Annealed SAE-AISI D4 vs. Annealed SAE-AISI P4
Both annealed SAE-AISI D4 and annealed SAE-AISI P4 are iron alloys. Both are furnished in the annealed condition. They have 90% of their average alloy composition in common.
For each property being compared, the top bar is annealed SAE-AISI D4 and the bottom bar is annealed SAE-AISI P4.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 230 | |
| 120 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 15 | |
| 21 |
| Fatigue Strength, MPa | 310 | |
| 130 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 74 | |
| 74 |
| Shear Strength, MPa | 460 | |
| 240 |
| Tensile Strength: Ultimate (UTS), MPa | 760 | |
| 390 |
| Tensile Strength: Yield (Proof), MPa | 470 | |
| 190 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 260 |
| Melting Completion (Liquidus), °C | 1430 | |
| 1460 |
| Melting Onset (Solidus), °C | 1380 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 31 | |
| 41 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 4.2 | |
| 8.1 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 5.0 | |
| 9.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 8.0 | |
| 4.4 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 3.3 | |
| 1.8 |
| Embodied Energy, MJ/kg | 49 | |
| 23 |
| Embodied Water, L/kg | 100 | |
| 68 |
Common Calculations
| PREN (Pitting Resistance) | 15 | |
| 7.0 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 100 | |
| 67 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 | |
| 94 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 27 | |
| 14 |
| Strength to Weight: Bending, points | 24 | |
| 15 |
| Thermal Diffusivity, mm2/s | 8.3 | |
| 11 |
| Thermal Shock Resistance, points | 23 | |
| 13 |
Alloy Composition
| Carbon (C), % | 2.1 to 2.4 | |
| 0 to 0.12 |
| Chromium (Cr), % | 11 to 13 | |
| 4.0 to 5.3 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 to 0.25 |
| Iron (Fe), % | 80.6 to 86.3 | |
| 92.3 to 95.3 |
| Manganese (Mn), % | 0 to 0.6 | |
| 0.2 to 0.6 |
| Molybdenum (Mo), % | 0.7 to 1.2 | |
| 0.4 to 1.0 |
| Nickel (Ni), % | 0 to 0.3 | |
| 0 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.6 | |
| 0.1 to 0.4 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Vanadium (V), % | 0 to 1.0 | |
| 0 |