Carbon Steel Weld Neck Flange

A Carbon Steel Weld Neck Flange is a high-strength, durable pipe flange designed for high-pressure and high-temperature applications. It features a long tapered hub that reinforces the connection, reducing stress and ensuring a strong, leak-proof joint. These flanges are commonly used in critical piping systems in industries such as oil & gas, power plants, and chemical processing.

Specifications & Features:

Material Grades:

• ASTM A105 – Standard forged carbon steel
• ASTM A350 LF2 – Low-temperature carbon steel
• ASTM A516 Gr. 70 – Pressure vessel quality steel
• ASTM A694 – High-yield strength carbon steel for high-pressure applications

Design & Standards:

• ANSI / ASME B16.5 – For pipe flanges up to 24 inches
• ANSI / ASME B16.47 – For large diameter flanges (Series A & B)
• DIN, EN, JIS, BS, GOST, IS – Available per international specifications

Size & Pressure Ratings:

• Nominal Pipe Size (NPS): 1/2″ to 60″
• Pressure Ratings:
  • Class 150
  • Class 300
  • Class 400
  • Class 600
  • Class 900
  • Class 1500
  • Class 2500
  • PN6, PN10, PN16, PN25, PN40, PN64, PN100

Flange Face Types:

• Raised Face (RF) – Standard for high-pressure applications
• Flat Face (FF) – Used when mating with other flat surfaces
• Ring Type Joint (RTJ) – For critical high-pressure and high-temperature applications

Key Features & Benefits:

• Long Tapered Hub – Provides structural reinforcement, reducing stress concentration
• Strong Welded Connection – Ensures a leak-proof joint in high-pressure applications
• High Mechanical Strength – Withstands extreme temperatures and pressures
• Versatile Usage – Suitable for pipelines handling gas, steam, and liquids
• Enhanced Corrosion Resistance – Can be galvanized, coated, or made from corrosion-resistant materials

Applications:

• Oil & Gas Industry – High-pressure pipeline systems and refineries
• Petrochemical & Chemical Plants – Handling corrosive and hazardous fluids
• Power Plants – Steam, water, and gas pipeline connections
• Shipbuilding & Marine Industry – Seawater and offshore piping systems
• Pharmaceutical & Food Processing – Hygienic and durable pipeline connections

Surface Treatment Options:

• Black Painted – Protects against rust during storage and transportation
• Hot-Dip Galvanized (HDG) – Provides excellent corrosion resistance
• Anti-Rust Oil Coated – Prevents oxidation
• Electroplated Zinc Coating – Improves durability and lifespan

Advantages Over Other Flange Types:

• Superior Strength & Durability – Ideal for high-pressure applications
• Leak-Proof Joint – Provides a reliable, welded connection
• Better Stress Distribution – Reduces bending stress at the base of the flange
• Long Service Life – Withstands harsh environments and extreme temperatures