AISI 304 Stainless Steel vs. AISI 420 Stainless Steel
Both AISI 304 stainless steel and AISI 420 stainless steel are iron alloys. They have 85% of their average alloy composition in common. There are 33 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 AISI 304 stainless steel and the bottom bar is AISI 420 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 170 to 360 | |
| 190 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 8.0 to 43 | |
| 8.0 to 15 |
| Fatigue Strength, MPa | 210 to 440 | |
| 220 to 670 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 76 |
| Shear Strength, MPa | 400 to 690 | |
| 420 to 1010 |
| Tensile Strength: Ultimate (UTS), MPa | 580 to 1180 | |
| 690 to 1720 |
| Tensile Strength: Yield (Proof), MPa | 230 to 860 | |
| 380 to 1310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 280 |
| Maximum Temperature: Corrosion, °C | 420 | |
| 390 |
| Maximum Temperature: Mechanical, °C | 710 | |
| 620 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1510 |
| Melting Onset (Solidus), °C | 1400 | |
| 1450 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 16 | |
| 27 |
| Thermal Expansion, µm/m-K | 17 | |
| 10 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.4 | |
| 3.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.7 | |
| 3.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 15 | |
| 7.5 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 3.0 | |
| 2.0 |
| Embodied Energy, MJ/kg | 43 | |
| 28 |
| Embodied Water, L/kg | 150 | |
| 100 |
Common Calculations
| PREN (Pitting Resistance) | 20 | |
| 14 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 86 to 250 | |
| 88 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 to 1870 | |
| 380 to 4410 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 21 to 42 | |
| 25 to 62 |
| Strength to Weight: Bending, points | 20 to 32 | |
| 22 to 41 |
| Thermal Diffusivity, mm2/s | 4.2 | |
| 7.3 |
| Thermal Shock Resistance, points | 12 to 25 | |
| 25 to 62 |
Alloy Composition
| Carbon (C), % | 0 to 0.080 | |
| 0.15 to 0.4 |
| Chromium (Cr), % | 18 to 20 | |
| 12 to 14 |
| Iron (Fe), % | 66.5 to 74 | |
| 82.3 to 87.9 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 0 to 0.5 |
| Nickel (Ni), % | 8.0 to 10.5 | |
| 0 to 0.75 |
| Nitrogen (N), % | 0 to 0.1 | |
| 0 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.75 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |