S21904 Stainless Steel vs. AISI 304N Stainless Steel
Both S21904 stainless steel and AISI 304N 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 S21904 stainless steel and the bottom bar is AISI 304N stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 300 | |
| 190 to 360 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 17 to 51 | |
| 9.1 to 45 |
| Fatigue Strength, MPa | 380 to 550 | |
| 220 to 440 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 78 | |
| 77 |
| Shear Strength, MPa | 510 to 620 | |
| 420 to 700 |
| Tensile Strength: Ultimate (UTS), MPa | 700 to 1000 | |
| 620 to 1180 |
| Tensile Strength: Yield (Proof), MPa | 390 to 910 | |
| 270 to 850 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 430 | |
| 420 |
| Maximum Temperature: Mechanical, °C | 980 | |
| 960 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1420 |
| Melting Onset (Solidus), °C | 1350 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 14 | |
| 16 |
| Thermal Expansion, µm/m-K | 17 | |
| 16 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.5 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.9 | |
| 2.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 15 | |
| 15 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 3.0 | |
| 3.0 |
| Embodied Energy, MJ/kg | 43 | |
| 43 |
| Embodied Water, L/kg | 160 | |
| 150 |
Common Calculations
| PREN (Pitting Resistance) | 25 | |
| 21 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 160 to 310 | |
| 98 to 280 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 380 to 2070 | |
| 180 to 1830 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 25 to 36 | |
| 22 to 42 |
| Strength to Weight: Bending, points | 23 to 29 | |
| 21 to 32 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 4.2 |
| Thermal Shock Resistance, points | 15 to 21 | |
| 14 to 26 |
Alloy Composition
| Carbon (C), % | 0 to 0.040 | |
| 0 to 0.080 |
| Chromium (Cr), % | 19 to 21.5 | |
| 18 to 20 |
| Iron (Fe), % | 59.5 to 67.4 | |
| 66.4 to 73.9 |
| Manganese (Mn), % | 8.0 to 10 | |
| 0 to 2.0 |
| Nickel (Ni), % | 5.5 to 7.5 | |
| 8.0 to 10.5 |
| Nitrogen (N), % | 0.15 to 0.4 | |
| 0.1 to 0.16 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |