Special Ferritic Steels
X2CrNiCuN23-4 – 1.4655
X2CrNiCuN23-4 – 1.4655 stainless steel is an advanced duplex (dual-phase) stainless steel, combining both austenitic and ferritic microstructures. It is specifically developed for applications requiring high mechanical strength, enhanced corrosion resistance, and chemical stability. The addition of alloying elements such as copper (Cu) and nitrogen (N) provides a more balanced and high-performance structure compared to standard duplex grades.
The chemical composition typically includes approximately 22–24% chromium, 4–6% nickel, along with controlled amounts of nitrogen and copper. The high chromium content forms a strong passive oxide layer, ensuring excellent resistance to corrosion. Nitrogen enhances both mechanical strength and resistance to pitting corrosion, while copper improves performance in acidic environments. This combination makes 1.4655 particularly suitable for aggressive chemical conditions.
One of the key advantages of X2CrNiCuN23-4 stainless steel is its high yield strength, which can be up to twice that of conventional austenitic stainless steels. This allows for the use of thinner sections while maintaining the same structural integrity, resulting in both weight and cost savings.
In terms of corrosion resistance, this grade performs exceptionally well in chloride-containing environments and chemical processing systems. It also offers strong resistance to stress corrosion cracking, making it highly suitable for marine and offshore applications.
Mechanically, it provides high strength combined with adequate ductility. Its weldability is good, although proper welding techniques must be applied to maintain the duplex structure and ensure optimal performance.
Overall, X2CrNiCuN23-4 – 1.4655 stainless steel delivers a high-performance combination of strength, durability, and corrosion resistance, making it a reliable solution for demanding engineering applications.
Main Application Areas
- Chemical and petrochemical plants
- Marine and offshore applications
- Equipment used in acidic environments
- Pressure vessels and tank systems
- Pipelines and fluid handling systems
- Energy sector equipment
- Water treatment and desalination plants
- Automotive and heavy industry applications
- Special engineering projects requiring high strength and corrosion resistance
Thanks to these properties, X2CrNiCuN23-4 – 1.4655 stainless steel is widely recognized as a high-performance engineering material, suitable for long-lasting and reliable operation in harsh environments.
General Identity
X2CrNiCuN23-4 – 1.4655
| Grade |
X2CrNiCuN23-4 |
| Number |
1.4655 |
| Classification |
Austenitic-Ferritic Stainless Steel – Special Grade |
Standards
X2CrNiCuN23-4 – 1.4655
| Standard 1 |
EN 10088-1: 2005 |
| Standard 2 |
EN 10088-2: 2005 |
Chemical Composition
X2CrNiCuN23-4 – 1.4655
| C |
max 0.080 |
| Si |
max 1.00 |
| Mn |
max 1.00 |
| Ni |
3.5 – 5.5 |
| P |
max 0.035 |
| S |
max 0.015 |
| Cr |
22 – 24 |
| Mo |
0.1 – 0.6 |
| N |
0.05 – 2 |
| Cu |
1 – 3 |
Mechanical Properties
X2CrNiCuN23-4 – 1.4655
| Rm – Tensile strength (MPa) (+A) |
600 – 850 |
| Rp0.2 0.2% proof strength (MPa) (+A) |
400 – 420 |
| A – Min. elongation at fracture (%) (+A) |
20 – 25 |
