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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.

Iron (Fe) 95.3 to 97.5
Nickel (Ni) 0.8 to 1.2
Manganese (Mn) 0.8 to 1.2
Molybdenum (Mo) 0.4 to 0.8
Chromium (Cr) 0.3 to 0.5
Silicon (Si) 0 to 0.6
Carbon (C) 0.17 to 0.23
Sulfur (S) 0 to 0.030
Phosphorus (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