What Is ASTM A403 WP304L Pipe Fitting?
Nov 11, 2025
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What Is ASTM A403 WP304L Pipe Fitting?
ASTM A403 WP304L pipe fittings are austenitic stainless steel fittings made from low-carbon 304L material, designed for use in pressure piping systems, chemical process lines, and food-grade fluid transfer applications. The "L" in 304L stands for Low Carbon (≤0.03%), which significantly enhances weldability and reduces the risk of intergranular corrosion after welding.
These fittings comply with ASTM A403 / ASME SA403 standard specifications for wrought austenitic stainless steel fittings, covering elbow.
Fittings conforming to ASTM A403 WP304L standards:
Elbows (90°, 45°, 180°)
Equal and reducing tees
Reducers (concentric/eccentric)
Caps and short sections
Cross fittings
Custom-made fittings
All fittings are available in seamless (SMLS) or welded (WELD) versions, conforming to ASME B16.9 and MSS-SP-43 dimensional standards.
Our Products
If you want to know more details and prices of the products, please contact us in time! Email: sales@gneestainless.com
Chemical Composition (ASTM A403 WP304L)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 |
| Silicon (Si) | ≤ 1.00 |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 12.0 |
| Nitrogen (N) | ≤ 0.10 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 485 MPa |
| Yield Strength | ≥ 170 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 217 HB |
| Density | 8.0 g/cm³ |
What is the difference between ASTM A403 WP304 and WP304L?
The difference lies in the carbon content. WP304L has a lower carbon content (≤0.03%), which makes it better for welding applications and more resistant to intergranular corrosion.
Can ASTM A403 WP304L be used for high-temperature service?
Yes, but for prolonged exposure above 425°C, a stabilized grade like 321 or 316Ti is recommended for better carbide stability.
If You Are Looking for ASTM A403 WP304L Pipe Fittings
Gnee is a professional stainless steel supplier with over 18 years of export experience, offering a full range of ASTM A403 WP304L fittings with global certifications such as ISO, SGS, and BV.
We Can Provide:
Product Range: Elbows, tees, reducers, caps, stub ends in seamless and welded types.
Size Range: ½" to 24" (DN15–DN600)
Thickness: SCH5S to SCH160
Surface Finish: Pickled, Bright Annealed, Polished (Mirror / 2B)
Standards: ASTM A403 / ASME SA403, ASME B16.9, MSS SP-43
Certificates: EN10204 3.1 / 3.2, PED Approved
Delivery: 7–15 days with secure export packaging (wooden cases or pallets)
Customization: OEM, marking, and special dimensions accepted.
Email: sales@gneestainless.com
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