S21904 Stainless Steel vs. SAE-AISI 8620 Steel
Both S21904 stainless steel and SAE-AISI 8620 steel are iron alloys. They have 66% of their average alloy composition in common. 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 S21904 stainless steel and the bottom bar is SAE-AISI 8620 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 300 | |
| 150 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 17 to 51 | |
| 13 to 31 |
| Fatigue Strength, MPa | 380 to 550 | |
| 270 to 360 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 78 | |
| 73 |
| Shear Strength, MPa | 510 to 620 | |
| 340 to 420 |
| Tensile Strength: Ultimate (UTS), MPa | 700 to 1000 | |
| 520 to 690 |
| Tensile Strength: Yield (Proof), MPa | 390 to 910 | |
| 360 to 570 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 980 | |
| 410 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1460 |
| Melting Onset (Solidus), °C | 1350 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 14 | |
| 39 |
| Thermal Expansion, µm/m-K | 17 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.5 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.9 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 15 | |
| 2.6 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 3.0 | |
| 1.5 |
| Embodied Energy, MJ/kg | 43 | |
| 20 |
| Embodied Water, L/kg | 160 | |
| 50 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 160 to 310 | |
| 86 to 150 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 380 to 2070 | |
| 340 to 880 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 25 to 36 | |
| 18 to 24 |
| Strength to Weight: Bending, points | 23 to 29 | |
| 18 to 22 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 10 |
| Thermal Shock Resistance, points | 15 to 21 | |
| 15 to 20 |
Alloy Composition
| Carbon (C), % | 0 to 0.040 | |
| 0.18 to 0.23 |
| Chromium (Cr), % | 19 to 21.5 | |
| 0.4 to 0.6 |
| Iron (Fe), % | 59.5 to 67.4 | |
| 96.9 to 98 |
| Manganese (Mn), % | 8.0 to 10 | |
| 0.7 to 0.9 |
| Molybdenum (Mo), % | 0 | |
| 0.15 to 0.25 |
| Nickel (Ni), % | 5.5 to 7.5 | |
| 0.4 to 0.7 |
| Nitrogen (N), % | 0.15 to 0.4 | |
| 0 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 1.0 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.040 |