EN 1.5663 (X7Ni9) Nickel Steel
EN 1.5663 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the quenched and tempered condition. 1.5663 is the EN numeric designation for this material. X7Ni9 is the EN chemical designation.
It has a very high density among EN wrought alloy steels. In addition, it has a very high base cost and a very high electrical conductivity.
The graph bars on the material properties cards below compare EN 1.5663 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
230
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
20 %
Fatigue Strength
450 MPa 66 x 103 psi
Impact Strength: V-Notched Charpy
120 J 92 ft-lb
Poisson's Ratio
0.29
Shear Modulus
73 GPa 11 x 106 psi
Shear Strength
470 MPa 68 x 103 psi
Tensile Strength: Ultimate (UTS)
750 MPa 110 x 103 psi
Tensile Strength: Yield (Proof)
660 MPa 95 x 103 psi
Thermal Properties
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
430 °C 800 °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 Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
8.7 % IACS
Electrical Conductivity: Equal Weight (Specific)
9.8 % IACS
Otherwise Unclassified Properties
Base Metal Price
7.5 % relative
Density
8.0 g/cm3 500 lb/ft3
Embodied Carbon
2.3 kg CO2/kg material
Embodied Energy
31 MJ/kg 13 x 103 BTU/lb
Embodied Water
63 L/kg 7.5 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
150 MJ/m3
Resilience: Unit (Modulus of Resilience)
1150 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
26 points
Strength to Weight: Bending
23 points
Thermal Shock Resistance
22 points
Alloy Composition
Among alloy steels, the composition of EN 1.5663 steel is notable for including vanadium (V) and nickel (Ni). Vanadium has a strong hardening effect, but this effect is particularly sensitive to the type of tempering. Nickel is used to improve mechanical properties, and to make the alloy easier to heat treat.
| Fe | 88.6 to 91.2 | |
| Ni | 8.5 to 10 | |
| Mn | 0.3 to 0.8 | |
| Si | 0 to 0.35 | |
| C | 0 to 0.1 | |
| Mo | 0 to 0.1 | |
| P | 0 to 0.015 | |
| V | 0 to 0.010 | |
| S | 0 to 0.0050 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 10028-4: Flat products made of steels for pressure purposes - Part 4: Nickel alloy steels with specified low temperature properties
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