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ASTM 444 - EN 1.4521

ASTM 444 - EN 1.4521

ASTM 444 - EN 1.4521 is an 18% chromium stainless steel which is nickel-free, has a stabilized molybdenum alloy, is capable of use in corrosive settings, and offers good welding and high-temperature properties. Its ferritic microstructure endows it with resistance to chloride-induced stress corrosion cracking.

Equivalent grades

• DIN 1.4521
• UNS S44401
• X2CrMoTi18-2

Chemical Composition Reference

17.0 – 20.0Cr, 1.8

Physical Property Reference

• Density: 7.7 g/cm³

• Electrical resistance: 0.60 μΩ·m

• Thermal conductivity: 23 W/(m·K)

• Specific heat: 460 J/(kg·K)

• Young's modulus: 220 GPa

• 0.2% Yield stress: 275 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 444 - EN 1.4521

Essential details
AISI 444 is a low carbon, dual stabilised, molybdenum containing ferritic stainless steel with good ductility, toughness and resistance to sensitisation, even in the welds. With 18% chromium and 2% molybdenum, the steel has good pitting resistance and crevice corrosion resistance, similar to 316 and good general corrosion resistance and oxidation resistance, similar to 316 in most environments. Being a ferritic stainless steel, EN 1.4521 is not susceptible to Stress Corrosion Cracking. Annealed UNS S44401 is ductile and can be formed using a wide range of roll forming or mild stretch bending operations as well as the more common drawing and bending operations. It does not harden excessively during cold working.


- 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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