S21904 Stainless Steel vs. AISI 420 Stainless Steel
Both S21904 stainless steel and AISI 420 stainless steel are iron alloys. They have 78% of their average alloy composition in common. There are 33 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.
For each property being compared, the top bar is S21904 stainless steel and the bottom bar is AISI 420 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 300 | |
| 190 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 17 to 51 | |
| 8.0 to 15 |
| Fatigue Strength, MPa | 380 to 550 | |
| 220 to 670 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 78 | |
| 76 |
| Shear Strength, MPa | 510 to 620 | |
| 420 to 1010 |
| Tensile Strength: Ultimate (UTS), MPa | 700 to 1000 | |
| 690 to 1720 |
| Tensile Strength: Yield (Proof), MPa | 390 to 910 | |
| 380 to 1310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 280 |
| Maximum Temperature: Corrosion, °C | 430 | |
| 390 |
| Maximum Temperature: Mechanical, °C | 980 | |
| 620 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1510 |
| Melting Onset (Solidus), °C | 1350 | |
| 1450 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 14 | |
| 27 |
| Thermal Expansion, µm/m-K | 17 | |
| 10 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.5 | |
| 3.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.9 | |
| 3.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 15 | |
| 7.5 |
| Density, g/cm3 | 7.7 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 3.0 | |
| 2.0 |
| Embodied Energy, MJ/kg | 43 | |
| 28 |
| Embodied Water, L/kg | 160 | |
| 100 |
Common Calculations
| PREN (Pitting Resistance) | 25 | |
| 14 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 160 to 310 | |
| 88 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 380 to 2070 | |
| 380 to 4410 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 25 to 36 | |
| 25 to 62 |
| Strength to Weight: Bending, points | 23 to 29 | |
| 22 to 41 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 7.3 |
| Thermal Shock Resistance, points | 15 to 21 | |
| 25 to 62 |
Alloy Composition
| Carbon (C), % | 0 to 0.040 | |
| 0.15 to 0.4 |
| Chromium (Cr), % | 19 to 21.5 | |
| 12 to 14 |
| Iron (Fe), % | 59.5 to 67.4 | |
| 82.3 to 87.9 |
| Manganese (Mn), % | 8.0 to 10 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 0 to 0.5 |
| Nickel (Ni), % | 5.5 to 7.5 | |
| 0 to 0.75 |
| Nitrogen (N), % | 0.15 to 0.4 | |
| 0 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |