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.
| Fe | 94.6 to 97.3 | |
| Ni | 1.0 to 2.0 | |
| Cr | 0.7 to 0.9 | |
| Mn | 0.6 to 0.9 | |
| Si | 0 to 0.6 | |
| C | 0.23 to 0.28 | |
| Mo | 0.2 to 0.3 | |
| Cu | 0 to 0.3 | |
| P | 0 to 0.030 | |
| V | 0 to 0.030 | |
| 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