S21904 Stainless Steel vs. Nickel 625
S21904 stainless steel belongs to the iron alloys classification, while nickel 625 belongs to the nickel alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is S21904 stainless steel and the bottom bar is nickel 625.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 17 to 51 | |
| 33 to 34 |
| Fatigue Strength, MPa | 380 to 550 | |
| 240 to 320 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 78 | |
| 79 |
| Shear Strength, MPa | 510 to 620 | |
| 530 to 600 |
| Tensile Strength: Ultimate (UTS), MPa | 700 to 1000 | |
| 790 to 910 |
| Tensile Strength: Yield (Proof), MPa | 390 to 910 | |
| 320 to 450 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 330 |
| Maximum Temperature: Mechanical, °C | 980 | |
| 980 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1350 |
| Melting Onset (Solidus), °C | 1350 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 440 |
| Thermal Conductivity, W/m-K | 14 | |
| 11 |
| Thermal Expansion, µm/m-K | 17 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.5 | |
| 1.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.9 | |
| 1.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 15 | |
| 80 |
| Density, g/cm3 | 7.7 | |
| 8.6 |
| Embodied Carbon, kg CO2/kg material | 3.0 | |
| 14 |
| Embodied Energy, MJ/kg | 43 | |
| 190 |
| Embodied Water, L/kg | 160 | |
| 290 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 160 to 310 | |
| 220 to 250 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 380 to 2070 | |
| 260 to 490 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 23 |
| Strength to Weight: Axial, points | 25 to 36 | |
| 26 to 29 |
| Strength to Weight: Bending, points | 23 to 29 | |
| 22 to 24 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 2.9 |
| Thermal Shock Resistance, points | 15 to 21 | |
| 22 to 25 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.4 |
| Carbon (C), % | 0 to 0.040 | |
| 0 to 0.1 |
| Chromium (Cr), % | 19 to 21.5 | |
| 20 to 23 |
| Cobalt (Co), % | 0 | |
| 0 to 1.0 |
| Iron (Fe), % | 59.5 to 67.4 | |
| 0 to 5.0 |
| Manganese (Mn), % | 8.0 to 10 | |
| 0 to 0.5 |
| Molybdenum (Mo), % | 0 | |
| 8.0 to 10 |
| Nickel (Ni), % | 5.5 to 7.5 | |
| 58 to 68.9 |
| Niobium (Nb), % | 0 | |
| 3.2 to 4.2 |
| Nitrogen (N), % | 0.15 to 0.4 | |
| 0 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.015 |
| Titanium (Ti), % | 0 | |
| 0 to 0.4 |