EN 1.4935 +QT700 Steel vs. EN 1.4935 +QT800 Steel
Both EN 1.4935 +QT700 steel and EN 1.4935 +QT800 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 1.4935 +QT700 steel and the bottom bar is EN 1.4935 +QT800 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 200 |
| Elongation at Break, % | 18 | |
| 16 |
| Fatigue Strength, MPa | 350 | |
| 400 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 76 | |
| 76 |
| Shear Strength, MPa | 480 | |
| 540 |
| Tensile Strength: Ultimate (UTS), MPa | 780 | |
| 880 |
| Tensile Strength: Yield (Proof), MPa | 570 | |
| 670 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 270 |
| Maximum Temperature: Corrosion, °C | 380 | |
| 380 |
| Maximum Temperature: Mechanical, °C | 740 | |
| 740 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 24 | |
| 24 |
| Thermal Expansion, µm/m-K | 11 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.9 | |
| 2.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 3.3 | |
| 3.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.0 | |
| 9.0 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.9 | |
| 2.9 |
| Embodied Energy, MJ/kg | 42 | |
| 42 |
| Embodied Water, L/kg | 100 | |
| 100 |
Common Calculations
| PREN (Pitting Resistance) | 16 | |
| 16 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 130 | |
| 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 830 | |
| 1160 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 28 | |
| 31 |
| Strength to Weight: Bending, points | 24 | |
| 26 |
| Thermal Diffusivity, mm2/s | 6.5 | |
| 6.5 |
| Thermal Shock Resistance, points | 27 | |
| 30 |
Alloy Composition
| Carbon (C), % | 0.17 to 0.24 | |
| 0.17 to 0.24 |
| Chromium (Cr), % | 11 to 12.5 | |
| 11 to 12.5 |
| Iron (Fe), % | 83 to 86.7 | |
| 83 to 86.7 |
| Manganese (Mn), % | 0.3 to 0.8 | |
| 0.3 to 0.8 |
| Molybdenum (Mo), % | 0.8 to 1.2 | |
| 0.8 to 1.2 |
| Nickel (Ni), % | 0.3 to 0.8 | |
| 0.3 to 0.8 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.025 |
| Silicon (Si), % | 0.1 to 0.5 | |
| 0.1 to 0.5 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.015 |
| Tungsten (W), % | 0.4 to 0.6 | |
| 0.4 to 0.6 |
| Vanadium (V), % | 0.2 to 0.35 | |
| 0.2 to 0.35 |