AISI 316N Stainless Steel vs. AISI 321 Stainless Steel
Both AISI 316N stainless steel and AISI 321 stainless steel are iron alloys. They have a very high 96% of their average alloy composition in common.
For each property being compared, the top bar is AISI 316N stainless steel and the bottom bar is AISI 321 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 to 350 | |
| 170 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 9.0 to 39 | |
| 34 to 50 |
| Fatigue Strength, MPa | 230 to 450 | |
| 220 to 270 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 78 | |
| 77 |
| Shear Strength, MPa | 420 to 690 | |
| 420 to 460 |
| Tensile Strength: Ultimate (UTS), MPa | 620 to 1160 | |
| 590 to 690 |
| Tensile Strength: Yield (Proof), MPa | 270 to 870 | |
| 220 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 410 | |
| 480 |
| Maximum Temperature: Mechanical, °C | 940 | |
| 870 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1430 |
| Melting Onset (Solidus), °C | 1400 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 15 | |
| 16 |
| Thermal Expansion, µm/m-K | 16 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.3 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.7 | |
| 2.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 19 | |
| 16 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 3.9 | |
| 3.2 |
| Embodied Energy, MJ/kg | 53 | |
| 45 |
| Embodied Water, L/kg | 150 | |
| 140 |
Common Calculations
| PREN (Pitting Resistance) | 27 | |
| 19 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 95 to 230 | |
| 190 to 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 180 to 1880 | |
| 130 to 310 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 22 to 41 | |
| 21 to 25 |
| Strength to Weight: Bending, points | 20 to 31 | |
| 20 to 22 |
| Thermal Diffusivity, mm2/s | 4.1 | |
| 4.1 |
| Thermal Shock Resistance, points | 14 to 26 | |
| 13 to 15 |
Alloy Composition
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.080 |
| Chromium (Cr), % | 16 to 18 | |
| 17 to 19 |
| Iron (Fe), % | 61.9 to 71.9 | |
| 65.3 to 74 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 2.0 to 3.0 | |
| 0 |
| Nickel (Ni), % | 10 to 14 | |
| 9.0 to 12 |
| Nitrogen (N), % | 0.1 to 0.16 | |
| 0 to 0.1 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 0.75 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 | |
| 0 to 0.7 |