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EN 1.4539 (X1NiCrMoCu25-20-5) Stainless Steel

EN 1.4539 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. 1.4539 is the EN numeric designation for this material. X1NiCrMoCu25-20-5 is the EN chemical designation.

It has a moderately low base cost and a moderately low embodied energy among wrought superaustenitic stainless steels.

The graph bars on the material properties cards below compare EN 1.4539 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

200

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

38 %

Fatigue Strength

220 MPa 31 x 103 psi

Impact Strength: V-Notched Charpy

90 J 67 ft-lb

Poisson's Ratio

0.28

Shear Modulus

79 GPa 11 x 106 psi

Shear Strength

430 MPa 62 x 103 psi

Tensile Strength: Ultimate (UTS)

630 MPa 91 x 103 psi

Tensile Strength: Yield (Proof)

260 MPa 37 x 103 psi

Thermal Properties

Latent Heat of Fusion

300 J/g

Maximum Temperature: Corrosion

420 °C 800 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1440 °C 2620 °F

Melting Onset (Solidus)

1390 °C 2540 °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

31 % relative

Density

8.1 g/cm3 500 lb/ft3

Embodied Carbon

5.7 kg CO2/kg material

Embodied Energy

78 MJ/kg 34 x 103 BTU/lb

Embodied Water

200 L/kg 24 gal/lb

Common Calculations

PREN (Pitting Resistance)

36

Resilience: Ultimate (Unit Rupture Work)

190 MJ/m3

Resilience: Unit (Modulus of Resilience)

160 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

22 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

3.2 mm2/s

Thermal Shock Resistance

14 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.4539 stainless steel is notable for containing a comparatively high amount of nickel (Ni) and including copper (Cu). Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion. Copper is used to improve resistance to acids, and to improve formability.

Iron (Fe) 43.1 to 51.8
Nickel (Ni) 24 to 26
Chromium (Cr) 19 to 21
Molybdenum (Mo) 4.0 to 5.0
Copper (Cu) 1.2 to 2.0
Manganese (Mn) 0 to 2.0
Silicon (Si) 0 to 0.7
Nitrogen (N) 0 to 0.15
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 10272: Stainless steel bars for pressure purposes

EN 10250-4: Open die steel forgings for general engineering purposes - Part 4: Stainless steels

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

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

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015