Quenched and Tempered (+QT) 1.8151 Steel
EN 1.8151 +QT steel is EN 1.8151 steel in the quenched and tempered condition. It has the second highest strength compared to the other variants of EN 1.8151 steel. The graph bars on the material properties cards below compare EN 1.8151 +QT steel to: EN wrought 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
540
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
8.0 %
Fatigue Strength
1050 MPa 150 x 103 psi
Impact Strength: U-Notched Charpy
15 J 11 ft-lb
Poisson's Ratio
0.29
Reduction in Area
45 %
Shear Modulus
72 GPa 10 x 106 psi
Shear Strength
1060 MPa 150 x 103 psi
Tensile Strength: Ultimate (UTS)
1790 MPa 260 x 103 psi
Tensile Strength: Yield (Proof)
1770 MPa 260 x 103 psi
Thermal Properties
Latent Heat of Fusion
270 J/g
Maximum Temperature: Mechanical
410 °C 770 °F
Melting Completion (Liquidus)
1440 °C 2630 °F
Melting Onset (Solidus)
1400 °C 2550 °F
Specific Heat Capacity
480 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
50 W/m-K 29 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.4 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.6 % IACS
Otherwise Unclassified Properties
Base Metal Price
2.2 % relative
Density
7.7 g/cm3 480 lb/ft3
Embodied Carbon
1.8 kg CO2/kg material
Embodied Energy
25 MJ/kg 11 x 103 BTU/lb
Embodied Water
49 L/kg 5.9 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
140 MJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
64 points
Strength to Weight: Bending
42 points
Thermal Diffusivity
14 mm2/s
Thermal Shock Resistance
54 points
Alloy Composition
| Fe | 95.9 to 97.2 | |
| Si | 1.3 to 1.7 | |
| Mn | 0.6 to 0.9 | |
| Cr | 0.4 to 0.8 | |
| C | 0.4 to 0.5 | |
| V | 0.1 to 0.2 | |
| P | 0 to 0.025 | |
| S | 0 to 0.025 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
EN 10089: Hot rolled steels for quenched and tempered springs - Technical delivery conditions
Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005
Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008
Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015