Annealed S21904 Stainless Steel vs. Annealed Type 4 Magnetic Alloy
Annealed S21904 stainless steel belongs to the iron alloys classification, while annealed Type 4 magnetic alloy belongs to the nickel alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 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 annealed S21904 stainless steel and the bottom bar is annealed Type 4 magnetic alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 51 | |
| 40 |
| Fatigue Strength, MPa | 380 | |
| 220 |
| Poisson's Ratio | 0.28 | |
| 0.31 |
| Shear Modulus, GPa | 78 | |
| 73 |
| Shear Strength, MPa | 510 | |
| 420 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 620 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 270 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 980 | |
| 900 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1420 |
| Melting Onset (Solidus), °C | 1350 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 440 |
| Thermal Expansion, µm/m-K | 17 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.5 | |
| 2.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.9 | |
| 3.0 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 15 | |
| 60 |
| Density, g/cm3 | 7.7 | |
| 8.8 |
| Embodied Carbon, kg CO2/kg material | 3.0 | |
| 10 |
| Embodied Energy, MJ/kg | 43 | |
| 140 |
| Embodied Water, L/kg | 160 | |
| 210 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 310 | |
| 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 380 | |
| 190 |
| Stiffness to Weight: Axial, points | 14 | |
| 12 |
| Stiffness to Weight: Bending, points | 25 | |
| 22 |
| Strength to Weight: Axial, points | 25 | |
| 19 |
| Strength to Weight: Bending, points | 23 | |
| 18 |
| Thermal Shock Resistance, points | 15 | |
| 21 |
Alloy Composition
| Carbon (C), % | 0 to 0.040 | |
| 0 to 0.050 |
| Chromium (Cr), % | 19 to 21.5 | |
| 0 to 0.3 |
| Cobalt (Co), % | 0 | |
| 0 to 0.5 |
| Copper (Cu), % | 0 | |
| 0 to 0.3 |
| Iron (Fe), % | 59.5 to 67.4 | |
| 9.5 to 17.5 |
| Manganese (Mn), % | 8.0 to 10 | |
| 0 to 0.8 |
| Molybdenum (Mo), % | 0 | |
| 3.5 to 6.0 |
| Nickel (Ni), % | 5.5 to 7.5 | |
| 79 to 82 |
| Nitrogen (N), % | 0.15 to 0.4 | |
| 0 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.010 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.020 |