Nickel 690 vs. S21904 Stainless Steel
Nickel 690 belongs to the nickel alloys classification, while S21904 stainless steel belongs to the iron alloys. They have a modest 36% of their average alloy composition in common, which, by itself, doesn't mean much. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is nickel 690 and the bottom bar is S21904 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 90 | |
| 210 to 300 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 3.4 to 34 | |
| 17 to 51 |
| Fatigue Strength, MPa | 180 to 300 | |
| 380 to 550 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 79 | |
| 78 |
| Shear Strength, MPa | 420 to 570 | |
| 510 to 620 |
| Tensile Strength: Ultimate (UTS), MPa | 640 to 990 | |
| 700 to 1000 |
| Tensile Strength: Yield (Proof), MPa | 250 to 760 | |
| 390 to 910 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 1010 | |
| 980 |
| Melting Completion (Liquidus), °C | 1380 | |
| 1400 |
| Melting Onset (Solidus), °C | 1340 | |
| 1350 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 14 | |
| 14 |
| Thermal Expansion, µm/m-K | 14 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.5 | |
| 2.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 1.6 | |
| 2.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 50 | |
| 15 |
| Density, g/cm3 | 8.3 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 3.0 |
| Embodied Energy, MJ/kg | 120 | |
| 43 |
| Embodied Water, L/kg | 290 | |
| 160 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 31 to 170 | |
| 160 to 310 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 160 to 1440 | |
| 380 to 2070 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 21 to 33 | |
| 25 to 36 |
| Strength to Weight: Bending, points | 20 to 27 | |
| 23 to 29 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 3.8 |
| Thermal Shock Resistance, points | 16 to 25 | |
| 15 to 21 |
Alloy Composition
| Carbon (C), % | 0 to 0.050 | |
| 0 to 0.040 |
| Chromium (Cr), % | 27 to 31 | |
| 19 to 21.5 |
| Copper (Cu), % | 0 to 0.5 | |
| 0 |
| Iron (Fe), % | 7.0 to 11 | |
| 59.5 to 67.4 |
| Manganese (Mn), % | 0 to 0.5 | |
| 8.0 to 10 |
| Nickel (Ni), % | 58 to 66 | |
| 5.5 to 7.5 |
| Nitrogen (N), % | 0 | |
| 0.15 to 0.4 |
| Phosphorus (P), % | 0 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |