UNS S32654 - EN 1.4539

S32654. also known as 1.4539 or UNS S32654. is a super duplex stainless steel (SDSS) with a higher percentage of chromium, nickel, molybdenum, and nitrogen compared to standard duplex stainless steels. It offers superior corrosion resistance, particularly in aggressive environments such as seawater, chloride solutions, and sulfuric acid.

National rules model：

Unified Numbering System (UNS): S32654

American Society for Testing and Materials (ASTM): ASTM A240/A240M S32654

European Norm (EN): 1.4539

JIS Standard: JIS G 4305 SUS 329J3L

Chemical Composition:

Chromium (Cr): 25.0-26.5%

Nickel (Ni): 6.0-7.5%

Molybdenum (Mo): 3.0-4.0%

Nitrogen (N): 0.22-0.30%

Manganese (Mn): ≤1.5%

Silicon (Si): ≤0.50%

Phosphorus (P): ≤0.03%

Sulfur (S): ≤0.02%

Carbon (C): ≤0.03%

Physical Properties:

Density: Approximately 8.0 g/cm³

Melting Point: Around 1390-1420°C

Coefficient of Thermal Expansion: 12.8 x 10⁻⁶ /°C (at room temperature)

Mechanical Properties:

Tensile Strength: 800-1000 MPa

Yield Strength: 550-650 MPa

Elongation: ≥20%

Hardness: Approximately HB 260-310 (Rockwell B scale)

Application Areas:

Chemical and Process Industry: Used in the manufacturing of equipment and components that come into contact with highly corrosive chemicals, such as pickled food processors, paper industry bleaching equipment, and chemical reactor vessels.

Marine Applications: Suitable for applications in maritime environments, including offshore platforms, propellers, and heat exchangers in seawater.

Oil and Gas Industry: Resistant to the corrosive challenges present in oil and gas refineries, pipelines, wells, and subsea production systems.

Desalination Plants: Employed in heat exchangers and piping systems due to its high resistance to pitting and crevice corrosion.

Pulp and Paper Industry: Utilized in equipment and components that handle corrosive chemicals in the pulp and paper manufacturing process.

Food Processing: Used in equipment that processes acidic or chloride-containing foods where both high strength and corrosion resistance are required.

S32654 stainless steel is valued for its excellent combination of strength, corrosion resistance, and fabricability, making it suitable for a variety of demanding applications. The specific chemical composition, physical, and mechanical properties may vary as per different standards and manufacturers, so the information provided is intended for general guidance.

Common Surfaces

Stainless Steel Standards Comparison Table