ASTM A403 WP904L Coupling is a high-alloy austenitic stainless steel pipe fitting manufactured from 904L (UNS N08904 / EN 1.4539) material. It is used to connect two pipes of the same diameter in highly corrosive environments where superior resistance to acids, chlorides, and seawater is required.
WP904L contains high levels of chromium, nickel, molybdenum, and copper, providing exceptional resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. These couplings are widely used in chemical processing plants, offshore platforms, oil & gas installations, and sulfuric acid handling systems.
Manufactured in compliance with ASTM standards and supplied with complete traceability, WP904L couplings ensure strength, pressure integrity, and long service life in aggressive service conditions.
Key Features
- Excellent resistance to sulfuric & phosphoric acids
- Superior performance in chloride environments
- High strength and durability
- Excellent weldability and machinability
- Low carbon content (≤0.02%) minimizes carbide precipitation
- Suitable for high-pressure applications
Available Types
- Full Coupling
- Half Coupling
- Threaded Coupling
- Socket Weld Coupling
-
Reducing Coupling
Available Sizes
| Nominal Size | Schedule |
|---|---|
| ½” to 12” | SCH 5S to SCH XXS |
| Larger Sizes | On Request |
ASTM A403 WP904L Chemical Composition (%)
| Element | Content |
|---|---|
| Chromium (Cr) | 19.0 – 23.0 |
| Nickel (Ni) | 23.0 – 28.0 |
| Molybdenum (Mo) | 4.0 – 5.0 |
| Copper (Cu) | 1.0 – 2.0 |
| Carbon (C) | ≤ 0.02 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
ASTM A403 WP904L Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 490 MPa |
| Yield Strength | ≥ 220 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 90 HRB |
Applications
- Chemical & Petrochemical Plants
- Acid Processing Units
- Offshore & Marine Systems
- Oil & Gas Industry
- Desalination Projects
- Power Generation Plants
- Pharmaceutical Industry
Reviews
There are no reviews yet.