904L Stainless Steel Pipe for Corrosive Applications
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What Is 904L Stainless Steel Pipe?
904L stainless steel pipe, also known as UNS N08904 or EN 1.4539, is a high-alloy austenitic stainless steel designed to offer exceptional corrosion resistance in aggressive environments. With high nickel (24–26%) and molybdenum (4–5%) content, it performs better than standard grades like 316L in harsh chemical, acidic, and marine conditions.
Chemical Composition of 904L (UNS N08904)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.02 |
| Chromium (Cr) | 19.0–23.0 |
| Nickel (Ni) | 23.0–28.0 |
| Molybdenum (Mo) | 4.0–5.0 |
| Copper (Cu) | 1.0–2.0 |
| Iron (Fe) | Balance |
Why Choose 904L Pipe for Corrosive Applications?
| Corrosive Environment | 904L Performance |
|---|---|
| Sulfuric acid (H₂SO₄) | Excellent resistance, especially up to 70°C |
| Phosphoric acid (H₃PO₄) | Good corrosion resistance |
| Chloride-rich environments (NaCl) | High resistance to pitting/crevice corrosion |
| Seawater & brine | Suitable for marine systems |
| Acetic & nitric acids | Excellent general corrosion resistance |
Applications of 904L Stainless Steel Pipe
904L welded and seamless pipes are widely used in:
🏭 Chemical and petrochemical industries (acid storage, heat exchangers)
🚢 Marine engineering (ballast water systems, desalination plants)
🧪 Pharmaceutical & biotech (clean piping systems, process lines)
🧼 Pulp and paper (bleach towers, acid piping)
🧯 Flue gas desulfurization (FGD) systems
⚗️ Fertilizer production (H₂SO₄ transfer lines)
Standards for 904L Stainless Steel Pipe
| Standard | Designation | Description |
|---|---|---|
| ASTM A312 / B677 | UNS N08904 | Seamless or welded austenitic stainless pipe |
| EN 10216-5 / EN 10217-7 | 1.4539 | Seamless/welded pipe for pressure service |
| ISO 2037 | 904L | Tubes for hygienic applications |
| JIS G3459 | SUS890L / SUS904L | Japanese standard for corrosion-resistant pipe |
ASTM B677 UNS N08904 pipe Supplier - GNEE
We specialize in welded and seamless 904L stainless steel pipes for high-corrosion environments. All products come with mill test certificates, NDT reports, and customized finishing options.
Outer Diameter (OD): 1/4" to 24" (6 mm – 610 mm)
Wall Thickness: SCH 5S to SCH 80S or customized
Form: Seamless, welded (TIG/ERW/EFW), U-bent
Surface Finish: Pickled, polished (180–320 grit), electropolished
Certification: EN 10204 3.1 / 3.2, NACE MR0175, PED
End Types: Plain end, beveled, threaded
Packaging: Plastic caps + waterproof wrapping + wooden cases/pallets
Export Markets: Europe, Middle East, Southeast Asia, North America
👉 Request a free quote or datasheet today!
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