What Is 904L Stainless Steel Sheet?

904L stainless steel sheet is a high-performance alloy that belongs to the family of super austenitic stainless steels. Its unique chemical composition and outstanding properties make it an ideal choice for use in highly corrosive and demanding environments. Developed with advanced metallurgical techniques, 904L offers unparalleled resistance to various types of corrosion and ensures excellent durability.

Chemical Composition of 904L Stainless Steel

The exceptional performance of 904L stainless steel sheet stems from its carefully balanced chemical composition. The alloy includes:

• Chromium (Cr): 14.0–18.0%

• Nickel (Ni): 24.0–26.0%

• Molybdenum (Mo): 4.5%

• Copper (Cu): Added to enhance resistance to reducing acids

This low-carbon, high-nickel, and molybdenum alloy is engineered for superior corrosion resistance, especially in harsh chemical environments.

Key Features of 904L Stainless Steel Sheet

1. Outstanding Corrosion Resistance

904L stainless steel sheet is renowned for its excellent resistance to corrosion in a variety of conditions:

• Non-Oxidizing Acids: Highly resistant to sulfuric, acetic, formic, and phosphoric acids.

• Chloride Media: Superior resistance to pitting, crevice corrosion, and stress corrosion cracking, even in environments containing chloride ions.

• Mixed Acids: Exceptional performance in formic and acetic acid mixtures.

2. Superior Mechanical Properties

• Density: 8.0 g/cm³

• Tensile Strength: ≥520 MPa

• Elongation: ≥35%

These properties ensure the alloy’s ability to withstand high pressures and mechanical stress while maintaining its integrity over time.

3. Excellent Weldability and Fabrication

The low carbon content of 904L prevents carbide precipitation during welding, eliminating the risk of intergranular corrosion. Its austenitic microstructure also allows for easy fabrication and machining.

Applications of 904L Stainless Steel Sheet

The high corrosion resistance and mechanical strength of 904L make it a preferred material in industries such as:

• Chemical Processing: Storage and transportation of corrosive chemicals.

• Marine Engineering: Components exposed to saline and seawater conditions.

• Pharmaceutical Equipment: Ensures purity in drug production.

• Pressure Vessels: High resistance to stress and corrosion in extreme environments.

Why Choose 904L Stainless Steel Sheet?

High Chromium and Nickel Content

The combination of high chromium and nickel levels enhances its corrosion resistance, even in the presence of chlorides, sulfuric acid, and reducing agents.

Unique Copper Additions

Copper further boosts its ability to resist acids, providing superior protection against corrosion in reducing and mixed acid environments.

Versatility in Extreme Conditions

904L stainless steel performs exceptionally well across a range of temperatures and concentrations, making it one of the most versatile materials in its class.

Standards and Designations

904L stainless steel conforms to various international standards:

• UNS N08904

• DIN 1.4539

• ASTM A240

• SUS890L

These certifications ensure its global acceptance and reliability for critical applications.

Conclusion

904L stainless steel sheet is an advanced, high-performance alloy tailored for the most challenging environments. Its superior corrosion resistance, excellent mechanical properties, and ease of fabrication make it a cornerstone material for industries requiring durability and reliability.

Choose 904L stainless steel sheet to ensure unmatched quality and performance for your demanding applications.