A ‌WN flange‌ (Welding Neck Flange) is a high-performance pipe flange designed for critical applications requiring robust connections under extreme pressure, temperature, or stress conditions. 

1. ‌Structure & Design‌

• ‌Long Tapered Neck‌: Features an extended neck that is butt-welded to the pipe, providing structural reinforcement and stress distribution‌.

• ‌Sealing Faces‌: Commonly uses ‌RF (Raised Face)‌, ‌FF (Flat Face)‌, or specialized profiles like  (FM/M) for high-pressure sealing‌.

2. ‌Key Advantages‌

• ‌High Pressure/Temperature Resistance‌: Ideal for harsh environments (e.g., oil/gas, chemical plants) due to its welded joint integrity‌.
• ‌Leak Prevention‌: The welded connection minimizes leakage risks compared to slip-on or threaded flanges‌.
• ‌Alignment Stability‌: The neck acts as a natural reinforcement, reducing vibration-induced misalignment‌ .

3. ‌Applications‌

• ‌Critical Pipelines‌: Used in high-pressure steam, hydrocarbons, and toxic/flammable fluid systems‌ .

• ‌Equipment Connections‌: Connects pumps, valves, and pressure vessels in refineries/power plants‌ .

4. ‌Standards & Materials‌

• ‌Standards‌: Complies with ‌ANSI B16.5‌, ‌ASME B16.47‌, ‌HG/T‌ (China), and ‌DIN‌ (Europe)‌ .
• ‌Materials‌: Carbon steel (A105), stainless steel (304/316), and alloy steels (A182 F11)‌ .