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EN 1.6553 (G25NiCrMo3) Cast Steel

EN 1.6553 steel is an alloy steel formulated for casting. 1.6553 is the EN numeric designation for this material. G25NiCrMo3 is the EN chemical designation.

It has a moderately low thermal conductivity among cast alloy steels. In addition, it has a moderately low embodied energy and a moderately low base cost.

The properties of EN 1.6553 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 1.6553 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 to 240

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

19 to 21 %

Fatigue Strength

330 to 460 MPa 48 to 66 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)

710 to 800 MPa 100 to 120 x 103 psi

Tensile Strength: Yield (Proof)

470 to 670 MPa 69 to 97 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

420 °C 780 °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

39 W/m-K 22 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.7 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.6 kg CO2/kg material

Embodied Energy

21 MJ/kg 9.0 x 103 BTU/lb

Embodied Water

51 L/kg 6.1 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

130 to 150 MJ/m3

Resilience: Unit (Modulus of Resilience)

600 to 1190 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

25 to 28 points

Strength to Weight: Bending

23 to 24 points

Thermal Diffusivity

10 mm2/s

Thermal Shock Resistance

21 to 23 points

Alloy Composition

Among cast alloy steels, the composition of EN 1.6553 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) 95.6 to 98.2
Manganese (Mn) 0.6 to 1.0
Chromium (Cr) 0.4 to 0.8
Nickel (Ni) 0.4 to 0.8
Silicon (Si) 0 to 0.8
Carbon (C) 0.23 to 0.28
Molybdenum (Mo) 0.15 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