Ductile Cast Iron vs. AISI 440A Stainless Steel
Both ductile cast iron and AISI 440A stainless steel are iron alloys. They have 82% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is ductile cast iron and the bottom bar is AISI 440A stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 170 to 180 | |
| 200 |
| Elongation at Break, % | 2.1 to 20 | |
| 5.0 to 20 |
| Poisson's Ratio | 0.28 to 0.31 | |
| 0.28 |
| Shear Modulus, GPa | 64 to 70 | |
| 77 |
| Shear Strength, MPa | 420 to 800 | |
| 450 to 1040 |
| Tensile Strength: Ultimate (UTS), MPa | 460 to 920 | |
| 730 to 1790 |
| Tensile Strength: Yield (Proof), MPa | 310 to 670 | |
| 420 to 1650 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 290 | |
| 760 |
| Melting Completion (Liquidus), °C | 1160 | |
| 1480 |
| Melting Onset (Solidus), °C | 1120 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 480 |
| Thermal Conductivity, W/m-K | 31 to 36 | |
| 23 |
| Thermal Expansion, µm/m-K | 11 | |
| 10 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 2.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 to 9.4 | |
| 2.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.9 | |
| 9.0 |
| Density, g/cm3 | 7.1 to 7.5 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 2.2 |
| Embodied Energy, MJ/kg | 21 | |
| 31 |
| Embodied Water, L/kg | 43 | |
| 120 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 17 to 80 | |
| 87 to 120 |
| Stiffness to Weight: Axial, points | 12 to 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 to 26 | |
| 25 |
| Strength to Weight: Axial, points | 17 to 35 | |
| 26 to 65 |
| Strength to Weight: Bending, points | 18 to 29 | |
| 23 to 43 |
| Thermal Diffusivity, mm2/s | 8.9 to 10 | |
| 6.2 |
| Thermal Shock Resistance, points | 17 to 35 | |
| 26 to 65 |
Alloy Composition
| Carbon (C), % | 3.0 to 3.5 | |
| 0.6 to 0.75 |
| Chromium (Cr), % | 0 | |
| 16 to 18 |
| Iron (Fe), % | 93.7 to 95.5 | |
| 78.4 to 83.4 |
| Manganese (Mn), % | 0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 0 to 0.75 |
| Phosphorus (P), % | 0 to 0.080 | |
| 0 to 0.040 |
| Silicon (Si), % | 1.5 to 2.8 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |