Stainless steel
EU
1.4547 - X1CrNiMoCuN20-18-7 - 254SMO - Z1 CNDU 20.18.06Az
US
UNS S31254 - F44
High alloy austenitic stainless steel. Excellent corrosion resistance, good mechanical properties and weldability. Mainly used for equipment in marine settings, as well as other tough chloride-rich environments. Annealing must take place at around 1150 °C (2102°F) before quickly being cooled down with water. Subsequent strain hardening can improve this steel’s mechanical properties.
F44 - 254 SMO Stainless steel - 1.4547 - Available from stock
The 1.4547 alloy, also known by the names X1CrNiMoCuN20-18-7, 254 SMO and UNS S31254, is an austenitic stainless steel specially designed to offer a combination of high corrosion resistance, good mechanical properties and excellent weldability. Its composition makes it particularly suitable for maritime applications and in other harsh chloride-rich environments.
Technical summary of this steel:
- Europe: 1.4547 | X1CrNiMoCuN20-18-7 | 254SMO | Z1 CNDU 20.18.06Az
- USA: UNS S31254 | F44
- Europe: EN 10028-7 | EN 10088-1, 2, 3, 4, 5 | EN 10216-5 | EN 10217-7 | EN 10222-5 | EN 10250-4 | EN 10253-3 | EN 10253-4 | EN 10272 | EN 10296-2 | EN 13445-2 | EN 1380-2 | EN 10297-2 | EN 10312 | EN ISO 15510 | NACE MR 0175/ISO 15156-3 | NACE MR0103/ISO 17945
- USA: ASTM A276, A479 | ASTM A182, A403, A473| ASTM A240 , A480 | ASTM A193, A194
- Exceptional corrosion resistance in a wide range of environments, including in marine and chloride settings, outperforming many conventional stainless steels.
- Good mechanical characteristics, which can also be strengthened via strain hardening.
- Good weldability: this alloy can be easily welded without any need for preheating, offering good crack resistance.
- Annealing: in order to restore the austenitic structure and maximise corrosion resistance, annealing must take place around 1150°C, before being quickly cooled down with water.
- Strain hardening: a technique used to improve an alloy’s mechanical properties, increasing its strength.
Properties
- Exceptional corrosion resistance in a wide range of environments, including in marine and chloride settings, outperforming many conventional stainless steels.
- Good mechanical characteristics, which can also be strengthened via strain hardening.
- Good weldability: this alloy can be easily welded without any need for preheating, offering good crack resistance.
Standards and Designations
Heat treatment
- Annealing: in order to restore the austenitic structure and maximise corrosion resistance, annealing must take place around 1150°C, before being quickly cooled down with water.
- Strain hardening: a technique used to improve an alloy’s mechanical properties, increasing its strength.
Special advantages
Conclusion
Application
- Maritime industry: used in shipbuilding and for components exposed to seawater.
- Harsh environments: suitable for heat exchangers, desalination systems and chemical treatment facilities in chloride-rich environments.
- The 1.4547/254 SMO alloy is known for its ability to resist corrosion even in extremely corrosive conditions, coupled with good mechanical strength and excellent weldability, making it an ideal choice for critical applications where durability and reliability are required.
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