EN 1.6750 (G20NiMoCr4) Cast Steel
EN 1.6750 steel is an alloy steel formulated for casting. Cited properties are appropriate for the quenched and tempered condition. 1.6750 is the EN numeric designation for this material. G20NiMoCr4 is the EN chemical designation.
It has a moderately low thermal conductivity and a moderately low ductility among cast alloy steels.
The graph bars on the material properties cards below compare EN 1.6750 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
190
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
18 %
Fatigue Strength
310 MPa 45 x 103 psi
Impact Strength: V-Notched Charpy
46 J 34 ft-lb
Poisson's Ratio
0.29
Shear Modulus
73 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
650 MPa 94 x 103 psi
Tensile Strength: Yield (Proof)
460 MPa 67 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 2590 °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
3.3 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
1.7 kg CO2/kg material
Embodied Energy
22 MJ/kg 9.5 x 103 BTU/lb
Embodied Water
52 L/kg 6.2 gal/lb
Common Calculations
PREN (Pitting Resistance)
2.4
Resilience: Ultimate (Unit Rupture Work)
110 MJ/m3
Resilience: Unit (Modulus of Resilience)
570 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
23 points
Strength to Weight: Bending
21 points
Thermal Diffusivity
10 mm2/s
Thermal Shock Resistance
19 points
Alloy Composition
Among cast alloy steels, the composition of EN 1.6750 steel is notable for containing comparatively high amounts of nickel (Ni) and manganese (Mn). Nickel is used to improve mechanical properties, and to make the alloy easier to heat treat. Manganese is used to improve hardenability and surface quality.
| Fe | 95.3 to 97.5 | |
| Ni | 0.8 to 1.2 | |
| Mn | 0.8 to 1.2 | |
| Mo | 0.4 to 0.8 | |
| Cr | 0.3 to 0.5 | |
| Si | 0 to 0.6 | |
| C | 0.17 to 0.23 | |
| 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
ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996
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