EN 1.4421 +QT1 Steel vs. EN 1.4421 +QT2 Steel
Both EN 1.4421 +QT1 steel and EN 1.4421 +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 1.4421 +QT1 steel and the bottom bar is EN 1.4421 +QT2 steel.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 200 | |
200 |
Elongation at Break, % | 17 | |
11 |
Fatigue Strength, MPa | 380 | |
520 |
Impact Strength: V-Notched Charpy, J | 67 | |
30 |
Poisson's Ratio | 0.28 | |
0.28 |
Shear Modulus, GPa | 77 | |
77 |
Tensile Strength: Ultimate (UTS), MPa | 880 | |
1100 |
Tensile Strength: Yield (Proof), MPa | 620 | |
950 |
Thermal Properties
Latent Heat of Fusion, J/g | 280 | |
280 |
Maximum Temperature: Corrosion, °C | 410 | |
410 |
Maximum Temperature: Mechanical, °C | 870 | |
870 |
Melting Completion (Liquidus), °C | 1440 | |
1440 |
Melting Onset (Solidus), °C | 1400 | |
1400 |
Specific Heat Capacity, J/kg-K | 480 | |
480 |
Thermal Conductivity, W/m-K | 16 | |
16 |
Thermal Expansion, µm/m-K | 10 | |
10 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 2.2 | |
2.2 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 2.5 | |
2.5 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 12 | |
12 |
Density, g/cm3 | 7.8 | |
7.8 |
Embodied Carbon, kg CO2/kg material | 2.6 | |
2.6 |
Embodied Energy, MJ/kg | 36 | |
36 |
Embodied Water, L/kg | 130 | |
130 |
Common Calculations
PREN (Pitting Resistance) | 18 | |
18 |
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 | |
120 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 960 | |
2270 |
Stiffness to Weight: Axial, points | 14 | |
14 |
Stiffness to Weight: Bending, points | 25 | |
25 |
Strength to Weight: Axial, points | 31 | |
39 |
Strength to Weight: Bending, points | 26 | |
30 |
Thermal Diffusivity, mm2/s | 4.4 | |
4.4 |
Thermal Shock Resistance, points | 31 | |
39 |
Alloy Composition
Carbon (C), % | 0 to 0.060 | |
0 to 0.060 |
Chromium (Cr), % | 15.5 to 17.5 | |
15.5 to 17.5 |
Iron (Fe), % | 74.4 to 80.5 | |
74.4 to 80.5 |
Manganese (Mn), % | 0 to 1.0 | |
0 to 1.0 |
Molybdenum (Mo), % | 0 to 0.7 | |
0 to 0.7 |
Nickel (Ni), % | 4.0 to 5.5 | |
4.0 to 5.5 |
Phosphorus (P), % | 0 to 0.035 | |
0 to 0.035 |
Silicon (Si), % | 0 to 0.8 | |
0 to 0.8 |
Sulfur (S), % | 0 to 0.020 | |
0 to 0.020 |