EN 1.6579 +QT1 Steel vs. EN 1.6579 +QT2 Steel
Both EN 1.6579 +QT1 steel and EN 1.6579 +QT2 steel are variants of the same material. They share alloy composition and many physical properties, but develop different mechanical properties as a result of different processing.
For each property being compared, the top bar is EN 1.6579 +QT1 steel and the bottom bar is EN 1.6579 +QT2 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 270 | |
| 290 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 14 | |
| 11 |
| Fatigue Strength, MPa | 490 | |
| 570 |
| Impact Strength: V-Notched Charpy, J | 41 | |
| 39 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 890 | |
| 980 |
| Tensile Strength: Yield (Proof), MPa | 760 | |
| 910 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 440 | |
| 440 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1410 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 39 | |
| 39 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.7 | |
| 7.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 8.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.7 | |
| 3.7 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 1.7 |
| Embodied Energy, MJ/kg | 22 | |
| 22 |
| Embodied Water, L/kg | 56 | |
| 56 |
Common Calculations
| PREN (Pitting Resistance) | 2.4 | |
| 2.4 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1530 | |
| 2210 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 32 | |
| 35 |
| Strength to Weight: Bending, points | 26 | |
| 28 |
| Thermal Diffusivity, mm2/s | 11 | |
| 11 |
| Thermal Shock Resistance, points | 26 | |
| 29 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.38 | |
| 0.32 to 0.38 |
| Chromium (Cr), % | 1.4 to 1.7 | |
| 1.4 to 1.7 |
| Iron (Fe), % | 94.2 to 96.1 | |
| 94.2 to 96.1 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 0.15 to 0.35 | |
| 0.15 to 0.35 |
| Nickel (Ni), % | 1.4 to 1.7 | |
| 1.4 to 1.7 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 0.6 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |