EN 1.4371 Stainless Steel vs. AISI 321 Stainless Steel
Both EN 1.4371 stainless steel and AISI 321 stainless steel are iron alloys. They have a moderately high 92% of their average alloy composition in common.
For each property being compared, the top bar is EN 1.4371 stainless steel and the bottom bar is AISI 321 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 to 230 | |
| 170 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 45 to 51 | |
| 34 to 50 |
| Fatigue Strength, MPa | 290 to 340 | |
| 220 to 270 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 77 |
| Shear Strength, MPa | 520 to 540 | |
| 420 to 460 |
| Tensile Strength: Ultimate (UTS), MPa | 740 to 750 | |
| 590 to 690 |
| Tensile Strength: Yield (Proof), MPa | 320 to 340 | |
| 220 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 410 | |
| 480 |
| Maximum Temperature: Mechanical, °C | 880 | |
| 870 |
| Melting Completion (Liquidus), °C | 1410 | |
| 1430 |
| Melting Onset (Solidus), °C | 1370 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 15 | |
| 16 |
| Thermal Expansion, µm/m-K | 17 | |
| 17 |
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 | 12 | |
| 16 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 3.2 |
| Embodied Energy, MJ/kg | 38 | |
| 45 |
| Embodied Water, L/kg | 140 | |
| 140 |
Common Calculations
| PREN (Pitting Resistance) | 20 | |
| 19 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 270 to 310 | |
| 190 to 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 250 to 300 | |
| 130 to 310 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 27 | |
| 21 to 25 |
| Strength to Weight: Bending, points | 24 | |
| 20 to 22 |
| Thermal Diffusivity, mm2/s | 4.0 | |
| 4.1 |
| Thermal Shock Resistance, points | 16 | |
| 13 to 15 |
Alloy Composition
| Carbon (C), % | 0 to 0.030 | |
| 0 to 0.080 |
| Chromium (Cr), % | 16 to 17.5 | |
| 17 to 19 |
| Copper (Cu), % | 0 to 1.0 | |
| 0 |
| Iron (Fe), % | 66.7 to 74.4 | |
| 65.3 to 74 |
| Manganese (Mn), % | 6.0 to 8.0 | |
| 0 to 2.0 |
| Nickel (Ni), % | 3.5 to 5.5 | |
| 9.0 to 12 |
| Nitrogen (N), % | 0.15 to 0.25 | |
| 0 to 0.1 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 | |
| 0 to 0.7 |