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UNS N08904 - EN 1.4539

UNS N08904 - EN 1.4539

UNS N08904 - EN 1.4539 offers optimal corrosion resistance and superior mechanical properties. This stainless steel alloy is commonly used in applications requiring higher levels of corrosion and heat resistance. It also provides excellent durability and strength, making it an ideal choice for many industrial needs.

Equivalent grades

• ASTM 904L
• DIN 1.4539
• UNS N08904
• X1NiCrMoCu25-20-5

Chemical Composition Reference


Physical Property Reference

• Density: 8.0 kg/dm³

• Tensile Strength: 600 MPa

• Yield Strength: 220 MPa

• Specific Heat Capacity: 0.55kg/(kg.k)

• Thermal Conductivity: 12.9-18w/(m.k)

• Coefficient of Linear Expansion: 16.1(10-6/k)

Stock & Dimensions

Our warehouse has a large number of stock to provide you with a variety of products in different sizes, and can also customize the size according to your needs.
• Bar: 0.5~600mm Diameter
• Coil: 0.5~150mm Thick
• Plate: 0.5~200mm Thick
• Pipe: 6~630mm External Diameter; 0.5~40mm Wall Tick
• Available in specific sizes

Product Forms

We provide you with a variety of product forms, including but not limited to:
• Bar/Rod
• Pipe/Tube
• Coil/Strip
• Plate/Sheet/Circle
• Wire
• Fitting (Flange, Elbow, Tee...)
• Customize

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UNS N08904 - EN 1.4539

Essential details
N08904 is a high-alloy austenitic stainless steel with low carbon content. It has good corrosion resistance in dilute sulfuric acid and is specially designed for harsh corrosive environment. It has high chromium content and sufficient nickel content.

The addition of copper makes it have strong acid resistance, especially high resistance to chloride clearance corrosion and stress corrosion cracking, and is not prone to corrosion spots and cracks. Its pitting resistance is slightly better than other steel grades. It has good machinability and weldability, and can be used for pressure vessels.


- Petroleum and petrochemical equipment, such as reactors in petrochemical equipment,

- Sulfuric acid storage and transportation equipment, such as heat exchanger

- The flue gas desulfurization device of the power plant is mainly used in the tower body, flue, door baffle, internals, spray system, etc. of the absorption tower, and the scrubber and fan in the organic acid treatment system

- Seawater treatment plant

- Seawater heat exchanger

- Paper industry equipment

- Sulfuric acid, equipment, acid-making, pharmaceutical industry

- Other chemical equipment, pressure vessels, food equipment, pharmaceutical plants: centrifuges, reactors, etc., plant foods: soy sauce cans, cooking wine, salt cans, equipment and dressings

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