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EN 1.6220 (G20Mn5) Cast Steel

EN 1.6220 steel is an alloy steel formulated for casting. 1.6220 is the EN numeric designation for this material. G20Mn5 is the EN chemical designation. It has a fairly high thermal conductivity among cast alloy steels. In addition, it has a very low embodied energy and a very low base cost.

The properties of EN 1.6220 steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.6220 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 to 25 %

Fatigue Strength

240 to 250 MPa 35 to 36 x 103 psi

Impact Strength: V-Notched Charpy

49 to 57 J 36 to 42 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

550 to 580 MPa 80 to 83 x 103 psi

Tensile Strength: Yield (Proof)

340 MPa 49 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

400 °C 750 °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

7.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.1 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.5 kg CO2/kg material

Embodied Energy

19 MJ/kg 8.3 x 103 BTU/lb

Embodied Water

48 L/kg 5.7 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 to 120 MJ/m3

Resilience: Unit (Modulus of Resilience)

300 to 310 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

19 to 20 points

Strength to Weight: Bending

19 to 20 points

Thermal Diffusivity

14 mm2/s

Thermal Shock Resistance

16 to 17 points

Alloy Composition

Among cast alloy steels, the composition of EN 1.6220 steel is notable for containing a comparatively high amount of manganese (Mn). Manganese is used to improve hardenability and surface quality.

Iron (Fe) 96.7 to 98.8
Manganese (Mn) 1.0 to 1.6
Nickel (Ni) 0 to 0.8
Silicon (Si) 0 to 0.6
Carbon (C) 0.17 to 0.23
Sulfur (S) 0 to 0.030
Phosphorus (P) 0 to 0.020

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

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