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Duplex Grades

Duplex stainless steels are extremely corrosion resistant, work hardenable alloys. Duplex stainless steel plate contains 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.

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

Stainless Steel Duplex Products

Stainless Steel Plate

Plate Mill Plate, Diamond Plate More Information 

Stainless Steel Sheet

2B/2D Finish, Polished Sheet, Perforated Sheet, Flat & Expanded  More Information

Stainless Steel Bar

Round Bar, Square Bar, Hex Bar, Rolled Flat. Sheared&Edged, Half Round  More Information

Stainless Steel Structural

Angles, Unequal Leg, Channel, Beams, Ornamental Square Tube, Ornamental Round Tube, Ornamental Rectangular Tube  More Information

Stainless Steel Tubular

Seamless Pipe, Welded Pipe, Seamless Tube, Seamless Tube  More Information

Please contact us directly with technical questions.

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

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

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

Please contact us directly with technical questions.

Call us at 1-800-222-6144 for more information