EN 1.6554 +QT1 Steel vs. EN 1.6554 +QT2 Steel
Both EN 1.6554 +QT1 steel and EN 1.6554 +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 1.6554 +QT1 steel and the bottom bar is EN 1.6554 +QT2 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 230 | |
280 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
190 |
Elongation at Break, % | 21 | |
17 |
Fatigue Strength, MPa | 380 | |
520 |
Impact Strength: V-Notched Charpy, J | 30 | |
45 |
Poisson's Ratio | 0.29 | |
0.29 |
Shear Modulus, GPa | 73 | |
73 |
Tensile Strength: Ultimate (UTS), MPa | 780 | |
930 |
Tensile Strength: Yield (Proof), MPa | 550 | |
790 |
Thermal Properties
Latent Heat of Fusion, J/g | 250 | |
250 |
Maximum Temperature: Mechanical, °C | 420 | |
420 |
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 | 40 | |
40 |
Thermal Expansion, µm/m-K | 13 | |
13 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.6 | |
7.6 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.7 | |
8.7 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 3.4 | |
3.4 |
Density, g/cm3 | 7.9 | |
7.9 |
Embodied Carbon, kg CO2/kg material | 1.7 | |
1.7 |
Embodied Energy, MJ/kg | 22 | |
22 |
Embodied Water, L/kg | 53 | |
53 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 | |
150 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 810 | |
1650 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
24 |
Strength to Weight: Axial, points | 27 | |
33 |
Strength to Weight: Bending, points | 24 | |
27 |
Thermal Diffusivity, mm2/s | 11 | |
11 |
Thermal Shock Resistance, points | 23 | |
27 |
Alloy Composition
Carbon (C), % | 0.23 to 0.28 | |
0.23 to 0.28 |
Chromium (Cr), % | 0.7 to 0.9 | |
0.7 to 0.9 |
Copper (Cu), % | 0 to 0.3 | |
0 to 0.3 |
Iron (Fe), % | 94.6 to 97.3 | |
94.6 to 97.3 |
Manganese (Mn), % | 0.6 to 0.9 | |
0.6 to 0.9 |
Molybdenum (Mo), % | 0.2 to 0.3 | |
0.2 to 0.3 |
Nickel (Ni), % | 1.0 to 2.0 | |
1.0 to 2.0 |
Phosphorus (P), % | 0 to 0.030 | |
0 to 0.030 |
Silicon (Si), % | 0 to 0.6 | |
0 to 0.6 |
Sulfur (S), % | 0 to 0.025 | |
0 to 0.025 |
Vanadium (V), % | 0 to 0.030 | |
0 to 0.030 |