S21900 Stainless Steel vs. Type 4 Magnetic Alloy
S21900 stainless steel belongs to the iron alloys classification, while 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 (7, in this case) are not shown.
For each property being compared, the top bar is S21900 stainless steel and the bottom bar is Type 4 magnetic alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 50 | |
| 2.0 to 40 |
| Fatigue Strength, MPa | 380 | |
| 220 to 400 |
| Poisson's Ratio | 0.28 | |
| 0.31 |
| Shear Modulus, GPa | 78 | |
| 73 |
| Shear Strength, MPa | 510 | |
| 420 to 630 |
| Tensile Strength: Ultimate (UTS), MPa | 710 | |
| 620 to 1100 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 270 to 1040 |
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 | 300 | |
| 22 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 380 | |
| 190 to 2840 |
| Stiffness to Weight: Axial, points | 14 | |
| 12 |
| Stiffness to Weight: Bending, points | 25 | |
| 22 |
| Strength to Weight: Axial, points | 26 | |
| 19 to 35 |
| Strength to Weight: Bending, points | 23 | |
| 18 to 27 |
| Thermal Shock Resistance, points | 15 | |
| 21 to 37 |
Alloy Composition
| Carbon (C), % | 0 to 0.080 | |
| 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), % | 59.4 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 |