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2304 Duplex Stainless Steel Sheet & Plate

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Duplex 2304 Stainless Steel Sheet & Plate (UNS S32304,1.4362)

Duplex 2304 Stainless Steel Sheet & Plate (UNS S32304, 1.4362) is a lean duplex stainless steel offering a balance of strength, corrosion resistance, and cost efficiency. Its duplex microstructure, comprising roughly equal parts austenite and ferrite, provides higher mechanical strength than standard austenitic stainless steels while maintaining good corrosion resistance. The low nickel and molybdenum content make it an economical alternative to other duplex grades. Widely used in structural, chemical, and marine applications, Duplex 2304 is particularly suitable for environments requiring moderate corrosion resistance and strength.

 

Key Properties Duplex 2304 Stainless Steel Sheet & Plate

  • Corrosion Resistance: Excellent resistance to general corrosion, stress corrosion cracking, and localized attacks like pitting and crevice corrosion in mild to moderate chloride environments.
  • Mechanical Strength: About twice the yield strength of austenitic stainless steels like 304 or 316, reducing the need for thicker sections and saving material costs.
  • Durability: Good toughness and ductility even at low temperatures, with resistance to fatigue and wear.
  • Weldability: Easily welded using standard techniques, with minimal risk of cracking when proper practices are followed.

 

Technical Specifications

  • UNS: S32304
  • DIN: 1.4362

Available Thickness

3/16″1/4″5/16″3/8″1/2″
4.8mm6.3mm7.9mm9.5mm12.7mm
5/8″3/4″1″1 1/4″1 1/2″
15.9mm19mm25.4mm31.8mm38.1mm
2304-duplex-stainless-steel-sheet-plate

Application

  • Automotive
  • Chemical and Pharmaceutical
  • Fertilizer
  • Food Processing and Handling
  • Manufacturing
  • Mining
  • Oil & Gas
  • Phosphate Mining

Standard

  • ASTM A240 / A240M
  • ASTM A276 / A276M
  • ASTM A312 / A312M
  • ISO 15510
  • EN 10088-2
  • IN 10204
  • HE G4304
  • HE G4305
  • ASME SA240 / SA240M

Duplex 2304 Worldwide Equivalent Grade

CountryStandard NameEquivalent Grade
United StatesASTM A240UNS S32304
EuropeEN 10088-2X2CrNiMoN22-5-3
GermanyDIN1.4162
United KingdomBS2338S
FranceNFZ3CND22-5-3
ItalyUNI1.4362
JapanJISSUS 329J1
ChinaGBS32304

Corrosion Resistance

  • Chloride-Induced Corrosion: It exhibits excellent resistance to chloride stress corrosion cracking, which is a common issue in environments with high chloride levels, such as coastal areas and chemical processing facilities.
  • Pitting and Crevice Corrosion: The alloy’s high chromium and molybdenum content enhances its resistance to pitting and crevice corrosion, often encountered in seawater and acidic environments.

Duplex 2304 Chemical Composition

Element% Range
Chromium (Cr)21.0 – 23.0
Nickel (Ni)1.0 – 1.5
Molybdenum (Mo)0.0 – 0.5
Nitrogen (N)0.10 – 0.20
Carbon (C)0.03 max
Manganese (Mn)5.0 – 7.0

Duplex 2304 Physical Properties

PropertyValue
Density~7.8 g/cm³
Melting Point~1400 – 1450°C
Thermal Conductivity~16 W/m·K
Electrical Resistivity~0.6 × 10⁻⁶ Ω·m
Young’s Modulus~200 GPa
Poisson’s Ratio~0.3

Duplex 2304 Mechanical Properties

PropertyValue
Tensile Strength550 – 650 MPa
Yield Strength350 – 450 MPa
Elongation25 – 30%
Hardness (Rockwell B)85 – 90 HB
Impact ToughnessGood at room temperature

Fabrication Data

  • Welding: Can be welded using standard methods such as TIG, MIG, and MMA, but preheating and post-weld heat treatment may be necessary to avoid issues like cracking.
  • Machining: Machining can be challenging due to its hardness and strength; use of sharp tools and appropriate cutting speeds is recommended.
  • Forming: Hot forming is generally preferred over cold forming to avoid work hardening and reduce the risk of cracking.
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