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EN 1.4347 (GX4CrNiN26-7) Cast Stainless Steel

EN 1.4347 stainless steel is a duplex stainless steel formulated for casting. Cited properties are appropriate for the solution annealed (AT) condition. 1.4347 is the EN numeric designation for this material. GX4CrNiN26-7 is the EN chemical designation.

It has a moderately low base cost and a moderately low embodied energy among cast duplex stainless steels.

The graph bars on the material properties cards below compare EN 1.4347 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

200 GPa 29 x 106 psi

Elongation at Break

23 %

Fatigue Strength

320 MPa 47 x 103 psi

Impact Strength: V-Notched Charpy

34 J 25 ft-lb

Poisson's Ratio

0.27

Shear Modulus

79 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

660 MPa 96 x 103 psi

Tensile Strength: Yield (Proof)

480 MPa 69 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)

1410 °C 2580 °F

Melting Onset (Solidus)

1370 °C 2500 °F

Specific Heat Capacity

490 J/kg-K 0.12 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.7 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.1 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

16 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

3.1 kg CO2/kg material

Embodied Energy

44 MJ/kg 19 x 103 BTU/lb

Embodied Water

170 L/kg 20 gal/lb

Common Calculations

PREN (Pitting Resistance)

28

Resilience: Ultimate (Unit Rupture Work)

140 MJ/m3

Resilience: Unit (Modulus of Resilience)

570 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

24 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

4.0 mm2/s

Thermal Shock Resistance

19 points

Alloy Composition

Among cast stainless steels, the composition of EN 1.4347 stainless steel is notable for containing a comparatively high amount of chromium (Cr) and including nitrogen (N). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Nitrogen has a substantial strengthening effect, but has a complex (frequently negative) relationship with corrosion resistance.

Iron (Fe) 62.2 to 69.4
Chromium (Cr) 25 to 27
Nickel (Ni) 5.5 to 7.5
Manganese (Mn) 0 to 1.5
Silicon (Si) 0 to 1.5
Nitrogen (N) 0.1 to 0.2
Carbon (C) 0 to 0.050
Phosphorus (P) 0 to 0.035
Sulfur (S) 0 to 0.020

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

Followup Questions

Similar Alloys

Further Reading

EN 10283: Corrosion resistant steel castings

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