SAE-AISI 8620 Steel vs. ACI-ASTM CK20 Steel
Both SAE-AISI 8620 steel and ACI-ASTM CK20 steel are iron alloys. They have 55% 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 SAE-AISI 8620 steel and the bottom bar is ACI-ASTM CK20 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 to 210 | |
| 150 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 13 to 31 | |
| 37 |
| Fatigue Strength, MPa | 270 to 360 | |
| 220 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 78 |
| Tensile Strength: Ultimate (UTS), MPa | 520 to 690 | |
| 530 |
| Tensile Strength: Yield (Proof), MPa | 360 to 570 | |
| 260 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 310 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 1100 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1400 |
| Melting Onset (Solidus), °C | 1420 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 39 | |
| 14 |
| Thermal Expansion, µm/m-K | 13 | |
| 15 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 2.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 25 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 4.4 |
| Embodied Energy, MJ/kg | 20 | |
| 62 |
| Embodied Water, L/kg | 50 | |
| 190 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 86 to 150 | |
| 160 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 340 to 880 | |
| 170 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 18 to 24 | |
| 19 |
| Strength to Weight: Bending, points | 18 to 22 | |
| 19 |
| Thermal Diffusivity, mm2/s | 10 | |
| 3.7 |
| Thermal Shock Resistance, points | 15 to 20 | |
| 13 |
Alloy Composition
| Carbon (C), % | 0.18 to 0.23 | |
| 0 to 0.2 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 23 to 27 |
| Iron (Fe), % | 96.9 to 98 | |
| 46.7 to 58 |
| Manganese (Mn), % | 0.7 to 0.9 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0.15 to 0.25 | |
| 0 to 0.5 |
| Nickel (Ni), % | 0.4 to 0.7 | |
| 19 to 22 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 2.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.040 |