Stainless Steel 904L Pipe
High-Alloy Super Austenitic Stainless Steel Pipes
SS 904L Pipe is a non-stabilized super austenitic stainless steel with low carbon content. The addition of copper to this high-alloy grade gives it significantly improved resistance to strong reducing acids, particularly sulfuric acid. It is also highly resistant to chloride attack—both pitting and crevice corrosion—as well as stress corrosion cracking. It is designed for severe corrosion conditions and is non-magnetic in all conditions.
Technical Specifications
| Feature | Details |
|---|---|
| Standards | ASTM A312, A213, A269, SB 677 |
| Grade | TP 904L / UNS N08904 |
| Size Range | 1/8" NB to 24" NB (Seamless & Welded) |
| Schedules | SCH 5S, 10S, 40S, 80S, 160, XXS |
| Manufacturing | Seamless / ERW / Welded / Cold Drawn |
| Testing | Flare Test, Flattening Test, PMI, Radiography |
Mechanical Properties
| Property | Value (Min) |
|---|---|
| Yield Strength (0.2% Offset) | 220 MPa (31,000 psi) |
| Tensile Strength | 490 MPa (71,000 psi) |
| Elongation | 35% |
| Hardness (Rockwell B) | Max 90 HRB |
Chemical Composition (%)
| Element | SS 904L Percentage |
|---|---|
| Carbon (C) | 0.020 max |
| Nickel (Ni) | 23.0 - 28.0 |
| Chromium (Cr) | 19.0 - 23.0 |
| Molybdenum (Mo) | 4.0 - 5.0 |
| Copper (Cu) | 1.0 - 2.0 |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.035 max |
| Nitrogen (N) | 0.10 max |
Features and Benefits of SS 904L Pipe
- Exceptional resistance to sulfuric, phosphoric, and acetic acids
- High resistance to pitting in high chloride solutions
- Low carbon content allows for welding without risk of sensitization
- Non-magnetic properties even after welding or cold working
- Excellent toughness and impact strength at both room and sub-zero temperatures
- Superior performance in seawater and offshore brackish environments
- Highly resistant to stress corrosion cracking (SCC)
- Compliant with stringent international quality standards
Applications & Uses
Acid Processing
Used in sulfuric acid plants and chemical processing involving phosphoric and acetic acids.
Marine Systems
Applied in seawater cooling equipment, offshore oil platforms, and desalination plants.
Paper & Pulp
Essential for bleaching equipment and digesters where corrosive chlorides are present.