Product Overview ASTM A403 WP904L Stub End
ASTM A403 WP904L Stub End are high-alloy austenitic stainless steel butt-weld fittings manufactured from 904L (UNS N08904 / EN 1.4539) material. Stub ends are used with lap joint flanges to create a detachable and easily maintainable piping connection, especially in highly corrosive environments.
WP904L offers exceptional resistance to pitting, crevice corrosion, and chloride stress corrosion cracking due to its high chromium, nickel, molybdenum, and copper content. These stub ends are ideal for acid processing systems, offshore platforms, oil & gas installations, and desalination plants.
Manufactured in compliance with ASTM A403 and dimensional standards such as ASME B16.9 / MSS SP-43, WP904L stub ends ensure dimensional accuracy, strength, and long service life.
Key Features
- Excellent resistance to sulfuric & phosphoric acids
- Superior resistance to chloride environments
- Ideal for use with lap joint flanges
- High strength and durability
- Low carbon content (≤0.02%) reduces carbide precipitation
- Suitable for high-pressure and high-temperature services
Available Types
- Long Pattern Stub End
- Short Pattern Stub End
- Custom Length Stub End
Available Sizes
| Nominal Pipe Size (NPS) | Schedule |
|---|---|
| ½” to 24” | SCH 5S to SCH XXS |
| Larger Sizes | 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
- Power Generation Plants
- Fertilizer & Pharmaceutical Industry
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