Quenched and Tempered (+QT) 1.7703 Steel
EN 1.7703 +QT steel is EN 1.7703 steel in the quenched and tempered condition. The graph bars on the material properties cards below compare EN 1.7703 +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
200
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Elongation at Break
20 %
Fatigue Strength
320 MPa 47 x 103 psi
Impact Strength: V-Notched Charpy
46 J 34 ft-lb
Poisson's Ratio
0.29
Shear Modulus
74 GPa 11 x 106 psi
Shear Strength
420 MPa 61 x 103 psi
Tensile Strength: Ultimate (UTS)
670 MPa 97 x 103 psi
Tensile Strength: Yield (Proof)
460 MPa 67 x 103 psi
Thermal Properties
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
460 °C 860 °F
Melting Completion (Liquidus)
1470 °C 2680 °F
Melting Onset (Solidus)
1430 °C 2610 °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
7.6 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.7 % IACS
Otherwise Unclassified Properties
Base Metal Price
4.2 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
2.5 kg CO2/kg material
Embodied Energy
35 MJ/kg 15 x 103 BTU/lb
Embodied Water
61 L/kg 7.2 gal/lb
Common Calculations
PREN (Pitting Resistance)
5.6
Resilience: Ultimate (Unit Rupture Work)
120 MJ/m3
Resilience: Unit (Modulus of Resilience)
570 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
24 points
Strength to Weight: Bending
22 points
Thermal Diffusivity
11 mm2/s
Thermal Shock Resistance
19 points
Alloy Composition
| Fe | 94.6 to 96.4 | |
| Cr | 2.0 to 2.5 | |
| Mo | 0.9 to 1.1 | |
| Mn | 0.3 to 0.6 | |
| V | 0.25 to 0.35 | |
| C | 0.11 to 0.15 | |
| Ni | 0 to 0.25 | |
| Cu | 0 to 0.2 | |
| Si | 0 to 0.1 | |
| Nb | 0 to 0.070 | |
| Ti | 0 to 0.030 | |
| P | 0 to 0.015 | |
| N | 0 to 0.012 | |
| S | 0 to 0.0050 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
EN 10028-2: Flat products made of steels for pressure purposes - Part 2: Non-alloy and alloy steels with specified elevated temperature properties
Welding Metallurgy, 2nd ed., Sindo Kou, 2003
Creep-Resistant Steels, Fujio Abe et al. (editors), 2008
Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011
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