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
0.29
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
Density
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)
2.4
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.
| Fe | 94.2 to 96.1 | |
| Ni | 1.4 to 1.7 | |
| Cr | 1.4 to 1.7 | |
| Mn | 0.6 to 1.0 | |
| C | 0.32 to 0.38 | |
| Si | 0 to 0.6 | |
| Mo | 0.15 to 0.35 | |
| S | 0 to 0.030 | |
| 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