ASTM A269 TP904L Stainless Steel Tube for Chloride and Acid Service Applications
When standard 316L stainless steel is no longer sufficient, many engineering companies specify ASTM A269 TP904L stainless steel tube.
TP904L is a high-alloy austenitic stainless steel containing elevated levels of nickel, molybdenum, and copper. The alloy was developed for aggressive environments where chloride-induced corrosion, pitting, and stress corrosion cracking can become major concerns.
For heat exchangers, instrumentation tubing, and chemical processing systems operating in seawater or acidic media, TP904L is often selected as a cost-effective alternative to nickel alloys.
Product Specifications
| Item |
|
| Standard | ASTM A269 |
| Grade | TP904L (UNS N08904) |
| Manufacturing Process | Seamless / Welded |
| Outside Diameter | 6 mm – 114.3 mm |
| Wall Thickness | 0.5 mm – 8 mm |
| Length | Up to 12 m |
| Surface Condition | Annealed, Pickled, Bright Annealed |
| Testing |
|
| Payment Terms | T/T, L/C |
| Property | Value |
| Chromium (Cr) | 19.0 – 23.0% |
| Nickel (Ni) |
|
| Molybdenum (Mo) | 4.0 – 5.0% |
| Copper (Cu) | 1.0 – 2.0% |
| Carbon (C) | ≤ 0.02% |
| Tensile Strength |
|
| Yield Strength | ≥ 220 MPa |
| Elongation |
|
Why TP904L Is Often Chosen for Critical Service
Excellent Resistance to Chloride Pitting
The combination of high molybdenum and nickel content gives TP904L significantly better resistance to chloride attack than conventional 304L and 316L grades.
Improved Performance in Acidic Media
Copper additions help enhance resistance in sulfuric acid and phosphoric acid environments, making TP904L common in fertilizer and chemical processing plants.
Lower Risk of Stress Corrosion Cracking
In warm chloride-containing systems, TP904L generally provides better resistance to stress corrosion cracking than standard austenitic stainless steels.
Suitable for High-Purity Tubing Systems
ASTM A269 tubing is widely used where dimensional accuracy, surface cleanliness, and reliable corrosion performance are required.
TP904L: The Go-To Alloy for High-Stakes Industrial Service
TP904L tubing stands out for its outstanding acid and chloride resistance, making it the top pick for industrial projects that cannot afford downtime or pipe leakage.
We supply this alloy to clients across many heavy-duty sectors: seawater desalination plants, offshore energy platforms, fertilizer factories, sulfuric & phosphoric acid processing workshops, chemical transfer pipelines, heat exchanger equipment and precision instrument tubing.
Our regular buyers stick to a consistent set of quality requirements for every order: BA bright annealed surface, full PMI material check, third-party witnessed inspection, controlled low sulfur content, custom cut lengths, small precision bore tubing, plus complete EN 10204 3.2 certification for full batch traceability.
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