S81921 Stainless Steel vs. Monel 400
S81921 stainless steel belongs to the iron alloys classification, while Monel 400 belongs to the nickel alloys. There are 30 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is S81921 stainless steel and the bottom bar is Monel 400.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 160 |
| Elongation at Break, % | 29 | |
| 20 to 40 |
| Fatigue Strength, MPa | 370 | |
| 230 to 290 |
| Poisson's Ratio | 0.28 | |
| 0.32 |
| Shear Modulus, GPa | 79 | |
| 62 |
| Shear Strength, MPa | 460 | |
| 370 to 490 |
| Tensile Strength: Ultimate (UTS), MPa | 710 | |
| 540 to 780 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 210 to 590 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 270 |
| Maximum Temperature: Mechanical, °C | 990 | |
| 1000 |
| Melting Completion (Liquidus), °C | 1430 | |
| 1350 |
| Melting Onset (Solidus), °C | 1390 | |
| 1300 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 430 |
| Thermal Conductivity, W/m-K | 15 | |
| 23 |
| Thermal Expansion, µm/m-K | 13 | |
| 14 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.2 | |
| 3.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.5 | |
| 3.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 14 | |
| 50 |
| Density, g/cm3 | 7.7 | |
| 8.9 |
| Embodied Carbon, kg CO2/kg material | 2.9 | |
| 7.9 |
| Embodied Energy, MJ/kg | 41 | |
| 110 |
| Embodied Water, L/kg | 150 | |
| 250 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 180 | |
| 140 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 630 | |
| 140 to 1080 |
| Stiffness to Weight: Axial, points | 14 | |
| 10 |
| Stiffness to Weight: Bending, points | 25 | |
| 21 |
| Strength to Weight: Axial, points | 25 | |
| 17 to 25 |
| Strength to Weight: Bending, points | 23 | |
| 17 to 21 |
| Thermal Diffusivity, mm2/s | 4.0 | |
| 6.1 |
| Thermal Shock Resistance, points | 20 | |
| 17 to 25 |
Alloy Composition
| Carbon (C), % | 0 to 0.030 | |
| 0 to 0.3 |
| Chromium (Cr), % | 19 to 22 | |
| 0 |
| Copper (Cu), % | 0 | |
| 28 to 34 |
| Iron (Fe), % | 66.7 to 75.9 | |
| 0 to 2.5 |
| Manganese (Mn), % | 2.0 to 4.0 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 1.0 to 2.0 | |
| 0 |
| Nickel (Ni), % | 2.0 to 4.0 | |
| 63 to 72 |
| Nitrogen (N), % | 0.14 to 0.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.024 |