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EN 1.4659 (X1CrNiMoCuNW24-22-6) Stainless Steel

EN 1.4659 stainless steel is a superaustenitic (highly alloyed) stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the solution annealed (AT) condition. 1.4659 is the EN numeric designation for this material. X1CrNiMoCuNW24-22-6 is the EN chemical designation.

It has the highest ductility among wrought superaustenitic stainless steels. In addition, it has a very high tensile strength and a moderately high base cost.

The graph bars on the material properties cards below compare EN 1.4659 stainless steel to: wrought superaustenitic 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

260

Elastic (Young's, Tensile) Modulus

210 GPa 30 x 106 psi

Elongation at Break

49 %

Fatigue Strength

460 MPa 66 x 103 psi

Impact Strength: V-Notched Charpy

94 J 69 ft-lb

Poisson's Ratio

0.28

Shear Modulus

81 GPa 12 x 106 psi

Shear Strength

640 MPa 93 x 103 psi

Tensile Strength: Ultimate (UTS)

900 MPa 130 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

440 °C 830 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1480 °C 2690 °F

Melting Onset (Solidus)

1430 °C 2600 °F

Specific Heat Capacity

460 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

12 W/m-K 6.9 BTU/h-ft-°F

Thermal Expansion

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

1.9 % IACS

Otherwise Unclassified Properties

Base Metal Price

37 % relative

Density

8.2 g/cm3 510 lb/ft3

Embodied Carbon

6.5 kg CO2/kg material

Embodied Energy

89 MJ/kg 38 x 103 BTU/lb

Embodied Water

220 L/kg 26 gal/lb

Common Calculations

PREN (Pitting Resistance)

54

Resilience: Ultimate (Unit Rupture Work)

370 MJ/m3

Resilience: Unit (Modulus of Resilience)

550 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

31 points

Strength to Weight: Bending

25 points

Thermal Diffusivity

3.2 mm2/s

Thermal Shock Resistance

19 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4659 stainless steel is notable for including tungsten (W) and containing a comparatively high amount of manganese (Mn). Tungsten interacts with other alloying elements to a greater extent than usual, which makes it hard to broadly characterize its effects. Manganese is used to improve ductility at elevated temperatures. It also permits a higher nitrogen content than would otherwise be possible.

Iron (Fe) 35.7 to 45.7
Chromium (Cr) 23 to 25
Nickel (Ni) 21 to 23
Molybdenum (Mo) 5.5 to 6.5
Manganese (Mn) 2.0 to 4.0
Tungsten (W) 1.5 to 2.5
Copper (Cu) 1.0 to 2.0
Nitrogen (N) 0.35 to 0.5
Silicon (Si) 0 to 0.7
Phosphorus (P) 0 to 0.030
Carbon (C) 0 to 0.020
Sulfur (S) 0 to 0.010

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

Followup Questions

Similar Alloys

Further Reading

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

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

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

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

Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012

Corrosion of Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002

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

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