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ASTM 441 - EN 1.4509

ASTM 441 - EN 1.4509

ASTM 441 - EN 1.4509 is a 18% chromium ferritic stainless steel, lacking nickel, specifically developed for exhaust systems; exhibiting excellent corrosion resistance and strong temperature resistance. Outstanding corrosion resistance, formability and weldability make ASTM 441 - EN 1.4509 a suitable substitute. Plus, this steel can be available with many surface finishes.

Equivalent grades

• DIN 1.4509
• UNS S43940
• X2CrTiNb18
• 022Cr18Mo2

Chemical Composition Reference

17.5 – 18.5Cr, 0.1

Physical Property Reference

• Density: 7.7 g/cm³

• Electrical resistance: 0.60 μΩ·m

• Thermal conductivity: 25 W/(m·K)

• Specific heat: 460 J/(kg·K)

• Young's modulus: 220 GPa

• 0.2% Yield stress: 205 MPa, min

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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ASTM 441 - EN 1.4509

Essential details
Grade 1.4509 | X2CrTiNb18 is well suited for cold forming, e.g. bending, flanging and deep drawing, and is easily weldable by all methods except gas welding. It is used for silencer and exhaust gas detoxification systems in motor vehicles. In addition, the AISI 441 has good corrosion resistance to the stresses occurring in the exhaust system.


- Heat exchangers

- Acid and nitrogen oxide pipelines

- Acid storage tanks

- Acid transport tanks

- Dairy, fruit and vegetable and brewery industries

- Textile industry

- Household appliances

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