EN 1.4565 (X2CrNiMnMoN25-18-6-5) Stainless Steel
EN 1.4565 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. 1.4565 is the EN numeric designation for this material. X2CrNiMnMoN25-18-6-5 is the EN chemical designation.
It has a very low base cost among wrought superaustenitic stainless steels. In addition, it has a very low embodied energy and a moderately high electrical conductivity.
The graph bars on the material properties cards below compare EN 1.4565 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
Elastic (Young's, Tensile) Modulus
210 GPa 30 x 106 psi
Elongation at Break
35 %
Fatigue Strength
380 MPa 55 x 103 psi
Impact Strength: V-Notched Charpy
110 J 82 ft-lb
Poisson's Ratio
0.28
Shear Modulus
81 GPa 12 x 106 psi
Shear Strength
590 MPa 85 x 103 psi
Tensile Strength: Ultimate (UTS)
880 MPa 130 x 103 psi
Tensile Strength: Yield (Proof)
480 MPa 69 x 103 psi
Thermal Properties
Latent Heat of Fusion
310 J/g
Maximum Temperature: Corrosion
460 °C 850 °F
Maximum Temperature: Mechanical
1100 °C 2010 °F
Melting Completion (Liquidus)
1420 °C 2600 °F
Melting Onset (Solidus)
1380 °C 2510 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
12 W/m-K 6.9 BTU/h-ft-°F
Thermal Expansion
15 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
1.9 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.1 % IACS
Otherwise Unclassified Properties
Base Metal Price
28 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
5.4 kg CO2/kg material
Embodied Energy
74 MJ/kg 32 x 103 BTU/lb
Embodied Water
210 L/kg 25 gal/lb
Common Calculations
PREN (Pitting Resistance)
47
Resilience: Ultimate (Unit Rupture Work)
260 MJ/m3
Resilience: Unit (Modulus of Resilience)
550 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
31 points
Strength to Weight: Bending
26 points
Thermal Diffusivity
3.2 mm2/s
Thermal Shock Resistance
21 points
Alloy Composition
Among wrought stainless steels, the composition of EN 1.4565 stainless steel is notable for containing comparatively high amounts of manganese (Mn) and chromium (Cr). Manganese is used to improve ductility at elevated temperatures. It also permits a higher nitrogen content than would otherwise be possible. Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance.
| Fe | 41.2 to 50.7 | |
| Cr | 24 to 26 | |
| Ni | 16 to 19 | |
| Mn | 5.0 to 7.0 | |
| Mo | 4.0 to 5.0 | |
| Si | 0 to 1.0 | |
| N | 0.3 to 0.6 | |
| Nb | 0 to 0.15 | |
| C | 0 to 0.030 | |
| P | 0 to 0.030 | |
| S | 0 to 0.015 |
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
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