ASTM A269 TP904L Stainless Steel Tubes (UNS N08904)
ASTM A269 TP904L (UNS N08904) Stainless Steel Tubes are high-alloy, low-carbon austenitic stainless steel tubes known for their exceptional corrosion resistance, especially in aggressive environments containing sulfuric acid, phosphoric acid, seawater, and chloride-rich media. TP904L contains high levels of nickel (approx. 25%) and molybdenum (approx. 4.5%), making it a premium-grade alloy with excellent resistance to pitting, crevice corrosion, and stress corrosion cracking.
Due to its superior corrosion-resistance profile, 904L stainless steel is widely used in chemical processing plants, desalination units, marine environments, and high-pressure piping systems.
Key Features
- Excellent Resistance to Strong Acids including sulfuric & phosphoric acids.
- High Nickel & Molybdenum Content for superior pitting and crevice corrosion resistance.
- Low Carbon Content eliminates carbide precipitation during welding.
- Excellent Stress Corrosion Cracking Resistance in chloride environments.
- High Mechanical Strength & Durability in extreme industrial conditions.
- Non-Magnetic in Annealed Condition with good weldability and formability.
- Ideal for Highly Corrosive & Seawater Applications.
Specification
| Property | Details |
|---|---|
| Standard | ASTM A269 – Seamless & Welded Austenitic Stainless Steel Tubes |
| Grade | TP904L |
| UNS Number | N08904 |
| WNR Number | 1.4539 |
| Form | Seamless, Welded, Bright Annealed Tubes |
| Outer Diameter (OD) | 1/8” to 12” |
| Wall Thickness | 0.5 mm to 12 mm |
| Length | SRL, DRL, Cut-to-Length |
| Surface Finish | Annealed, BA, Polished (180–400 grit) |
| Manufacturing Process | Cold Drawn / Cold Rolled / Welded |
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | N08904 |
| WNR | 1.4539 |
| EN | X1NiCrMoCu25-20-5 |
| BS | 904S13 |
| JIS | SUS 904L |
Available Sizes
- Outer Diameter (OD): 3.2 mm – 114.3 mm
- Wall Thickness: 0.5 mm – 12 mm
- Length: Up to 12 meters
- Custom sizes available on order
ASTM A269 TP904L Chemical Composition
| Element | % Composition |
|---|---|
| Carbon (C) | ≤ 0.02 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | 19.0 – 23.0 |
| Nickel (Ni) | 23.0 – 28.0 |
| Molybdenum (Mo) | 4.0 – 5.0 |
| Copper (Cu) | 1.0 – 2.0 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
ASTM A269 TP904L Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 490 MPa |
| Yield Strength (0.2% Proof) | ≥ 220 MPa |
| Elongation | ≥ 35% |
| Hardness (Rockwell B) | ≤ 90 HRB |
| Density | 8.0 g/cm³ |
ASTM A269 TP904L Physical Properties
| Property | Value |
|---|---|
| Melting Point | 1350 – 1380°C |
| Thermal Conductivity | 12.5 W/m-K (at 100°C) |
| Electrical Resistivity | 0.94 µΩ-m |
| Thermal Expansion | 16.5 × 10⁻⁶ /°C |
| Modulus of Elasticity | 190 GPa |
Types of ASTM A269 TP904L Stainless Steel Tubes
- Seamless Tubes
- Welded Tubes
- Bright Annealed Tubes
- Electropolished Tubes
- Heat Exchanger Tubes
- Condenser Tubes
- U-Bend Tubes
- Instrumentation Tubes
- Capillary Tubes
- Hydraulic Tubes
Applications
- Sulfuric Acid Plants
- Phosphoric Acid Production Equipment
- Chemical Processing & Reactors
- Marine & Offshore Engineering
- Desalination Plants
- Heat Exchangers & Condensers
- Paper & Pulp Industry
- Pharmaceutical & Food Processing
- Oil & Gas Refining
- High-Chloride Environments & Brine Systems
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