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

	C	Cr	Cu	Fe	Mo	Mn	N	Ni	P	S	Si
Min	–	19.5	0.5	Balance	6.0	–	0.18	17.5	–	–	–
Max	0.02	20.5	1.0		6.5	1.0	0.22	18.5	0.030	0.010	0.8

UNS S31254 F44 254SMO Mechanical Properties

Mechanical (room temperature)	UTS	0.2% Proof Strength	Elongation	Reduction in Area	Hardness
		Min	Min	Min	Max
	650-850 Mpa	300 Mpa	35.00%	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