ACI-ASTM CF3 Steel vs. ACI-ASTM CF20 Steel
Both ACI-ASTM CF3 steel and ACI-ASTM CF20 steel are iron alloys. Both are furnished in the heat treated (HT) condition. Their average alloy composition is basically identical.
For each property being compared, the top bar is ACI-ASTM CF3 steel and the bottom bar is ACI-ASTM CF20 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 140 | |
| 160 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 60 | |
| 50 |
| Fatigue Strength, MPa | 270 | |
| 240 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 510 | |
| 530 |
| Tensile Strength: Yield (Proof), MPa | 250 | |
| 250 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 300 |
| Maximum Temperature: Corrosion, °C | 420 | |
| 420 |
| Maximum Temperature: Mechanical, °C | 960 | |
| 970 |
| Melting Completion (Liquidus), °C | 1420 | |
| 1420 |
| Melting Onset (Solidus), °C | 1450 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 16 | |
| 16 |
| Thermal Expansion, µm/m-K | 16 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.3 | |
| 2.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 16 | |
| 16 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 3.2 | |
| 3.1 |
| Embodied Energy, MJ/kg | 45 | |
| 44 |
| Embodied Water, L/kg | 150 | |
| 150 |
Common Calculations
| PREN (Pitting Resistance) | 20 | |
| 20 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 250 | |
| 220 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 160 | |
| 160 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 18 | |
| 19 |
| Strength to Weight: Bending, points | 18 | |
| 19 |
| Thermal Diffusivity, mm2/s | 4.3 | |
| 4.3 |
| Thermal Shock Resistance, points | 11 | |
| 11 |
Alloy Composition
| Carbon (C), % | 0 to 0.030 | |
| 0 to 0.2 |
| Chromium (Cr), % | 17 to 21 | |
| 18 to 21 |
| Iron (Fe), % | 62.9 to 75 | |
| 64.2 to 74 |
| Manganese (Mn), % | 0 to 1.5 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 0 |
| Nickel (Ni), % | 8.0 to 12 | |
| 8.0 to 11 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 2.0 | |
| 0 to 2.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.040 |