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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.

Iron (Fe) 92.2 to 95
Nickel (Ni) 3.0 to 4.0
Chromium (Cr) 0.8 to 1.2
Manganese (Mn) 0.6 to 1.0
Molybdenum (Mo) 0.3 to 0.6
Carbon (C) 0.27 to 0.33
Silicon (Si) 0 to 0.6
Phosphorus (P) 0 to 0.030
Sulfur (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