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.
| Fe | 96.7 to 98.8 | |
| Mn | 1.0 to 1.6 | |
| Ni | 0 to 0.8 | |
| Si | 0 to 0.6 | |
| C | 0.17 to 0.23 | |
| S | 0 to 0.030 | |
| 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