904L chemical-resistant pipe features a 25Cr-20Ni-4.5Mo super-austenitic structure. In 20% H₂SO₄ (80℃), its corrosion rate ≤0.1 mm/year.
| Element | Content (%) | Corrosion Resistance Role |
|---|---|---|
| Cr | 23.0–28.0 | Forms high-chromium passive film; repair rate 0.3 nm/h in concentrated acids, prevents penetration corrosion. |
| Ni | 19.0–23.0 | Improves resistance to non-oxidizing acids (e.g., H₂SO₄), reduces susceptibility to stress corrosion. |
| Mo | 4.0–5.0 | Enhances pitting resistance, PREN ≥45, suitable for Cl⁻ containing chemical media. |
Physical: Density 8.0 g/cm³, Melting Point 1350–1400℃, Thermal Expansion 14.5×10⁻⁶/℃
Chemical: In 10% HNO₃ (60℃), corrosion current density ≤0.5 μA/cm²; intergranular corrosion resistant (ASTM A262 E, no cracks)
Outer Diameter: 25–273 mm
Wall Thickness: 3–25 mm
Length: 6–12 m (±8 mm)
Surface Treatment: Solution-annealed & pickled (BA); inner wall electropolished (Ra ≤1.0 μm); optional PTFE lining
Stainless Steel Tubes Packed in Truck
Wooden Crate Packaging in Factory
Neo-Mac Machine with Stainless Steel Tubes
Factory Tube Packaging Process
Industrial Manufacturing Equipment
Stainless Steel Composition Analyzer
Specification: Φ89×6 mm
Performance: 98% H₂SO₄ corrosion resistance for 8 years, no perforation
Case: BASF Nanjing Chemical Park Pickling Pipeline
Specification: Φ159×8 mm
Performance: Resistant to 85% H₃PO₄ (100℃)
Case: Yuntianhua DAP Production Line Pipeline
Walmay will help match the right stainless product form and specification for your application, confirm quantities and packing needs, and provide requested documents based on order requirements.
