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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.

Iron (Fe) 96.6 to 98.6
Manganese (Mn) 0.4 to 0.7
Molybdenum (Mo) 0.4 to 0.6
Chromium (Cr) 0.3 to 0.5
Vanadium (V) 0.22 to 0.3
Silicon (Si) 0 to 0.45
Nickel (Ni) 0 to 0.4
Copper (Cu) 0 to 0.3
Carbon (C) 0.1 to 0.15
Phosphorus (P) 0 to 0.030
Sulfur (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