1.4547 – 254SMO – S31254
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UR™ 254 is a 18% Ni, 20% Cr, 6% Mo super austenitic stainless steel grade with 0.2% nitrogen additions, particularly designed to be cost effective. The 18% nickel and 0.7% copper additions combined with the chromium and molybdenum additions enhance the performance of the steel in many corrosive solutions encountered for example in chemical and petrochemical processes or chloride containing solutions.
The alloy is also seawater resistant and has extensively been used in offshore applications (It is not recommended for use in stagnant seawater applications with temperatures higher than 30°C (86°F).
Thanks to the 18% Nickel and the 0.2 Nitrogen additions, the microstructure is austenitic.
|> EURONORM :||EN 1.4547||X1 Cr Ni Mo Cu 20-18-7|
|> ASTM :||UNS S31254|
The high chromium, molybdenum and nitrogen contents of alloy UR™ 254 (PREN ≥ 42) explain why the grade is resistant to localized corrosion even in acidified oxidizing environments.
The alloy has been successfully used for seawater applications. Thanks to its well-balanced composition with 18% nickel and high chromium molybdenum and nitrogen additions, UR™ 254 alloy is a typical multipurpose super austenitic grade for severe service conditions.
It outperforms alloy UR™ 904L (UNS N08904) in most applications. Alloy UR™ 254 is not designed for concentrated sulfuric acid solutions. It contains 6% Mo but less nickel than the other grades of the 6 Mo family.
• Natural and treated seawater systems, desalination plants
• Pollution control : smelters (ductings, chimneys linings...)
• Bleaching equipment for pulp and paper industries (washers)
• Chemical industries : chloride containing media; phosphoric acid, sulphuric acid - Fine chemical production