MakeItFrom.com
Menu (ESC)

EN 1.3940 (GX2CrNiN18-13) Cast Stainless Steel

EN 1.3940 stainless steel is a duplex stainless steel formulated for casting. Cited properties are appropriate for the solution annealed (AT) condition. 1.3940 is the EN numeric designation for this material. GX2CrNiN18-13 is the EN chemical designation.

It has a moderately high ductility among cast duplex stainless steels. In addition, it has a moderately low tensile strength and a moderately low embodied energy.

The graph bars on the material properties cards below compare EN 1.3940 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 28 x 106 psi

Elongation at Break

34 %

Fatigue Strength

190 MPa 28 x 103 psi

Impact Strength: V-Notched Charpy

130 J 95 ft-lb

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

540 MPa 78 x 103 psi

Tensile Strength: Yield (Proof)

240 MPa 35 x 103 psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Maximum Temperature: Corrosion

410 °C 780 °F

Maximum Temperature: Mechanical

930 °C 1710 °F

Melting Completion (Liquidus)

1420 °C 2590 °F

Melting Onset (Solidus)

1380 °C 2510 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.9 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

17 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

3.3 kg CO2/kg material

Embodied Energy

47 MJ/kg 20 x 103 BTU/lb

Embodied Water

150 L/kg 17 gal/lb

Common Calculations

PREN (Pitting Resistance)

20

Resilience: Ultimate (Unit Rupture Work)

150 MJ/m3

Resilience: Unit (Modulus of Resilience)

150 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

19 points

Thermal Diffusivity

4.1 mm2/s

Thermal Shock Resistance

16 points

Alloy Composition

Among cast stainless steels, the composition of EN 1.3940 stainless steel is notable for including nitrogen (N) and containing a comparatively high amount of nickel (Ni). Nitrogen has a substantial strengthening effect, but has a complex (frequently negative) relationship with corrosion resistance. Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion.

Iron (Fe) 64.2 to 71.4
Chromium (Cr) 16.5 to 18.5
Nickel (Ni) 12 to 14
Manganese (Mn) 0 to 2.0
Silicon (Si) 0 to 1.0
Nitrogen (N) 0.1 to 0.2
Phosphorus (P) 0 to 0.035
Carbon (C) 0 to 0.030
Sulfur (S) 0 to 0.020

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

Followup Questions

Similar Alloys

Further Reading

ISO 19960: Cast steels and alloys with special physical properties

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

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

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