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EN 1.4469 (GX2CrNiMoN26-7-4) Cast Stainless Steel

EN 1.4469 stainless steel is a duplex stainless steel formulated for casting. Cited properties are appropriate for the solution annealed (AT) condition. 1.4469 is the EN numeric designation for this material. GX2CrNiMoN26-7-4 is the EN chemical designation.

The graph bars on the material properties cards below compare EN 1.4469 stainless steel to: cast duplex stainless 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

Elastic (Young's, Tensile) Modulus

210 GPa 30 x 106 psi

Elongation at Break

25 %

Fatigue Strength

380 MPa 55 x 103 psi

Impact Strength: V-Notched Charpy

56 J 41 ft-lb

Poisson's Ratio

0.27

Shear Modulus

81 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

740 MPa 110 x 103 psi

Tensile Strength: Yield (Proof)

550 MPa 79 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

450 °C 840 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1450 °C 2640 °F

Melting Onset (Solidus)

1400 °C 2550 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

17 W/m-K 9.8 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.5 % IACS

Otherwise Unclassified Properties

Base Metal Price

21 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

4.1 kg CO2/kg material

Embodied Energy

57 MJ/kg 24 x 103 BTU/lb

Embodied Water

180 L/kg 22 gal/lb

Common Calculations

PREN (Pitting Resistance)

42

Resilience: Ultimate (Unit Rupture Work)

170 MJ/m3

Resilience: Unit (Modulus of Resilience)

730 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

26 points

Strength to Weight: Bending

23 points

Thermal Diffusivity

4.6 mm2/s

Thermal Shock Resistance

20 points

Alloy Composition

Among cast stainless steels, the composition of EN 1.4469 stainless steel is notable for containing a comparatively high amount of chromium (Cr) and including copper (Cu). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Copper is primarily used to improve resistance to acids.

Iron (Fe) 56.4 to 65.9
Chromium (Cr) 25 to 27
Nickel (Ni) 6.0 to 8.0
Molybdenum (Mo) 3.0 to 5.0
Copper (Cu) 0 to 1.3
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 1.0
Nitrogen (N) 0.12 to 0.22
Phosphorus (P) 0 to 0.035
Carbon (C) 0 to 0.030
Sulfur (S) 0 to 0.025

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

Followup Questions

Similar Alloys

Further Reading

ISO 11972: Corrosion-resistant cast steels for general applications

EN 10283: Corrosion resistant steel castings

ISO 4991: Steel castings for pressure purposes

Duplex Stainless Steels, Iris Alvarez-Armas and Suzanne Degallaix-Moreuil (editors), 2009

Duplex Stainless Steels: Microstructure, Properties and Applications, Robert N. Gunn (editor), 1997

Corrosion of Stainless Steels, A. John Sedriks, 1996

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015