Duplex stainless steels are finding increased application in the chemical, oil and gas industries, petrochemical process plants, the pulp & paper industry, pollution control equipment, transportation and for general engineering thanks to their outstanding corrosion resistance and mechanical properties.

Super duplex (25% chromium) stainless steel alloy in a variety of forms is important. For example, bars, forgings, castings, sheets, plates, pipes/tubes, welding consumables, flanges, fittings, dished ends and fasteners are available. In terms of other benefits, the high allowable design stress of this alloy type in comparison with other duplex stainless steels and austenitic stainless steels, including 6% Mo type, is significant. It also offers excellent castability, weldability and machinability. These features are complemented by excellent fatigue resistance and galvanic compatibility with other high alloy stainless steels.

MATERIALS				MECHANICAL CHARACTERISTICS
Grade	ASTM Plates	UNS	W.N.	Tensile Strength min N/mm2	Yield Point min N/mm2	Elongation 2" min%	Hardness Max HB	Hardness Max HRB
254 SMO	A240	S31254	1.4547	650	300	35	223	96
2304 DUPLEX	A240	S32304	1.4362	600	400	25	290	-
2205 DUPLEX	A240	S31803	1.4462	620	450	25	290	-
2507 Superduplex	A240	S32750	1.4410	795	550	15	310	-