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EN 1.7725 (G30CrMoV6-4) Cast Steel

EN 1.7725 steel is an alloy steel formulated for casting. 1.7725 is the EN numeric designation for this material. G30CrMoV6-4 is the EN chemical designation.

It can have a fairly high tensile strength among cast alloy steels. In addition, it has a moderately low thermal conductivity and a fairly low ductility.

The properties of EN 1.7725 steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.7725 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

250 to 300

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

14 %

Fatigue Strength

390 to 550 MPa 57 to 79 x 103 psi

Impact Strength: V-Notched Charpy

34 to 35 J 25 to 26 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

830 to 1000 MPa 120 to 150 x 103 psi

Tensile Strength: Yield (Proof)

610 to 860 MPa 88 to 120 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

440 °C 820 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2590 °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

7.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.9 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.8 kg CO2/kg material

Embodied Energy

24 MJ/kg 11 x 103 BTU/lb

Embodied Water

54 L/kg 6.5 gal/lb

Common Calculations

PREN (Pitting Resistance)

2.8

Resilience: Ultimate (Unit Rupture Work)

110 to 130 MJ/m3

Resilience: Unit (Modulus of Resilience)

980 to 1940 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

29 to 35 points

Strength to Weight: Bending

25 to 28 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

24 to 29 points

Alloy Composition

Among cast alloy steels, the composition of EN 1.7725 steel is notable for including vanadium (V). Vanadium has a strong hardening effect, but this effect is particularly sensitive to the type of tempering.

Iron (Fe) 95.7 to 97.5
Chromium (Cr) 1.3 to 1.7
Manganese (Mn) 0.6 to 1.0
Molybdenum (Mo) 0.3 to 0.5
Carbon (C) 0.27 to 0.34
Silicon (Si) 0 to 0.6
Vanadium (V) 0.050 to 0.15
Sulfur (S) 0 to 0.030
Phosphorus (P) 0 to 0.025

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

EN 10293: Steel castings - Steel castings for general engineering uses

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