Duplex stainless steel Grade

Duplex stainless steels are extremely corrosion resistant, work hardenable alloys. Duplex stainless steel pipes contain relatively high levels of chromium (between 18% and 28%) and low to moderate amounts of nickel (between 1.5% and 8%). The high corrosion resistance and excellent mechanical properties of duplex stainless steels can be attributed to their chemical composition and balanced (duplex) microstructure of approximately equal volume percentages of ferrite and austenite. Because of this duplex nature, it will display properties characteristic of both austenitic and ferritic stainless steels. Duplex stainless steels are in most cases, tougher than ferritic stainless steels. Strengths of duplex stainless steels can in some cases be double that for austenitic stainless steels.

Product Forms

wilsonpipeline Stainless stocks the following products in Duplex stainless steel Grade:

Stainless Steel 400 Series Products
Super Duplex Stainless Steel Flanges	Duplex S31803 F51 flange,Duplex Steel S31803 SO Flange, NSI ASME JIS DIN super duplex stainless steel flanges,etc.	More Information
Stainless Steel Flanges	Stainless Steel Welding Neck Flange (WN),316L Stainless Steel Flange, 317 Stainless Steel Flange,347 Stainless Steel Flange,etc.	More Information
Stainless Steel Pipe Fittings	DUPLEX S32750 (SAF 2507) Pipe Elbow,904L Pipe SR/LR Elbow, Stainless Steel 304 Elbow,347H PIPE FITTING,etc.	More Information
Stainless Steel Pipes	304L 316L Large Diameter Stainless Steel Seamless Pipes, 316L/321/304 Cold Drawn Seamless Tube GOST 9941-91, ASTM A269 STPG42 G3456 SCH4O Seamless Stainless Steel Pipes  AP/BA Welded Cold Drawn Pipe	More Information
Gaskets	Serrated gasket with outer ring SS316,Spiral serrated metal gasket, Basic type serrated gasket,etc.	More Information

Please contact us directly with technical questions .

Common Applications

Due to their high strength and corrosion resistance properties, Duplex Stainless Steels are used in a variety of applications such as:

• Pressure vessels, reactor tanks and heat exchangers

• Desalination plants and seawater systems

• Water transmission pipes

• Rotors, impellers and shafts in industrial equipment

•Stock washers and other equipment for the pulp and paper industry

• Absorber towers, FGD systems for air pollution control

• Phosphoric acid production

• Food, oil and gas, mining and architectural applications

• Biofuels plants

Advantages

Duplex Stainless Steels combine many of the beneficial properties of ferritic and austenitic materials to provide both high strength and good corrosion resistance. Due to their high chromium, molybdenum and nitrogen contents and duplex structure, these steels offer many benefits in comparison to 300 series austenitic grades:

• High Strength – Approximately twice the level of austenitics

• Good resistance to pitting and crevice corrosion

• Excellent resistance to stress- corrosion cracking

• Good erosion and fatigue resistance

• Good weldability and increased heat transfer

• More stable pricing due to lower Ni levels than austenitic stainless grades

Duplex Case Studies

Duplex Case Studies
Pulp and Paper Mill Case Studies	Grades references include Duplex 2205, LDX 2101,  Super Duplex 2507 and Duplex 2304.  Products Referenced include Pulp and Paper  Mill Pressure Vessels, Digesters, and Storage Tanks.	See Case Study
Duplex Usage in Desalination Plants	Grades referenced include Duplex 2205,  LDX 2101, and Duplex 2304, SAF 2507	See Case Study
Duplex Usage in Oil and Gas Industry	Grades referenced include Duplex 2205,  SAF 2906, 3207HD, Super Duplex 2507, LDX 2101, L2003.	See Case Study

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