EN 1.6771 (G30NiCrMo14) Cast Steel
EN 1.6771 steel is an alloy steel formulated for casting. 1.6771 is the EN numeric designation for this material. G30NiCrMo14 is the EN chemical designation.
It can have a very high tensile strength among cast alloy steels. In addition, it can have a very low ductility and has a fairly high base cost.
The properties of EN 1.6771 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 1.6771 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
280 to 350
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
8.0 to 8.7 %
Fatigue Strength
440 to 680 MPa 64 to 98 x 103 psi
Impact Strength: V-Notched Charpy
20 to 32 J 14 to 23 ft-lb
Poisson's Ratio
0.29
Shear Modulus
73 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
930 to 1180 MPa 130 to 170 x 103 psi
Tensile Strength: Yield (Proof)
740 to 1140 MPa 110 to 170 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 2580 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
46 W/m-K 27 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
8.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
9.2 % IACS
Otherwise Unclassified Properties
Base Metal Price
5.0 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
1.9 kg CO2/kg material
Embodied Energy
25 MJ/kg 11 x 103 BTU/lb
Embodied Water
58 L/kg 7.0 gal/lb
Common Calculations
PREN (Pitting Resistance)
2.5
Resilience: Ultimate (Unit Rupture Work)
75 to 93 MJ/m3
Resilience: Unit (Modulus of Resilience)
1460 to 3450 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
33 to 41 points
Strength to Weight: Bending
27 to 31 points
Thermal Diffusivity
13 mm2/s
Thermal Shock Resistance
27 to 35 points
Alloy Composition
Among cast alloy steels, the composition of EN 1.6771 steel is notable for containing a comparatively high amount of nickel (Ni). Nickel is used to improve mechanical properties, and to make the alloy easier to heat treat.
| Fe | 92.2 to 95 | |
| Ni | 3.0 to 4.0 | |
| Cr | 0.8 to 1.2 | |
| Mn | 0.6 to 1.0 | |
| Mo | 0.3 to 0.6 | |
| C | 0.27 to 0.33 | |
| Si | 0 to 0.6 | |
| P | 0 to 0.030 | |
| S | 0 to 0.020 |
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
Welding Metallurgy, 2nd ed., Sindo Kou, 2003
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