S21904 Stainless Steel vs. AISI 304LN Stainless Steel
Both S21904 stainless steel and AISI 304LN 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 304LN stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 300 | |
| 190 to 350 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 17 to 51 | |
| 7.8 to 46 |
| Fatigue Strength, MPa | 380 to 550 | |
| 200 to 440 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 78 | |
| 77 |
| Shear Strength, MPa | 510 to 620 | |
| 400 to 680 |
| Tensile Strength: Ultimate (UTS), MPa | 700 to 1000 | |
| 580 to 1160 |
| Tensile Strength: Yield (Proof), MPa | 390 to 910 | |
| 230 to 870 |
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 | |
| 15 |
| 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 | |
| 16 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 3.0 | |
| 3.1 |
| Embodied Energy, MJ/kg | 43 | |
| 44 |
| Embodied Water, L/kg | 160 | |
| 150 |
Common Calculations
| PREN (Pitting Resistance) | 25 | |
| 21 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 160 to 310 | |
| 83 to 270 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 380 to 2070 | |
| 140 to 1900 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 25 to 36 | |
| 21 to 41 |
| Strength to Weight: Bending, points | 23 to 29 | |
| 20 to 31 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 4.0 |
| Thermal Shock Resistance, points | 15 to 21 | |
| 13 to 26 |
Alloy Composition
| Carbon (C), % | 0 to 0.040 | |
| 0 to 0.030 |
| Chromium (Cr), % | 19 to 21.5 | |
| 18 to 20 |
| Iron (Fe), % | 59.5 to 67.4 | |
| 65 to 73.9 |
| Manganese (Mn), % | 8.0 to 10 | |
| 0 to 2.0 |
| Nickel (Ni), % | 5.5 to 7.5 | |
| 8.0 to 12 |
| 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 |