EN 1.4020 +AT Steel vs. EN 1.4378 +AT Steel
Both EN 1.4020 +AT steel and EN 1.4378 +AT steel are iron alloys. Both are furnished in the solution annealed (AT) condition. They have a very high 98% of their average alloy composition in common.
For each property being compared, the top bar is EN 1.4020 +AT steel and the bottom bar is EN 1.4378 +AT steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 | |
| 190 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 34 | |
| 34 |
| Fatigue Strength, MPa | 340 | |
| 340 |
| Impact Strength: V-Notched Charpy, J | 90 | |
| 91 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 77 |
| Shear Strength, MPa | 510 | |
| 510 |
| Tensile Strength: Ultimate (UTS), MPa | 770 | |
| 760 |
| Tensile Strength: Yield (Proof), MPa | 430 | |
| 430 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 410 | |
| 410 |
| Maximum Temperature: Mechanical, °C | 890 | |
| 910 |
| Melting Completion (Liquidus), °C | 1390 | |
| 1390 |
| Melting Onset (Solidus), °C | 1350 | |
| 1350 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Expansion, µm/m-K | 17 | |
| 17 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 11 | |
| 12 |
| Density, g/cm3 | 7.6 | |
| 7.6 |
| Embodied Carbon, kg CO2/kg material | 2.5 | |
| 2.7 |
| Embodied Energy, MJ/kg | 37 | |
| 39 |
| Embodied Water, L/kg | 150 | |
| 150 |
Common Calculations
| PREN (Pitting Resistance) | 23 | |
| 23 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 220 | |
| 220 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 460 | |
| 470 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 28 | |
| 28 |
| Strength to Weight: Bending, points | 25 | |
| 24 |
| Thermal Shock Resistance, points | 16 | |
| 16 |
Alloy Composition
| Carbon (C), % | 0 to 0.15 | |
| 0 to 0.080 |
| Chromium (Cr), % | 16.5 to 19 | |
| 17 to 19 |
| Iron (Fe), % | 62.8 to 71.8 | |
| 61.2 to 69 |
| Manganese (Mn), % | 11 to 14 | |
| 11.5 to 14.5 |
| Nickel (Ni), % | 0.5 to 2.5 | |
| 2.3 to 3.7 |
| Nitrogen (N), % | 0.2 to 0.45 | |
| 0.2 to 0.4 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.060 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |