EN 1.4640 Stainless Steel vs. S21904 Stainless Steel
Both EN 1.4640 stainless steel and S21904 stainless steel are iron alloys. They have a moderately high 91% of their average alloy composition in common.
For each property being compared, the top bar is EN 1.4640 stainless steel and the bottom bar is S21904 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 to 200 | |
| 210 to 300 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 51 | |
| 17 to 51 |
| Fatigue Strength, MPa | 230 to 250 | |
| 380 to 550 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 78 |
| Shear Strength, MPa | 440 to 460 | |
| 510 to 620 |
| Tensile Strength: Ultimate (UTS), MPa | 620 to 650 | |
| 700 to 1000 |
| Tensile Strength: Yield (Proof), MPa | 240 to 260 | |
| 390 to 910 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 420 | |
| 430 |
| Maximum Temperature: Mechanical, °C | 930 | |
| 980 |
| Melting Completion (Liquidus), °C | 1420 | |
| 1400 |
| Melting Onset (Solidus), °C | 1380 | |
| 1350 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 15 | |
| 14 |
| Thermal Expansion, µm/m-K | 16 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.4 | |
| 2.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.7 | |
| 2.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 14 | |
| 15 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 2.8 | |
| 3.0 |
| Embodied Energy, MJ/kg | 40 | |
| 43 |
| Embodied Water, L/kg | 150 | |
| 160 |
Common Calculations
| PREN (Pitting Resistance) | 20 | |
| 25 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 250 to 260 | |
| 160 to 310 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 150 to 170 | |
| 380 to 2070 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 22 to 23 | |
| 25 to 36 |
| Strength to Weight: Bending, points | 21 | |
| 23 to 29 |
| Thermal Diffusivity, mm2/s | 4.0 | |
| 3.8 |
| Thermal Shock Resistance, points | 14 to 15 | |
| 15 to 21 |
Alloy Composition
| Carbon (C), % | 0.030 to 0.080 | |
| 0 to 0.040 |
| Chromium (Cr), % | 18 to 19 | |
| 19 to 21.5 |
| Copper (Cu), % | 1.3 to 2.0 | |
| 0 |
| Iron (Fe), % | 67.4 to 73.6 | |
| 59.5 to 67.4 |
| Manganese (Mn), % | 1.5 to 4.0 | |
| 8.0 to 10 |
| Nickel (Ni), % | 5.5 to 6.9 | |
| 5.5 to 7.5 |
| Nitrogen (N), % | 0.030 to 0.11 | |
| 0.15 to 0.4 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |