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EN 1.6579 (G35CrNiMo6-6) Cast Steel

EN 1.6579 steel is an alloy steel formulated for casting. 1.6579 is the EN numeric designation for this material. G35CrNiMo6-6 is the EN chemical designation.

It can have a fairly low ductility among cast alloy steels. In addition, it can have a very high tensile strength and has a moderately low thermal conductivity.

The properties of EN 1.6579 steel include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.6579 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

260 to 290

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

11 to 14 %

Fatigue Strength

380 to 570 MPa 56 to 82 x 103 psi

Impact Strength: V-Notched Charpy

35 to 41 J 26 to 30 ft-lb

Poisson's Ratio


Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

850 to 980 MPa 120 to 140 x 103 psi

Tensile Strength: Yield (Proof)

600 to 910 MPa 87 to 130 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

440 °C 820 °F

Melting Completion (Liquidus)

1460 °C 2650 °F

Melting Onset (Solidus)

1410 °C 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

39 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.8 % IACS

Otherwise Unclassified Properties

Base Metal Price

3.7 % relative


7.8 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

56 L/kg 6.7 gal/lb

Common Calculations

PREN (Pitting Resistance)


Resilience: Ultimate (Unit Rupture Work)

100 to 120 MJ/m3

Resilience: Unit (Modulus of Resilience)

950 to 2210 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

30 to 35 points

Strength to Weight: Bending

25 to 28 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

25 to 29 points

Alloy Composition

Among cast alloy steels, the composition of EN 1.6579 steel is notable for containing comparatively high amounts of chromium (Cr) and nickel (Ni). Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures). Nickel is used to improve mechanical properties, and to make the alloy easier to heat treat.

Iron (Fe)Fe 94.2 to 96.1
Nickel (Ni)Ni 1.4 to 1.7
Chromium (Cr)Cr 1.4 to 1.7
Manganese (Mn)Mn 0.6 to 1.0
Carbon (C)C 0.32 to 0.38
Silicon (Si)Si 0 to 0.6
Molybdenum (Mo)Mo 0.15 to 0.35
Sulfur (S)S 0 to 0.030
Phosphorus (P)P 0 to 0.025

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

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015