EN 1.6771 +QT1 Steel vs. EN 1.6771 +QT2 Steel
Both EN 1.6771 +QT1 steel and EN 1.6771 +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 1.6771 +QT1 steel and the bottom bar is EN 1.6771 +QT2 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 280 | |
350 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 8.7 | |
8.0 |
Fatigue Strength, MPa | 440 | |
680 |
Impact Strength: V-Notched Charpy, J | 32 | |
20 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 73 | |
73 |
Tensile Strength: Ultimate (UTS), MPa | 930 | |
1180 |
Tensile Strength: Yield (Proof), MPa | 740 | |
1140 |
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 | 1420 | |
1420 |
Specific Heat Capacity, J/kg-K | 470 | |
470 |
Thermal Conductivity, W/m-K | 46 | |
46 |
Thermal Expansion, µm/m-K | 13 | |
13 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 8.0 | |
8.0 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 9.2 | |
9.2 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 5.0 | |
5.0 |
Density, g/cm3 | 7.9 | |
7.9 |
Embodied Carbon, kg CO2/kg material | 1.9 | |
1.9 |
Embodied Energy, MJ/kg | 25 | |
25 |
Embodied Water, L/kg | 58 | |
58 |
Common Calculations
PREN (Pitting Resistance) | 2.5 | |
2.5 |
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 75 | |
93 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 1460 | |
3450 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 33 | |
41 |
Strength to Weight: Bending, points | 27 | |
31 |
Thermal Diffusivity, mm2/s | 13 | |
13 |
Thermal Shock Resistance, points | 27 | |
35 |
Alloy Composition
Carbon (C), % | 0.27 to 0.33 | |
0.27 to 0.33 |
Chromium (Cr), % | 0.8 to 1.2 | |
0.8 to 1.2 |
Iron (Fe), % | 92.2 to 95 | |
92.2 to 95 |
Manganese (Mn), % | 0.6 to 1.0 | |
0.6 to 1.0 |
Molybdenum (Mo), % | 0.3 to 0.6 | |
0.3 to 0.6 |
Nickel (Ni), % | 3.0 to 4.0 | |
3.0 to 4.0 |
Phosphorus (P), % | 0 to 0.030 | |
0 to 0.030 |
Silicon (Si), % | 0 to 0.6 | |
0 to 0.6 |
Sulfur (S), % | 0 to 0.020 | |
0 to 0.020 |