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EN 1.6554 (G25NiCrMo6) Cast Steel

EN 1.6554 steel is an alloy steel formulated for casting. 1.6554 is the EN numeric designation for this material. G25NiCrMo6 is the EN chemical designation. It can have a moderately high tensile strength among the cast alloy steels in the database.

The properties of EN 1.6554 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 1.6554 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

230 to 280

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

17 to 21 %

Fatigue Strength

380 to 520 MPa 56 to 76 x 103 psi

Impact Strength: V-Notched Charpy

30 to 45 J 22 to 33 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

780 to 930 MPa 110 to 130 x 103 psi

Tensile Strength: Yield (Proof)

550 to 790 MPa 80 to 110 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

420 °C 800 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2580 °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

3.4 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.7 kg CO2/kg material

Embodied Energy

22 MJ/kg 9.6 x 103 BTU/lb

Embodied Water

53 L/kg 6.4 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

140 to 150 MJ/m3

Resilience: Unit (Modulus of Resilience)

810 to 1650 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

27 to 33 points

Strength to Weight: Bending

24 to 27 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

23 to 27 points

Alloy Composition

Among cast alloy steels, the composition of EN 1.6554 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) 94.6 to 97.3
Nickel (Ni) 1.0 to 2.0
Chromium (Cr) 0.7 to 0.9
Manganese (Mn) 0.6 to 0.9
Silicon (Si) 0 to 0.6
Carbon (C) 0.23 to 0.28
Molybdenum (Mo) 0.2 to 0.3
Copper (Cu) 0 to 0.3
Phosphorus (P) 0 to 0.030
Vanadium (V) 0 to 0.030
Sulfur (S) 0 to 0.025

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