Weld Neck Flange Ring

Weld Neck Flange Ring

Precision-Machined Forgings for High-Pressure Piping Connections

Our Weld Neck Flange Rings are the fundamental building blocks of high-integrity piping systems. Manufactured from high-grade forged steel, these rings are designed to be machined into finished Weld Neck Flanges or used as custom connection hubs for pressure vessels. They offer superior structural strength and are engineered to handle extreme pressures, heavy loads, and temperature fluctuations.

Key Features & Benefits

• Superior Material Integrity: Produced from vacuum-degassed, killed steel forgings, ensuring a dense, defect-free grain structure that outperforms cast or plate-cut alternatives.

• Optimized for Machining: Supplied in a normalized or annealed condition with controlled hardness, making them easy to machine to specific customer dimensions, bolt patterns, or non-standard facing requirements.

• High-Pressure Capability: The inherent strength of the forged ring design allows for the fabrication of flanges suitable for ASME Class 150 through Class 2500 and higher.

• Versatile Application: Ideal for fabricating custom Weld Neck Flanges, reducing flanges, or special adapter hubs where standard off-the-shelf flanges are unavailable.

• Cost-Effective Fabrication: Allows manufacturers to produce finished flanges in-house by simply machining the bore and bolt holes, reducing lead times for specialized projects.

Technical Specifications

• Manufacturing Process: Open Die Forging / Ring Rolling

• Size Range:

• Nominal Pipe Size (NPS): 1/2" to 60" (DN15 to DN1500)

• Outer Diameter (OD): Custom machined to ASME B16.5, B16.47, or customer drawings.

• Pressure Classes: Class 150, 300, 600, 900, 1500, 2500

• Standards Compliance:

• Flange Dimensions: ASME B16.5, ASME B16.47 Series A & B, EN 1092-1

• Forging Standards: ASTM A105, ASTM A182, ASTM A350, ASTM A694

• Facing Types (Machined to Order): Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF)

Available Materials

We supply Weld Neck Flange Rings in a wide variety of forged materials to suit any service environment:

• Carbon Steel:

• ASTM A105: Standard forging for ambient and high-temperature service.

• ASTM A350 LF2: Low-temperature carbon steel for sub-zero applications (down to -46°C).

• ASTM A694 F52/F60/F65/F70: High-yield steel for high-pressure transmission pipelines.

• Stainless Steel:

• ASTM A182 F304/L, F316/L: For general corrosion resistance.

• ASTM A182 F321, F347: For high-temperature stability.

• Duplex & Super Duplex:

• F51 (2205), F53 (2507): For high strength and chloride resistance.

• Alloy Steel:

• ASTM A182 F11, F22, F91: For high-heat and power generation applications.

Applications

Weld Neck Flange Rings are widely used as raw components for:

• Custom Flange Fabrication: Machine shops and fabricators producing non-standard flanges.

• Oil & Gas Pipelines: High-pressure transmission lines requiring Class 600+ connections.

• Pressure Vessels: Custom nozzles and manways welded directly onto tanks.

• Power Plants: Steam lines and boiler feedwater systems.

• Shipbuilding: Marine piping systems requiring compact, high-strength joints.

Quality Assurance & Packaging

Quality begins with the raw forging. We ensure every ring meets international standards through rigorous testing:

• Ultrasonic Testing (UT): volumetric inspection to detect internal laminations, cracks, or inclusions.

• Mechanical Testing: Verification of Yield Strength, Tensile Strength, Elongation, and Hardness.

• Chemical Analysis: Spectrometer testing to verify alloy composition.

• Impact Testing: Charpy V-Notch testing for low-temperature grades (LF2).

Packaging: Rings are bundled in steel straps or packed in wooden crates, with protective coatings applied to prevent rust during ocean freight.