Quenched and Tempered (+QT2) 1.6579 Cast Steel
EN 1.6579 +QT2 steel is EN 1.6579 steel in the quenched and tempered condition. It has the highest strength and lowest ductility compared to the other variants of EN 1.6579 steel. The graph bars on the material properties cards below compare EN 1.6579 +QT2 steel to: cast alloy steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Brinell Hardness
290
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
11 %
Fatigue Strength
570 MPa 82 x 103 psi
Impact Strength: V-Notched Charpy
39 J 29 ft-lb
Poisson's Ratio
0.29
Shear Modulus
73 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
980 MPa 140 x 103 psi
Tensile Strength: Yield (Proof)
910 MPa 130 x 103 psi
Thermal Properties
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
440 °C 820 °F
Melting Completion (Liquidus)
1460 °C 2650 °F
Melting Onset (Solidus)
1410 °C 2580 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
39 W/m-K 23 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.7 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.8 % IACS
Otherwise Unclassified Properties
Base Metal Price
3.7 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
1.7 kg CO2/kg material
Embodied Energy
22 MJ/kg 9.6 x 103 BTU/lb
Embodied Water
56 L/kg 6.7 gal/lb
Common Calculations
PREN (Pitting Resistance)
2.4
Resilience: Ultimate (Unit Rupture Work)
110 MJ/m3
Resilience: Unit (Modulus of Resilience)
2210 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
35 points
Strength to Weight: Bending
28 points
Thermal Diffusivity
11 mm2/s
Thermal Shock Resistance
29 points
Alloy Composition
| Fe | 94.2 to 96.1 | |
| Ni | 1.4 to 1.7 | |
| Cr | 1.4 to 1.7 | |
| Mn | 0.6 to 1.0 | |
| C | 0.32 to 0.38 | |
| Si | 0 to 0.6 | |
| Mo | 0.15 to 0.35 | |
| S | 0 to 0.030 | |
| P | 0 to 0.025 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
EN 10293: Steel castings - Steel castings for general engineering uses
Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005
Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015
Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015