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.
| Fe | 95.6 to 98.2 | |
| Mn | 0.6 to 1.0 | |
| Cr | 0.4 to 0.8 | |
| Ni | 0.4 to 0.8 | |
| Si | 0 to 0.8 | |
| C | 0.23 to 0.28 | |
| Mo | 0.15 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