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EN 1.5638 (G9Ni14) Cast Steel

EN 1.5638 steel is an alloy steel formulated for casting. Cited properties are appropriate for the quenched and tempered condition. 1.5638 is the EN numeric designation for this material. G9Ni14 is the EN chemical designation.

It has a fairly high thermal conductivity among cast alloy steels. In addition, it has a moderately high base cost and a moderately low tensile strength.

The graph bars on the material properties cards below compare EN 1.5638 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

170

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

23 %

Fatigue Strength

290 MPa 42 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

580 MPa 83 x 103 psi

Tensile Strength: Yield (Proof)

410 MPa 60 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

410 °C 770 °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

52 W/m-K 30 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.6 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

4.0 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.7 kg CO2/kg material

Embodied Energy

23 MJ/kg 9.8 x 103 BTU/lb

Embodied Water

52 L/kg 6.2 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

120 MJ/m3

Resilience: Unit (Modulus of Resilience)

450 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

20 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

14 m2/s

Thermal Shock Resistance

17 points

Alloy Composition

Among cast alloy steels, the composition of EN 1.5638 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) 94.4 to 96.4
Nickel (Ni) 3.0 to 4.0
Manganese (Mn) 0.5 to 0.8
Silicon (Si) 0 to 0.6
Carbon (C) 0.060 to 0.12
Phosphorus (P) 0 to 0.020
Sulfur (S) 0 to 0.015

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ISO 4991: Steel castings for pressure purposes

EN 10293: Steel castings - Steel castings for general engineering uses

Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993

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