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EN 1.7221 (G26CrMo4) Cast Steel

EN 1.7221 steel is an alloy steel formulated for casting. 1.7221 is the EN numeric designation for this material. G26CrMo4 is the EN chemical designation.

It has a moderately low embodied energy among cast alloy steels. In addition, it can have a moderately low ductility and has a fairly low base cost.

The properties of EN 1.7221 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 1.7221 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

200 to 230

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

11 to 17 %

Fatigue Strength

290 to 390 MPa 41 to 56 x 103 psi

Impact Strength: V-Notched Charpy

20 to 38 J 15 to 28 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

650 to 780 MPa 94 to 110 x 103 psi

Tensile Strength: Yield (Proof)

430 to 630 MPa 62 to 91 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

420 °C 790 °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

44 W/m-K 26 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

2.4 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.5 kg CO2/kg material

Embodied Energy

20 MJ/kg 8.5 x 103 BTU/lb

Embodied Water

51 L/kg 6.1 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

83 to 98 MJ/m3

Resilience: Unit (Modulus of Resilience)

490 to 1050 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

23 to 27 points

Strength to Weight: Bending

21 to 24 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

19 to 23 points

Alloy Composition

Among cast alloy steels, the composition of EN 1.7221 steel is notable for containing comparatively high amounts of chromium (Cr) and manganese (Mn). Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures). Manganese is used to improve hardenability and surface quality.

Iron (Fe) 96.8 to 98.3
Chromium (Cr) 0.8 to 1.2
Manganese (Mn) 0.5 to 0.8
Silicon (Si) 0 to 0.6
Carbon (C) 0.22 to 0.29
Molybdenum (Mo) 0.15 to 0.3
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