Strip, Coil, Foil, Wire, ASTM A240 

Applications 

Pulp and paper industry, caustic solutions, organic acids, food industry, pressure vessels 

Description 

Duplex Alloy 2304 is a two-phase, ferritic, austenitic 23% chromium, 4% nickel, molybdenum-free duplex stainless steel. It has similar corrosion resistance properties to 316L. Furthemore, its mechanical properties are twice those of 304L/316L austenitic grades. This allows the designer to save weight, particularly for properly designed pressure vessel applications. The alloy is partcularly suitable for applications covering the -50 °C/+300 °C temperature range. 

Chemistry Typical 

Carbon: 0.03 max 
Manganese: 2.50 max 
Phosphorus: 0.040 max 
Sulfur: 0.030 max 
Silicon: 1.00 max 
Chromium: 21.50 - 24.50 
Nickel: 2.00 - 5.50 
Copper: 0.05 - 0.60 
Molybdenum: 0.05 - 0.60 
Nitrogen: 0.05 - 0.20 
Iron: Balance 

Physical Properties 

Density: 0.284 lbs/in3 7 .86 g/cm3

Thermal Conductivity: BTU-ft/hr/ft2/°F (W/m-° K): 
At 68 - 212 °F (20 - 100 °C): 9.0 (17.0) 

Mean Coefficient of Thermal Expansion: in/in/°F (µm/m•K): 
32 - 212 °F: 6.97 x 10·6 (13.0) 

Modulus of Elasticity: ksi (MPa): 
29 x 103 (200 x 103) in tension 

Magnetic Permeability: Ferromagnetic 

Melting Point: 2570 - 2660 °F (1410 - 1460 °C) 

Forms 

Coil - Strip, Foil, Ribbon  Wire - Profile, Round, Flat, Square 

Mechanical Properties at Room Temperature 

Annealed Nominal 

Ultimate Tensile Strength: 11 0 KSI min (758 MPa min)
Yield Strength: (0.2% offset) 65 KSI min (448 MPa min)
Elongation: 30% min 

Tempered

Duplex Alloy 2304 can be cold rolled to various tempers. Contact Ulbrich Technical Service for additional information. 

Additional Properties

Corrosion Resistance

Refer to NACE (National Association of Corrosion Engineers) for recommendations. 

Finishes

# 1 - Hot rolled annealed and descaled. It is available in strip, foil and ribbon. It is used for applications where a smooth decorative finish is not required. 
# 2D - Dull finish produced by cold rolling, annealing and descaling. Used for deep drawn parts and those parts that need to retain lubricants in the forming process.  # 2B - Smooth finish produced by cold rolling, annealing and descaling. A light cold rolling pass is added after anneal with polished rolls giving it a brighter finish than 2D. 
#BA- Bright annealed cold rolled and bright annealed 
#CBA- Course bright annealed cold rolled matte finish and bright anneal 
#2 - Cold Rolled  # 2BA- Smooth finish produced by cold rolling and bright annealing. A light pass using highly polished rolls produces a glossy finish. A 2BA finish may be used for lightly formed applications where a glossy finish is desired in the formed part.  Polished - Various grit finish for specific polish finished requirements. 
* Not all finishes are available for all alloys - Contact Ulbrich Sales for more information.

Wire Finishes

XC - Extra clean bright annealed or bright annealed and cold rolled Grease - Ultra-bright finish (for decorative applications)  Soap - Soap is not removed from tempered wire to act as a lubricant. 

*Contact Ulbrich Wire for custom wire finishes.

Heat Treatment

Duplex Alloy 2304 cannot be hardened by heat treatment. 

Welding

For best results refer to: SSINA's "Welding of Stainless Steels and Other Joining Methods".  Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels & Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the 'applications' noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.

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