WN Flange (Weld Neck Flange)

Overview

Weld Neck Flanges (WN Flanges) are engineered pipe components designed to provide strong, leak-proof connections in high-pressure and high-temperature piping systems. Their tapered hub design allows for smooth stress transfer from flange to pipe, ensuring maximum structural integrity.

Manufactured to international standards, our WN Flanges are ideal for oil & gas, petrochemical, chemical, power generation, and water treatment industries worldwide.

Product Features

  • High-Strength Connection: Tapered hub provides uniform stress distribution, reducing fatigue and stress concentration.

  • Material Excellence: Available in Carbon Steel, Stainless Steel, Alloy Steel, and Duplex Steel for corrosion resistance and mechanical performance.

  • Wide Size Range: DN15 – DN4000 (custom sizes available)

  • Pressure Ratings: ANSI / ASME Class 150 – 2500; PN 6 – PN 400

  • Manufacturing Methods: Forged or machined to ensure precise dimensions and smooth surface finish.

  • Custom Fabrication: Available per project drawings, pressure ratings, or special standards.

Standards Compliance

Our Weld Neck Flanges are produced in strict compliance with major international standards:

  • ASME B16.5 / B16.47 – American standard for pressure-temperature ratings

  • EN 1092-1 – European standard for steel flanges

  • DIN / JIS – Optional for European & Japanese projects

  • GOST 12820 / GOST 12821 – Russian standards

  • Custom Standards – Available upon request

Compliance ensures reliable performance in high-pressure, high-temperature industrial applications.

Materials & Grades

  • Carbon Steel: ASTM A105, ASTM A350 LF2

  • Stainless Steel: ASTM A182 F304 / F316 / F321

  • Alloy Steel: ASTM A182 F11 / F22

  • Duplex / Super Duplex: ASTM A182 F51 / F53

Carefully selected materials provide mechanical strength, corrosion resistance, and long-term reliability.

Applications

Weld Neck Flanges are widely used in:

  • Oil & gas pipelines and processing plants

  • Petrochemical and chemical industries

  • Power generation plants

  • Water treatment and desalination systems

  • High-pressure and high-temperature piping systems

Ideal for critical piping connections where leak-proof performance and safety are paramount.

Why Choose Our Weld Neck Flanges

  • Precision Manufacturing: Smooth hub and accurate bore for stress-free welding

  • Standards Compliance: ASME, EN, DIN/JIS, GOST, and custom project standards

  • Material Excellence: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel

  • Customizable Solutions: Sizes, pressure classes, and standards per drawings or specifications

  • Global Export Experience: Trusted supplier for B2B customers worldwide