ASTM A403 WP316L Caps | SA403 316/316L Pipe Caps ASME B16.9

We are a professional manufacturer of ASTM A403 WP316L pipe caps and SA403 WP316/316L stainless steel caps in China. Our products are manufactured in strict accordance with ASME B16.9 standards, ensuring dimensional accuracy, corrosion resistance, and long-term performance in industrial piping systems.

ASTM A403 WP316L caps are wrought austenitic stainless steel butt weld fittings designed to seal the ends of pipelines. With excellent resistance to corrosion, pitting, and chloride environments, WP316L pipe caps are widely used in chemical processing, oil & gas, marine, food processing, and pharmaceutical industries.

Product Specifications

Standard: ASTM A403/ ASME SA403
Dimensional Standard: ANSI / ASME B16.9, B16.28, MSS SP-43
Type: Butt Weld Pipe Caps
Manufacturing: Seamless / Welded
Material: WP316 / WP316L Stainless Steel

Size Range

• 1/2″ NB to 48″ NB

• Schedules: SCH 10S, 40S, 80S, 160S, XXS

Starting Material

High-quality stainless steel plates or pipes.

ASTM A403 WP316L Chemical Composition (%)

Mechanical Properties

Features of ASTM A403 WP316L Caps

• Excellent corrosion resistance

• Superior resistance to chloride environments

• Good weldability and formability

• Suitable for high-temperature applications

• Low carbon content reduces risk of intergranular corrosion

Available Pipe Fittings Materials

Stainless Steel:
ASTM A403 WP304 / 304L / 304H / 316 / 316L / 317 / 317L / 321 / 310 / 347 / 904L

Alloy Steel:
ASTM A234 WP5 / WP9 / WP11 / WP22 / WP91

Carbon Steel:
ASTM A234 WPB / A420 WPL3 / WPL6 / MSS SP-75 WPHY Grades

Quality & Inspection

• EN10204 3.1 Mill Test Certificate provided

• In-house inspection and third-party inspection available

• Standard marking or customized marking

• Export packing: fumigation-free wooden cases or as required

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