AISI 440A Stainless Steel vs. S21800 Stainless Steel
Both AISI 440A stainless steel and S21800 stainless steel are iron alloys. They have 80% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is AISI 440A stainless steel and the bottom bar is S21800 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 5.0 to 20 | |
| 40 |
| Fatigue Strength, MPa | 270 to 790 | |
| 330 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 75 |
| Shear Strength, MPa | 450 to 1040 | |
| 510 |
| Tensile Strength: Ultimate (UTS), MPa | 730 to 1790 | |
| 740 |
| Tensile Strength: Yield (Proof), MPa | 420 to 1650 | |
| 390 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 340 |
| Maximum Temperature: Corrosion, °C | 400 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 760 | |
| 900 |
| Melting Completion (Liquidus), °C | 1480 | |
| 1360 |
| Melting Onset (Solidus), °C | 1370 | |
| 1310 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 500 |
| Thermal Expansion, µm/m-K | 10 | |
| 16 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.0 | |
| 15 |
| Density, g/cm3 | 7.7 | |
| 7.5 |
| Embodied Carbon, kg CO2/kg material | 2.2 | |
| 3.1 |
| Embodied Energy, MJ/kg | 31 | |
| 45 |
| Embodied Water, L/kg | 120 | |
| 150 |
Common Calculations
| PREN (Pitting Resistance) | 18 | |
| 19 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 87 to 120 | |
| 250 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 26 |
| Strength to Weight: Axial, points | 26 to 65 | |
| 27 |
| Strength to Weight: Bending, points | 23 to 43 | |
| 24 |
| Thermal Shock Resistance, points | 26 to 65 | |
| 17 |
Alloy Composition
| Carbon (C), % | 0.6 to 0.75 | |
| 0 to 0.1 |
| Chromium (Cr), % | 16 to 18 | |
| 16 to 18 |
| Iron (Fe), % | 78.4 to 83.4 | |
| 59.1 to 65.4 |
| Manganese (Mn), % | 0 to 1.0 | |
| 7.0 to 9.0 |
| Molybdenum (Mo), % | 0 to 0.75 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 8.0 to 9.0 |
| Nitrogen (N), % | 0 | |
| 0.080 to 0.18 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.060 |
| Silicon (Si), % | 0 to 1.0 | |
| 3.5 to 4.5 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |