTS), MPa | 540 | |
| 390 |
| Tensile Strength: Yield (Proof), MPa | 290 | |
| 190 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 260 |
| 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 | 45 | |
| 41 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 8.1 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.5 | |
| 9.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.8 | |
| 4.4 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.6 | |
| 1.8 |
| Embodied Energy, MJ/kg | 21 | |
| 23 |
| Embodied Water, L/kg | 52 | |
| 68 |
Common Calculations
| PREN (Pitting Resistance) | 2.6 | |
| 7.0 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 100 | |
| 67 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 230 | |
| 94 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 19 | |
| 14 |
| Strength to Weight: Bending, points | 19 | |
| 15 |
| Thermal Diffusivity, mm2/s | 12 | |
| 11 |
| Thermal Shock Resistance, points | 18 | |
| 13 |
Alloy Composition
| Carbon (C), % | 0.28 to 0.4 | |
| 0 to 0.12 |
| Chromium (Cr), % | 0.4 to 2.0 | |
| 4.0 to 5.3 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 to 0.25 |
| Iron (Fe), % | 95.2 to 98.5 | |
| 92.3 to 95.3 |
| Manganese (Mn), % | 0.35 to 0.71 | |
| 0.2 to 0.6 |
| Molybdenum (Mo), % | 0.3 to 0.55 | |
| 0.4 to 1.0 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.030 |
| Silicon (Si), % | 0.2 to 0.8 | |
| 0.1 to 0.4 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |