EN 1.7706 (G17CrMoV5-10) Cast Steel
EN 1.7706 steel is an alloy steel formulated for casting. Cited properties are appropriate for the quenched and tempered condition. 1.7706 is the EN numeric designation for this material. G17CrMoV5-10 is the EN chemical designation.
It has a very high embodied energy among cast alloy steels. In addition, it has a moderately low ductility and a moderately high tensile strength.
The graph bars on the material properties cards below compare EN 1.7706 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
210
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
17 %
Fatigue Strength
330 MPa 49 x 103 psi
Impact Strength: V-Notched Charpy
30 J 22 ft-lb
Poisson's Ratio
0.29
Shear Modulus
73 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
690 MPa 99 x 103 psi
Tensile Strength: Yield (Proof)
500 MPa 73 x 103 psi
Thermal Properties
Latent Heat of Fusion
260 J/g
Maximum Temperature: Mechanical
440 °C 820 °F
Melting Completion (Liquidus)
1470 °C 2670 °F
Melting Onset (Solidus)
1430 °C 2600 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
40 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
3.7 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
2.3 kg CO2/kg material
Embodied Energy
32 MJ/kg 14 x 103 BTU/lb
Embodied Water
57 L/kg 6.8 gal/lb
Common Calculations
PREN (Pitting Resistance)
4.7
Resilience: Ultimate (Unit Rupture Work)
110 MJ/m3
Resilience: Unit (Modulus of Resilience)
670 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
20 points
Alloy Composition
Among cast alloy steels, the composition of EN 1.7706 steel is notable for including copper (Cu) and vanadium (V). Copper is used to improve corrosion resistance, and to add at least some degree of precipitation hardenability. Vanadium has a strong hardening effect, but this effect is particularly sensitive to the type of tempering.
| Fe | 94.7 to 97.1 | |
| Cr | 1.2 to 1.5 | |
| Mo | 0.9 to 1.1 | |
| Mn | 0.5 to 0.9 | |
| Si | 0 to 0.6 | |
| V | 0.2 to 0.3 | |
| Ni | 0 to 0.4 | |
| C | 0.15 to 0.2 | |
| Cu | 0 to 0.3 | |
| P | 0 to 0.020 | |
| S | 0 to 0.015 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ISO 4991: Steel castings for pressure purposes
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