Overview
904L stainless steel (UNS N08904 / EN 1.4539) is a high-alloy austenitic stainless steel designed for applications requiring exceptional corrosion resistance in highly aggressive environments.
With high levels of chromium, nickel, molybdenum, and copper, 904L provides excellent resistance to sulfuric acid, phosphoric acid, chloride environments, and other corrosive media. Compared with conventional stainless steels such as 304 and 316L, 904L offers superior performance in harsh chemical conditions.
Due to its outstanding corrosion resistance and durability, 904L stainless steel is widely used in chemical processing, pharmaceutical equipment, marine engineering, pollution control, heat exchangers, and high-purity industrial applications.
At Yunming Metal, we supply a complete range of 904L stainless steel products, including seamless tubes, welded tubes, pipes, plates, bars, flanges, and fittings. Our products are manufactured according to international standards and customized to meet different project requirements.
Why Choose 904L Stainless Steel?
904L stainless steel is selected for applications where standard stainless steels cannot provide sufficient corrosion resistance.
Excellent Acid Corrosion Resistance
The addition of copper significantly improves resistance to reducing acids, especially:
- Sulfuric acid
- Phosphoric acid
- Organic acids
making 904L suitable for highly corrosive chemical environments.
Superior Pitting and Crevice Corrosion Resistance
The high chromium and molybdenum content provides excellent resistance against:
- Pitting corrosion
- Crevice corrosion
- Chloride attack
Outstanding Chloride Resistance
904L performs well in chloride-containing environments, including marine and chemical processing applications.
Excellent Weldability
Despite its high alloy content, 904L can be welded using common industrial welding methods while maintaining corrosion resistance.
Long Service Life
904L reduces maintenance requirements and improves equipment reliability in demanding applications.
Typical Applications of 904L Stainless Steel
Chemical Processing Industry
904L is widely used in chemical plants where equipment is exposed to aggressive chemicals.
Typical applications include:
- Chemical reactors
- Storage tanks
- Process piping
- Acid handling systems
- Heat exchangers
Related Industry:
Chemical Industry
Pharmaceutical Industry
Due to its excellent corrosion resistance and hygienic properties, 904L is used in specialized pharmaceutical equipment.
Applications include:
- High purity process systems
- Reaction vessels
- Storage equipment
- Pharmaceutical piping
Related Industry:
Pharmaceutical Industry
Marine Engineering
904L offers excellent resistance to seawater corrosion and is used in demanding marine environments.
Applications include:
- Seawater systems
- Marine piping
- Offshore equipment
- Heat exchangers
Related Industry:
Marine Applications
Pollution Control & Environmental Equipment
904L is commonly used in pollution control systems because of its resistance to acidic gases and corrosive media.
Applications include:
- Flue gas treatment systems
- Scrubbers
- Waste treatment equipment
Related Industry:
Water Treatment
Heat Exchanger Systems
904L tubes are suitable for heat exchangers handling corrosive fluids where higher corrosion resistance than 316L is required.
Applications include:
- Chemical heat exchangers
- Condensers
- Cooling systems
Related Industry:
Heat Exchanger
Oil & Gas Industry
904L can be used in specialized oil and gas applications requiring high corrosion resistance.
Applications include:
- Process equipment
- Acid service systems
- Instrumentation components
Related Industry:
Oil & Gas
Our 904L Stainless Steel Products
Yunming Metal provides a complete range of 904L stainless steel products:
- 904L Stainless Steel Seamless Tubes
- 904L Stainless Steel Welded Tubes
- Stainless Steel Pipes
- Stainless Steel Plates
- Stainless Steel Bars
- Stainless Steel Flanges
- Stainless Steel Fittings
Customized sizes, wall thicknesses, lengths, and surface finishes are available according to customer specifications.
Technical Specifications
| Item | Specification |
|---|---|
| Material Grade | 904L Stainless Steel |
| UNS | N08904 |
| EN | 1.4539 |
| Standard | ASTM A312, ASTM A269, ASTM A213 |
| Plate Standard | ASTM A240 |
| Flange Standard | ASTM A182 F904L |
| Surface | Pickled, Polished, Bright Annealed |
| MTC | EN 10204 3.1 Available |
904L Stainless Steel vs 316L Stainless Steel
| Property | 316L Stainless Steel | 904L Stainless Steel |
|---|---|---|
| Corrosion Resistance | Excellent | Superior |
| Acid Resistance | Good | Excellent |
| Nickel Content | Lower | Higher |
| Copper Addition | No | Yes |
| Chloride Resistance | Good | Excellent |
| Typical Applications | Food, Medical, Chemical | High-corrosion chemical and specialty applications |
Why Choose Yunming Metal?
Yunming Metal supplies reliable 904L stainless steel solutions for demanding industrial applications.
Our advantages include:
- Professional stainless steel manufacturing experience
- Complete product range
- Strict quality inspection
- EN 10204 3.1 material certificates available
- Customized production capability
- Export experience worldwide
- Technical support for material selection
Frequently Asked Questions
What is 904L stainless steel used for?
904L is mainly used in chemical processing, pharmaceutical equipment, marine systems, heat exchangers, pollution control equipment, and high-corrosion industrial applications.
Is 904L better than 316L?
Yes. 904L provides significantly better resistance to aggressive acids and chloride environments compared with 316L, making it suitable for more demanding applications.
Can 904L stainless steel be welded?
Yes. 904L has good weldability and can be processed using standard welding methods with proper procedures.
Is 904L stainless steel suitable for seawater?
Yes. 904L provides excellent resistance in seawater environments, although duplex and super duplex grades may be preferred for some high-strength marine applications.
Can Yunming Metal supply customized 904L products?
Yes. We provide customized 904L tubes, pipes, plates, bars, flanges, and fittings according to customer specifications.
Conclusion
904L stainless steel is a premium corrosion-resistant alloy designed for the most demanding industrial environments. Its excellent resistance to acids, chlorides, and aggressive chemicals makes it an ideal choice for chemical processing, pharmaceutical, marine, and specialty industrial applications.
Yunming Metal provides high-quality 904L stainless steel tubes, pipes, plates, bars, flanges, and fittings manufactured according to international standards. Contact us for professional material solutions and customized stainless steel products.