EN 1.7335 +QT Steel vs. EN 1.7380 +QT Steel
Both EN 1.7335 +QT steel and EN 1.7380 +QT steel are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 98% of their average alloy composition in common.
For each property being compared, the top bar is EN 1.7335 +QT steel and the bottom bar is EN 1.7380 +QT steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 150 | |
| 160 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 21 | |
| 19 |
| Fatigue Strength, MPa | 200 | |
| 200 |
| Impact Strength: V-Notched Charpy, J | 31 | |
| 31 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 74 |
| Shear Strength, MPa | 310 | |
| 330 |
| Tensile Strength: Ultimate (UTS), MPa | 500 | |
| 540 |
| Tensile Strength: Yield (Proof), MPa | 280 | |
| 290 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 260 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 460 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1470 |
| Melting Onset (Solidus), °C | 1420 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 44 | |
| 39 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.6 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 8.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.8 | |
| 3.8 |
| Density, g/cm3 | 7.9 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.6 | |
| 1.8 |
| Embodied Energy, MJ/kg | 21 | |
| 23 |
| Embodied Water, L/kg | 52 | |
| 59 |
Common Calculations
| PREN (Pitting Resistance) | 2.7 | |
| 5.6 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 91 | |
| 87 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 210 | |
| 230 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 18 | |
| 19 |
| Strength to Weight: Bending, points | 18 | |
| 19 |
| Thermal Diffusivity, mm2/s | 12 | |
| 11 |
| Thermal Shock Resistance, points | 15 | |
| 15 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.18 | |
| 0.080 to 0.14 |
| Chromium (Cr), % | 0.7 to 1.2 | |
| 2.0 to 2.5 |
| Copper (Cu), % | 0 to 0.3 | |
| 0 to 0.3 |
| Iron (Fe), % | 96.4 to 98.4 | |
| 94.6 to 96.6 |
| Manganese (Mn), % | 0.4 to 1.0 | |
| 0.4 to 0.8 |
| Molybdenum (Mo), % | 0.4 to 0.6 | |
| 0.9 to 1.1 |
| Nitrogen (N), % | 0 to 0.012 | |
| 0 to 0.012 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.020 |
| Silicon (Si), % | 0 to 0.35 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.010 |