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EN 1.4446 (GX2CrNiMoN17-13-4) Cast Stainless Steel

EN 1.4446 stainless steel is an austenitic stainless steel formulated for casting. Cited properties are appropriate for the solution annealed (AT) condition. 1.4446 is the EN numeric designation for this material. GX2CrNiMoN17-13-4 is the EN chemical designation.

It has a moderately high electrical conductivity and a moderately low tensile strength among cast austenitic stainless steels.

The graph bars on the material properties cards below compare EN 1.4446 stainless steel to: cast austenitic 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

Brinell Hardness

140

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

23 %

Fatigue Strength

160 MPa 23 x 103 psi

Impact Strength: V-Notched Charpy

56 J 41 ft-lb

Poisson's Ratio

0.28

Shear Modulus

79 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

490 MPa 71 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

980 °C 1800 °F

Melting Completion (Liquidus)

1460 °C 2650 °F

Melting Onset (Solidus)

1410 °C 2570 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

14 W/m-K 7.8 BTU/h-ft-°F

Thermal Expansion

16 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

22 % relative

Density

7.9 g/cm3 500 lb/ft3

Embodied Carbon

4.5 kg CO2/kg material

Embodied Energy

60 MJ/kg 26 x 103 BTU/lb

Embodied Water

160 L/kg 19 gal/lb

Common Calculations

PREN (Pitting Resistance)

34

Resilience: Ultimate (Unit Rupture Work)

93 MJ/m3

Resilience: Unit (Modulus of Resilience)

140 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

17 points

Strength to Weight: Bending

17 points

Thermal Diffusivity

3.6 mm2/s

Thermal Shock Resistance

11 points

Alloy Composition

Among cast stainless steels, the composition of EN 1.4446 stainless steel is notable for containing comparatively high amounts of molybdenum (Mo) and nickel (Ni). Molybdenum is used to facilitate tempering. In addition, it offers modest bonuses to a wide range of material properties. 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) 59.7 to 66.9
Chromium (Cr) 16.5 to 18.5
Nickel (Ni) 12.5 to 14.5
Molybdenum (Mo) 4.0 to 4.5
Manganese (Mn) 0 to 1.5
Silicon (Si) 0 to 1.0
Nitrogen (N) 0.12 to 0.22
Phosphorus (P) 0 to 0.040
Carbon (C) 0 to 0.030
Sulfur (S) 0 to 0.030

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

Followup Questions

Similar Alloys

Further Reading

EN 10283: Corrosion resistant steel castings

Machining of Stainless Steels and Super Alloys: Traditional and Nontraditional Techniques, Helmi A. Youssef, 2016

Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984

Corrosion of Stainless Steels, A. John Sedriks, 1996

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