AISI 204 Stainless Steel vs. S21904 Stainless Steel
Both AISI 204 stainless steel and S21904 stainless steel are iron alloys. They have a moderately high 90% of their average alloy composition in common.
For each property being compared, the top bar is AISI 204 stainless steel and the bottom bar is S21904 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 330 | |
| 210 to 300 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 23 to 39 | |
| 17 to 51 |
| Fatigue Strength, MPa | 320 to 720 | |
| 380 to 550 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 78 |
| Shear Strength, MPa | 500 to 700 | |
| 510 to 620 |
| Tensile Strength: Ultimate (UTS), MPa | 730 to 1100 | |
| 700 to 1000 |
| Tensile Strength: Yield (Proof), MPa | 380 to 1080 | |
| 390 to 910 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 410 | |
| 430 |
| Maximum Temperature: Mechanical, °C | 850 | |
| 980 |
| Melting Completion (Liquidus), °C | 1410 | |
| 1400 |
| Melting Onset (Solidus), °C | 1370 | |
| 1350 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 15 | |
| 14 |
| Thermal Expansion, µm/m-K | 17 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.4 | |
| 2.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.9 | |
| 2.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 10 | |
| 15 |
| Density, g/cm3 | 7.7 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 2.4 | |
| 3.0 |
| Embodied Energy, MJ/kg | 35 | |
| 43 |
| Embodied Water, L/kg | 130 | |
| 160 |
Common Calculations
| PREN (Pitting Resistance) | 20 | |
| 25 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 240 to 250 | |
| 160 to 310 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 360 to 2940 | |
| 380 to 2070 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 27 to 40 | |
| 25 to 36 |
| Strength to Weight: Bending, points | 24 to 31 | |
| 23 to 29 |
| Thermal Diffusivity, mm2/s | 4.1 | |
| 3.8 |
| Thermal Shock Resistance, points | 16 to 24 | |
| 15 to 21 |
Alloy Composition
| Carbon (C), % | 0 to 0.030 | |
| 0 to 0.040 |
| Chromium (Cr), % | 15 to 17 | |
| 19 to 21.5 |
| Iron (Fe), % | 69.6 to 76.4 | |
| 59.5 to 67.4 |
| Manganese (Mn), % | 7.0 to 9.0 | |
| 8.0 to 10 |
| Nickel (Ni), % | 1.5 to 3.0 | |
| 5.5 to 7.5 |
| Nitrogen (N), % | 0.15 to 0.3 | |
| 0.15 to 0.4 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |