ASTM A182 F316/316L Stainless Steel Flange ASME B16.5 Forged Weld Neck / WNRF Flange

The ASTM A182 F316/316L WNRF flange offers a robust, weldable, and corrosion-resistant joint suitable for critical industrial piping systems. Its dual certification, high-strength hub design, and compliance with ASME B16.5/B16.47 make it a preferred choice for engineers requiring reliability in aggressive or high-pressure environments.

Basic Function of Steel Weld Neck Flange

A flange is a mechanical connector that joins two sections of pipe, valves or equipment while allowing disassembly. The WN Flange works by:

• Permanent attachment to the pipe via a full-penetration butt weld.

• Removable bolted connection to the mating flange (another WNRF, a blind flange, or equipment flange).

• Sealing through a compressed gasket between the two flange faces.

Equivalent Materials of ASTM A182 F316L Stainless Steel WNRF Flange

Chemical Composition % of ASTM A182 F316L Stainless Steel WNRF Flange

How it Resists Leakage

Leakage occurs when internal pressure pushes the gasket outward, reducing contact stress. The WNRF design counters this through:

• High bolt stiffness (short bolt span due to compact flange geometry).

• Strong hub prevents flange rotation (bending apart under pressure).

• Controlled gasket compression – ASME B16.5 defines allowable bolt loads.

Application

• Chemical & Petrochemical processing (handling corrosive fluids)

• Oil & Gas (onshore/offshore, refineries)

• Power generation (including nuclear auxiliary systems)

• Marine & shipbuilding (seawater systems)

• Pharmaceutical & food processing (hygienic and corrosion-resistant needs)

• LNG and cryogenic services (good toughness at low temperatures)