SAE-AISI D2 Steel vs. S21904 Stainless Steel
Both SAE-AISI D2 steel and S21904 stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI D2 steel and the bottom bar is S21904 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 5.0 to 16 | |
| 17 to 51 |
| Fatigue Strength, MPa | 310 to 860 | |
| 380 to 550 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 75 | |
| 78 |
| Shear Strength, MPa | 460 to 1160 | |
| 510 to 620 |
| Tensile Strength: Ultimate (UTS), MPa | 760 to 2000 | |
| 700 to 1000 |
| Tensile Strength: Yield (Proof), MPa | 470 to 1510 | |
| 390 to 910 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 290 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1400 |
| Melting Onset (Solidus), °C | 1390 | |
| 1350 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 31 | |
| 14 |
| Thermal Expansion, µm/m-K | 11 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 4.3 | |
| 2.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 5.1 | |
| 2.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 8.0 | |
| 15 |
| Density, g/cm3 | 7.7 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 3.4 | |
| 3.0 |
| Embodied Energy, MJ/kg | 50 | |
| 43 |
| Embodied Water, L/kg | 100 | |
| 160 |
Common Calculations
| PREN (Pitting Resistance) | 15 | |
| 25 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 92 to 100 | |
| 160 to 310 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 to 5940 | |
| 380 to 2070 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 27 to 72 | |
| 25 to 36 |
| Strength to Weight: Bending, points | 24 to 46 | |
| 23 to 29 |
| Thermal Diffusivity, mm2/s | 8.3 | |
| 3.8 |
| Thermal Shock Resistance, points | 25 to 67 | |
| 15 to 21 |
Alloy Composition
| Carbon (C), % | 1.4 to 1.6 | |
| 0 to 0.040 |
| Chromium (Cr), % | 11 to 13 | |
| 19 to 21.5 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 |
| Iron (Fe), % | 81.3 to 86.9 | |
| 59.5 to 67.4 |
| Manganese (Mn), % | 0 to 0.6 | |
| 8.0 to 10 |
| Molybdenum (Mo), % | 0.7 to 1.2 | |
| 0 |
| Nickel (Ni), % | 0 to 0.3 | |
| 5.5 to 7.5 |
| Nitrogen (N), % | 0 | |
| 0.15 to 0.4 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 0.6 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Vanadium (V), % | 0 to 1.1 | |
| 0 |