ASTM A403 WP304L Pipe Caps | SA WP304/304L ASME B16.9
ASTM A403 WP304L pipe caps are stainless steel butt weld fittings manufactured in accordance with ASME B16.9 dimensional standards. Also designated as ASME SA403 WP304L, these pipe caps are designed to seal the ends of pressure piping systems and provide reliable corrosion-resistant performance.
WP304L is a low-carbon austenitic stainless steel grade offering excellent weldability and resistance to intergranular corrosion. ASTM A403 WP304L pipe caps are widely used in chemical processing, oil & gas, food processing, water treatment, and general industrial piping systems.
As a professional stainless steel pipe fittings manufacturer, we supply high-quality SA WP304/304L pipe caps with strict quality control, full traceability, and global export support.
Product Specifications
Material Grade: ASTM A403 WP304L / ASME SA403 WP304L
Dimensional Standard: ASME B16.9
Type: Stainless Steel Butt Weld Pipe Cap
Manufacturing: Seamless / Welded
Size Range
1/2” NB – 48” NB
Wall Thickness
SCH 10S, SCH 40S, SCH 80S, SCH 160S, XXS
Chemical Composition of WP304L (%)
| C | Mn | Si | P | S | Cr | Ni |
|---|---|---|---|---|---|---|
| ≤0.035 | ≤2.0 | ≤1.0 | ≤0.040 | ≤0.030 | 18–20 | 8–12 |
Low carbon content reduces carbide precipitation during welding and improves corrosion resistance.
Mechanical Properties
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Tensile Strength: ≥ 485 MPa
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Yield Strength: ≥ 170 MPa
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Elongation: ≥ 35%
Features of ASTM A403 WP304L Pipe Caps
✔ Excellent corrosion resistance
✔ Superior weldability
✔ Good oxidation resistance
✔ Suitable for pressure piping systems
✔ Long service life
Applications
ASTM A403 WP304L stainless steel pipe caps are widely used in:
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Chemical and petrochemical plants
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Oil & gas pipelines
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Food and beverage processing
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Pharmaceutical industries
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Water treatment facilities
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Power generation systems
WP304L vs WP316L Pipe Caps
| Grade | Corrosion Resistance | Chloride Resistance | Cost | Typical Use |
|---|---|---|---|---|
| WP304L | Good | Moderate | Lower | General industry |
| WP316L | Superior | High | Higher | Marine & chemical |
WP316L contains molybdenum, providing better resistance to chloride and marine environments, while WP304L is more economical for general applications.
About ASTM A403 Standard
ASTM A403 covers wrought austenitic stainless steel piping fittings for pressure service. The specification ensures chemical composition, mechanical properties, and testing requirements meet industrial standards for safety and reliability.
Quality Assurance
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EN10204 3.1 Mill Test Certificate provided
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Third-party inspection available (SGS / BV / TUV)
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Full heat number traceability
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Standard or customized marking
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Export-grade wooden case packing
Frequently Asked Questions
What is ASTM A403 WP304L?
ASTM A403 WP304L is a low-carbon stainless steel grade used for butt weld pipe fittings with improved weldability and corrosion resistance.
What is the difference between WP304 and WP304L?
WP304L has lower carbon content, reducing the risk of intergranular corrosion after welding.
Is WP304L suitable for food industry?
Yes, WP304L stainless steel is commonly used in food and beverage processing due to its corrosion resistance and hygienic properties.
What temperature is WP304L suitable for?
WP304L is generally suitable for service temperatures up to approximately 870°C, depending on system design.
ASTM A403 WP304L stainless steel pipe caps ASME B16.9
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ASTM A403 WP304L Tees
