Product Overview ASTM A403 WP904L Cap
ASTM A403 WP904L Cap is a high-alloy austenitic stainless steel butt-weld pipe fitting manufactured from 904L (UNS N08904 / EN 1.4539) material. These caps are used to close the end of piping systems in highly corrosive environments where superior resistance to acids and chlorides is essential.
WP904L offers excellent resistance to pitting, crevice corrosion, and chloride stress corrosion cracking due to its high chromium, nickel, molybdenum, and copper content. These pipe caps are ideal for critical applications in chemical processing, offshore, oil & gas, desalination, and sulfuric acid plants.
Manufactured as per ASTM A403 and dimensional standard ASME B16.9, WP904L caps ensure pressure integrity, durability, and long service life.
Key Features
- Excellent resistance to sulfuric & phosphoric acids
- Superior resistance to chloride environments
- High strength and durability
- Excellent weldability
- Low carbon content (≤0.02%) minimizes carbide precipitation
- Suitable for high-pressure and high-temperature services
Available Sizes
| Nominal Pipe Size (NPS) | Schedule |
|---|---|
| ½” to 24” | SCH 5S to SCH XXS |
| Up to 48” | On Request |
Wall Thickness Options:
SCH 5S, 10S, 20, 40S, 40, 60, 80S, 80, 120, 160, XXS
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
- Sulfuric Acid Processing Units
- Offshore & Marine Systems
- Oil & Gas Refineries
- Desalination Projects
- Heat Exchangers
- Power Generation Plants
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