ACI-ASTM CK20 Steel vs. AISI 440B Stainless Steel
Both ACI-ASTM CK20 steel and AISI 440B stainless steel are iron alloys. They have 71% of their average alloy composition in common. There are 30 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 ACI-ASTM CK20 steel and the bottom bar is AISI 440B stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 37 | |
| 3.0 to 18 |
| Fatigue Strength, MPa | 220 | |
| 260 to 850 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 78 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 530 | |
| 740 to 1930 |
| Tensile Strength: Yield (Proof), MPa | 260 | |
| 430 to 1860 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 280 |
| Maximum Temperature: Corrosion, °C | 440 | |
| 390 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 870 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1480 |
| Melting Onset (Solidus), °C | 1430 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 14 | |
| 23 |
| Thermal Expansion, µm/m-K | 15 | |
| 10 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 2.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.3 | |
| 2.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 25 | |
| 9.0 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 4.4 | |
| 2.2 |
| Embodied Energy, MJ/kg | 62 | |
| 31 |
| Embodied Water, L/kg | 190 | |
| 120 |
Common Calculations
| PREN (Pitting Resistance) | 26 | |
| 18 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 160 | |
| 57 to 110 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 19 | |
| 27 to 70 |
| Strength to Weight: Bending, points | 19 | |
| 24 to 45 |
| Thermal Diffusivity, mm2/s | 3.7 | |
| 6.1 |
| Thermal Shock Resistance, points | 13 | |
| 27 to 70 |
Alloy Composition
| Carbon (C), % | 0 to 0.2 | |
| 0.75 to 1.0 |
| Chromium (Cr), % | 23 to 27 | |
| 16 to 18 |
| Iron (Fe), % | 46.7 to 58 | |
| 78.2 to 83.3 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 0 to 0.75 |
| Nickel (Ni), % | 19 to 22 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 2.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.015 |