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Large Diameter Butt Weld Pipe Fittings, ASTM A403 WP347-WX Equal Tee for Corrosive Fluids B16.9 

A Large Diameter Butt Weld Equal Tee, manufactured in compliance with ASTM A403 WP347-WX, is a forged pipe fitting used to connect three pipes of the same nominal diameter at a 90-degree angle. The "Butt Weld" designation indicates that the fitting features beveled ends, designed to be installed by butt welding directly to pipes, creating a permanent, leak-proof, and high-strength joint suitable for high-pressure and high-temperature service. Austenitic Stainless Steel WP347(UNS S34700), offering excellent resistance to intergranular corrosion after welding. The "WX" classification is a critical quality designation: it signifies that all longitudinal welds (if fabricated) have undergone 100% radiographic. Offering excellent resistance to intergranular corrosion after welding and high mechanical strength, making it ideal for corrosive environments in industries such as chemical processing, petrochemical, and power generation.

Fitting Classes for WP Grades

Compared to unstabilized stainless steels such as 304 or 304L, 347 exhibits higher creep rupture strength at high temperatures. This allows it to operate stably for extended periods in high-temperature environments ranging from 500°C to 800°C, resisting deformation and damage at high temperatures.

Chemical & Mechanical Properties

*The niobium (columbium) content shall be not less than ten times the carbon content and not more than 1.10 %.

Mechanical Properties

Key Adventages

• WX classification of ASTM A403 ensures the welds are free from internal defects such as porosity, slag inclusion, or lack of penetration, guaranteeing leak-proof reliability under critical service conditions. It is especially suitable for high-safety industries like petrochemical and nuclear power.
• Manufactured from stabilized austenitic stainless steel WP347 (UNS S34700), the addition of niobium provides excellent resistance to intergranular corrosion. Even after welding or under high-temperature environments, it effectively resists intergranular attack, ensuring long-term stable operation in corrosive media.
• Featuring a butt-weld design with factory-prepared beveled ends, welding creates a permanent, integral structure with the pipe. The welded joint strength can reach over 90% of the base metal strength , enabling it to withstand high pressure, high temperature, vibration, and fatigue loads. This fundamentally eliminates the risk of loosening and leakage associated with threaded or flanged connections.

Key Applications

• Petrochemical & Oil Refining
• Chemical & Fine Chemical Processing
• Power Generation (Nuclear & Thermal)
• Offshore Engineering & Shipbuilding
• Pharmaceutical & Food Processing
• Pulp & Paper Industry