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EN 1.3955 (GX12CrNi18-11) Cast Stainless Steel

EN 1.3955 stainless steel is a duplex stainless steel formulated for casting. Cited properties are appropriate for the solution annealed (AT) condition. 1.3955 is the EN numeric designation for this material. GX12CrNi18-11 is the EN chemical designation.

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

The graph bars on the material properties cards below compare EN 1.3955 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

150 MPa 22 x 103 psi

Impact Strength: V-Notched Charpy

90 J 66 ft-lb

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

520 MPa 75 x 103 psi

Tensile Strength: Yield (Proof)

220 MPa 32 x 103 psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Maximum Temperature: Corrosion

410 °C 770 °F

Maximum Temperature: Mechanical

930 °C 1700 °F

Melting Completion (Liquidus)

1430 °C 2600 °F

Melting Onset (Solidus)

1380 °C 2520 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.8 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

16 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

3.2 kg CO2/kg material

Embodied Energy

45 MJ/kg 19 x 103 BTU/lb

Embodied Water

140 L/kg 17 gal/lb

Common Calculations

PREN (Pitting Resistance)

19

Resilience: Ultimate (Unit Rupture Work)

95 MJ/m3

Resilience: Unit (Modulus of Resilience)

130 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

18 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

4.1 mm2/s

Thermal Shock Resistance

15 points

Alloy Composition

Among cast stainless steels, the composition of EN 1.3955 stainless steel is notable for containing a comparatively high amount of nickel (Ni). 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) 65.5 to 73.5
Chromium (Cr) 16.5 to 18.5
Nickel (Ni) 10 to 12
Manganese (Mn) 0 to 2.0
Silicon (Si) 0 to 1.0
Molybdenum (Mo) 0 to 0.75
Carbon (C) 0 to 0.15
Phosphorus (P) 0 to 0.045
Sulfur (S) 0 to 0.030

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