EN 1.7720 (G12MoCrV5-2) Cast Steel
EN 1.7720 steel is an alloy steel formulated for casting. Cited properties are appropriate for the quenched and tempered condition. 1.7720 is the EN numeric designation for this material. G12MoCrV5-2 is the EN chemical designation.
It has a moderately low electrical conductivity among cast alloy steels. In addition, it has a fairly high embodied energy and a moderately low base cost.
The graph bars on the material properties cards below compare EN 1.7720 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
180
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
19 %
Fatigue Strength
230 MPa 33 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)
590 MPa 85 x 103 psi
Tensile Strength: Yield (Proof)
340 MPa 49 x 103 psi
Thermal Properties
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
410 °C 780 °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
7.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.4 % IACS
Otherwise Unclassified Properties
Base Metal Price
2.8 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
2.2 kg CO2/kg material
Embodied Energy
30 MJ/kg 13 x 103 BTU/lb
Embodied Water
51 L/kg 6.1 gal/lb
Common Calculations
PREN (Pitting Resistance)
2.1
Resilience: Ultimate (Unit Rupture Work)
97 MJ/m3
Resilience: Unit (Modulus of Resilience)
300 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
21 points
Strength to Weight: Bending
20 points
Thermal Diffusivity
11 mm2/s
Thermal Shock Resistance
17 points
Alloy Composition
Among cast alloy steels, the composition of EN 1.7720 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 | 96.6 to 98.6 | |
| Mn | 0.4 to 0.7 | |
| Mo | 0.4 to 0.6 | |
| Cr | 0.3 to 0.5 | |
| V | 0.22 to 0.3 | |
| Si | 0 to 0.45 | |
| Ni | 0 to 0.4 | |
| Cu | 0 to 0.3 | |
| C | 0.1 to 0.15 | |
| P | 0 to 0.030 | |
| S | 0 to 0.020 |
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