AISI 440B Stainless Steel vs. AISI 420 Stainless Steel
Both AISI 440B stainless steel and AISI 420 stainless steel are iron alloys. They have a very high 95% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is AISI 440B stainless steel and the bottom bar is AISI 420 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 3.0 to 18 | |
| 8.0 to 15 |
| Fatigue Strength, MPa | 260 to 850 | |
| 220 to 670 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 76 |
| Shear Strength, MPa | 460 to 1110 | |
| 420 to 1010 |
| Tensile Strength: Ultimate (UTS), MPa | 740 to 1930 | |
| 690 to 1720 |
| Tensile Strength: Yield (Proof), MPa | 430 to 1860 | |
| 380 to 1310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 280 |
| Maximum Temperature: Corrosion, °C | 390 | |
| 390 |
| Maximum Temperature: Mechanical, °C | 870 | |
| 620 |
| Melting Completion (Liquidus), °C | 1480 | |
| 1510 |
| Melting Onset (Solidus), °C | 1370 | |
| 1450 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 23 | |
| 27 |
| Thermal Expansion, µm/m-K | 10 | |
| 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 | 9.0 | |
| 7.5 |
| Density, g/cm3 | 7.7 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 2.2 | |
| 2.0 |
| Embodied Energy, MJ/kg | 31 | |
| 28 |
| Embodied Water, L/kg | 120 | |
| 100 |
Common Calculations
| PREN (Pitting Resistance) | 18 | |
| 14 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 to 110 | |
| 88 to 130 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 27 to 70 | |
| 25 to 62 |
| Strength to Weight: Bending, points | 24 to 45 | |
| 22 to 41 |
| Thermal Diffusivity, mm2/s | 6.1 | |
| 7.3 |
| Thermal Shock Resistance, points | 27 to 70 | |
| 25 to 62 |
Alloy Composition
| Carbon (C), % | 0.75 to 1.0 | |
| 0.15 to 0.4 |
| Chromium (Cr), % | 16 to 18 | |
| 12 to 14 |
| Iron (Fe), % | 78.2 to 83.3 | |
| 82.3 to 87.9 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 to 0.75 | |
| 0 to 0.5 |
| Nickel (Ni), % | 0 | |
| 0 to 0.75 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |