Annealed AISI 304LN vs. Annealed S21904 Stainless Steel
Both annealed AISI 304LN and annealed S21904 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a moderately high 91% of their average alloy composition in common.
For each property being compared, the top bar is annealed AISI 304LN and the bottom bar is annealed S21904 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 | |
| 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 42 | |
| 51 |
| Fatigue Strength, MPa | 200 | |
| 380 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Reduction in Area, % | 51 | |
| 64 |
| Rockwell B Hardness | 83 | |
| 86 |
| Shear Modulus, GPa | 77 | |
| 78 |
| Shear Strength, MPa | 400 | |
| 510 |
| Tensile Strength: Ultimate (UTS), MPa | 580 | |
| 700 |
| Tensile Strength: Yield (Proof), MPa | 230 | |
| 390 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 420 | |
| 430 |
| Maximum Temperature: Mechanical, °C | 960 | |
| 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 | 16 | |
| 15 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 3.1 | |
| 3.0 |
| Embodied Energy, MJ/kg | 44 | |
| 43 |
| Embodied Water, L/kg | 150 | |
| 160 |
Common Calculations
| PREN (Pitting Resistance) | 21 | |
| 25 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 310 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 | |
| 380 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 21 | |
| 25 |
| Strength to Weight: Bending, points | 20 | |
| 23 |
| Thermal Diffusivity, mm2/s | 4.0 | |
| 3.8 |
| Thermal Shock Resistance, points | 13 | |
| 15 |
Alloy Composition
| Carbon (C), % | 0 to 0.030 | |
| 0 to 0.040 |
| Chromium (Cr), % | 18 to 20 | |
| 19 to 21.5 |
| Iron (Fe), % | 65 to 73.9 | |
| 59.5 to 67.4 |
| Manganese (Mn), % | 0 to 2.0 | |
| 8.0 to 10 |
| Nickel (Ni), % | 8.0 to 12 | |
| 5.5 to 7.5 |
| Nitrogen (N), % | 0.1 to 0.16 | |
| 0.15 to 0.4 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 0.75 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |