Duplex Alloy 2304 Stainless Steel Wire UNS S32304

Duplex alloy 2304 is a two-phase, ferritic-austenitic stainless steel that has similar corrosion resistance properties to alloy 316L with a yield strength almost twice those of alloys 304L/316L.

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Shaped, Flat, Square, Round, Fine Wire, Plated and Un-plated ASTM A240

Duplex Alloys 2304 Alloy Description

Duplex alloy 2304 is a two-phase, ferritic-austenitic stainless steel. It has similar corrosion resistance properties to alloy 316L with a yield strength almost twice those of alloys 304L/316L. This allows the designer to save weight, particularly for properly designed pressure vessel applications. The alloy is particularly suitable for applications covering the -50°C/+300°C temperature range.


Screens and other components for the pulp and paper industry
Food processing equipment


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)
68-212ºF (20-100ºC): 9.0 (17.0)

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

Modulus of Elasticity: KSI (MPa)
29.0x 10³ (200 x 10³) in tension

Magnetic Permeability: Ferromagnetic

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

Annealed Nominal

Ultimate Tensile Strength: 110 KSI min (758 MPa min)
Yield Strength: (0.2% offset) 65 KSI min (448 MPa min)
Elongation: 30% min

Properties Tempered

Duplex alloy 2304 can be cold rolled to achieve the temper properties required by specific customers and/or manufacturing requirements. Contact Ulbrich Wire for details.

Additional Properties

Corrosion Resistance

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

Standard Wire Finishes

Extra Clean: Extra clean is also referred to as “bright annealed” or “bright annealed and cold

Grease (round wire only): Drawn in a heavy grease produces an “Ultra bright” finish for decorative applications

Soap (round wire only): Soap is used as a lubricant in the drawing process and is not removed. It acts as a lubricant during customer part forming operation. A soap finish is available in tempered products.
Plated: Many plating options are available.
*Special finishes are available: Contact Ulbrich Wire Sales with special finish and plating requests.


Continuous Coils
Cut to lengths
Precision cutting

Heat Treatment

Duplex alloy 2304 cannot be hardened by heat treatment


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 and 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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