MakeItFrom.com
Menu (ESC)

EN 1.4424 (X2CrNiMoSi18-5-3) Stainless Steel

EN 1.4424 stainless steel is a duplex stainless steel formulated for primary forming into wrought products. 1.4424 is the EN numeric designation for this material. X2CrNiMoSi18-5-3 is the EN chemical designation.

It has a fairly low thermal conductivity among the wrought duplex stainless steels in the database.

The properties of EN 1.4424 stainless steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.4424 stainless steel to: wrought 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

Brinell Hardness

230

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

28 %

Fatigue Strength

350 to 370 MPa 51 to 53 x 103 psi

Impact Strength: V-Notched Charpy

90 to 91 J 67 ft-lb

Poisson's Ratio

0.28

Shear Modulus

78 GPa 11 x 106 psi

Shear Strength

520 MPa 75 x 103 psi

Tensile Strength: Ultimate (UTS)

800 MPa 120 x 103 psi

Tensile Strength: Yield (Proof)

480 to 500 MPa 70 to 73 x 103 psi

Thermal Properties

Latent Heat of Fusion

310 J/g

Maximum Temperature: Corrosion

420 °C 780 °F

Maximum Temperature: Mechanical

960 °C 1750 °F

Melting Completion (Liquidus)

1430 °C 2610 °F

Melting Onset (Solidus)

1390 °C 2530 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

13 W/m-K 7.5 BTU/h-ft-°F

Thermal Expansion

12 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

15 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

3.4 kg CO2/kg material

Embodied Energy

46 MJ/kg 20 x 103 BTU/lb

Embodied Water

140 L/kg 17 gal/lb

Common Calculations

PREN (Pitting Resistance)

29

Resilience: Ultimate (Unit Rupture Work)

190 to 200 MJ/m3

Resilience: Unit (Modulus of Resilience)

580 to 640 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

29 points

Strength to Weight: Bending

25 points

Thermal Diffusivity

3.5 mm2/s

Thermal Shock Resistance

23 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4424 stainless steel is notable for containing comparatively high amounts of silicon (Si) and manganese (Mn). Silicon content is typically governed by metallurgical processing concerns, but it can also be added for the purpose of improving oxidation resistance. Manganese is used to improve ductility at elevated temperatures. It also permits a higher nitrogen content than would otherwise be possible.

Iron (Fe) 68.6 to 72.4
Chromium (Cr) 18 to 19
Nickel (Ni) 4.5 to 5.2
Molybdenum (Mo) 2.5 to 3.0
Silicon (Si) 1.4 to 2.0
Manganese (Mn) 1.2 to 2.0
Nitrogen (N) 0.050 to 0.1
Phosphorus (P) 0 to 0.035
Carbon (C) 0 to 0.030
Sulfur (S) 0 to 0.015

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

Followup Questions

Similar Alloys

Further Reading

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

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

EN 10088-2: Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes

EN 10088-3: Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes

Welding Metallurgy and Weldability of Stainless Steels, John C. Lippold and Damian J. Kotecki, 2005

EN 10088-1: Stainless steels - Part 1: List of stainless steels

Corrosion of Stainless Steels, A. John Sedriks, 1996

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