S31730 Stainless Steel vs. AISI 321 Stainless Steel
Both S31730 stainless steel and AISI 321 stainless steel are iron alloys. They have 87% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is S31730 stainless steel and the bottom bar is AISI 321 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 180 | |
| 170 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 40 | |
| 34 to 50 |
| Fatigue Strength, MPa | 170 | |
| 220 to 270 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 77 |
| Shear Strength, MPa | 370 | |
| 420 to 460 |
| Tensile Strength: Ultimate (UTS), MPa | 540 | |
| 590 to 690 |
| Tensile Strength: Yield (Proof), MPa | 200 | |
| 220 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 420 | |
| 480 |
| Maximum Temperature: Mechanical, °C | 990 | |
| 870 |
| Melting Completion (Liquidus), °C | 1430 | |
| 1430 |
| Melting Onset (Solidus), °C | 1390 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Expansion, µm/m-K | 16 | |
| 17 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 24 | |
| 16 |
| Density, g/cm3 | 8.0 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 4.6 | |
| 3.2 |
| Embodied Energy, MJ/kg | 63 | |
| 45 |
| Embodied Water, L/kg | 180 | |
| 140 |
Common Calculations
| PREN (Pitting Resistance) | 30 | |
| 19 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 170 | |
| 190 to 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 99 | |
| 130 to 310 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 19 | |
| 21 to 25 |
| Strength to Weight: Bending, points | 18 | |
| 20 to 22 |
| Thermal Shock Resistance, points | 12 | |
| 13 to 15 |
Alloy Composition
| Carbon (C), % | 0 to 0.030 | |
| 0 to 0.080 |
| Chromium (Cr), % | 17 to 19 | |
| 17 to 19 |
| Copper (Cu), % | 4.0 to 5.0 | |
| 0 |
| Iron (Fe), % | 52.4 to 61 | |
| 65.3 to 74 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 3.0 to 4.0 | |
| 0 |
| Nickel (Ni), % | 15 to 16.5 | |
| 9.0 to 12 |
| Nitrogen (N), % | 0 to 0.045 | |
| 0 to 0.1 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 | |
| 0 to 0.7 |