UNS S31254 F44

A fully austenitic alloy with excellent corrosion resistance in a wide variety of aggressive, aqueous environments, widely used in the chemical processing and power industry for piping.

F44 is also known as 254 SMO® *, 1.4547 and SS2378.

Related specifications:

ASTM A479UNS S31254

Same day quote, next day dispatch

254SMO is an austenitic stainless steel, hmo steel, 254SMO corresponds to the domestic material S31254, one of the reasons why the increased corrosion resistance of 254SMO austenitic stainless steel makes it an excellent choice in critical, high stress or high temperature applications where component failure can be catastrophic.

254SMO austenitic stainless steel is a solid solution strengthening material with excellent high temperature strength and easy machine adding at room temperature. Ideal for long-term applications at 649°C and higher temperatures, operating time much longer than stainless steel and nickel alloys. The 254SMO Austenitic stainless steel material is a complete austenitic nickel-based alloy with 22% chromium. The nickel it contains also helps protect the alloy from the corrosion of halides such as chloride and fluoride when subjected to extreme heat. The excellent weldability characteristics are associated with the slow precipitation characteristic of the primary strengthened gamma double bottom phase. Typical aerospace applications of 254SMO austenitic stainless steel materials include compressor and turbine discs, blades, spacers and bolts for jet engines, and liquid rocket parts involving low temperatures.

F44 is an austenitic stainless steel used in seawater and other aggressive chloride-bearing media. This grade has excellent resistance to pitting and crevice corrosion, high resistance to general corrosion and stress corrosion cracking, with a higher strength than conventional austenitic stainless steels, and good weldability.

We hold F44 round bar stock from 12.7mm to 189mm, although we can supply additional sizes on competitive lead times.

UNS S31254 F44 254SMO Chemical Properties


UNS S31254 F44 254SMO Mechanical Properties

Mechanical (room temperature)UTS0.2% Proof StrengthElongationReduction in AreaHardness
650-850 Mpa300 Mpa35.00%50.00%260 HB

254SMO Applications:​

F44 is ideally suited to applications within the chemical and food processing industry, marine and offshore environments and the paper manufacturing industry.

Typical end uses include:

paper bleaching vats
pollution control systems
piping and condensers
pumps and valves
heat exchangers
chemical proccessing equipment