Ss 904l Pipes – Built For Performance In Aggressive Industrial Environments

By Author: Vikas Jain
Total Articles: 10
Comment this article

Stainless Steel 904L Pipes are high-alloy austenitic stainless steel products that offer outstanding corrosion resistance, especially in environments rich in chlorides, sulfuric acid, and other aggressive chemicals. Known for their low carbon content and high concentrations of chromium, nickel, molybdenum, and copper, SS 904L pipes are widely used in industries such as chemical processing, pharmaceuticals, seawater handling, and oil & gas.
Developed for enhanced corrosion resistance over standard austenitic stainless steels like 304 and 316, 904L is the preferred choice for industries that demand superior performance and long service life in extremely harsh conditions.

What is Stainless Steel 904L?
Stainless Steel 904L (UNS N08904) is a fully austenitic low-carbon stainless steel alloy with exceptional resistance to corrosion and stress-related cracking. It contains significant amounts of chromium, nickel, and molybdenum, along with copper, which enhances its resistance to sulfuric and phosphoric acids. Originally developed for use in aggressive environments involving sulfuric acid, it has become a versatile ...
... alloy for many chemical-related applications.

Chemical Composition of SS 904L Pipes
Element Content (%)
Chromium (Cr) 19.0 – 23.0
Nickel (Ni) 23.0 – 28.0
Molybdenum (Mo) 4.0 – 5.0
Copper (Cu) 1.0 – 2.0
Carbon (C) ≤ 0.02
Manganese (Mn) ≤ 2.00
Silicon (Si) ≤ 1.00
Phosphorus (P) ≤ 0.045
Sulfur (S) ≤ 0.035
Iron (Fe) Balance
This unique composition delivers unmatched performance in highly corrosive environments and contributes to the alloy’s non-magnetic nature.

Key Features and Benefits
1. Exceptional Corrosion Resistance
SS 904L pipes provide excellent resistance to reducing acids, chloride-induced corrosion, and pitting. They perform well in both oxidizing and reducing environments, making them suitable for harsh chemical exposure.
2. High Resistance to Sulfuric Acid
One of the most significant advantages of SS 904L is its outstanding resistance to sulfuric acid across a wide range of concentrations and temperatures.
3. Excellent Weldability and Formability
Thanks to its low carbon content, SS 904L can be welded using all standard welding methods without the risk of carbide precipitation. It also has good formability and machinability.
4. Resistance to Stress Corrosion Cracking
SS 904L performs well in chloride-containing environments, reducing the risk of stress corrosion cracking and crevice corrosion.
5. Long Service Life
Its high resistance to corrosion and wear results in reduced maintenance needs and an extended operational life, lowering long-term costs.

Applications of Stainless Steel 904L Pipes
SS 904L pipes are used in a wide range of industries where corrosion and temperature resistance are essential:
• Chemical processing equipment
• Heat exchangers and condensers
• Pharmaceutical and food processing plants
• Seawater cooling systems
• Pulp and paper industry
• Oil and gas refining
• Desalination plants
• Fertilizer production equipment
These pipes are particularly valuable in equipment handling acidic solutions, seawater, and corrosive chemical media.

Available Forms and Specifications
Stainless Steel 904L pipes are available in a variety of types, including seamless, welded, ERW, and fabricated forms.
Standards and Specifications:
• ASTM B677 / ASME SB677
• ASTM B673 / ASME SB673
• ASTM B674 / ASME SB674
• UNS N08904
Size Range: 1/8” NB to 24” NB
Thickness: Sch 5S to Sch XXS
Length: Custom cut lengths, single random, double random

Why Choose Stainless Steel 904L Pipes?
Choosing SS 904L pipes ensures:
• Superior resistance to corrosion, pitting, and cracking
• Extended life span even in highly acidic or chloride-rich conditions
• Low maintenance and long-term cost efficiency
• Conformance to international quality standards
SS 904L is a premium-grade material that offers peace of mind in the most demanding service environments.

Conclusion
Stainless Steel 904L Pipes are a top-tier solution for industries that require outstanding corrosion resistance and durability in aggressive media. Whether in chemical plants, marine systems, or oil refineries, SS 904L delivers unmatched reliability, reduced maintenance, and long-term performance. Its proven capabilities make it a preferred choice for mission-critical applications in corrosive environments.