ASTM B564 Inconel 625 Nickel Alloy Welding Neck Raised Face Corrosion Resistant Flange

ASTM B564 Inconel 625 WNRF Flange

Product Introduction

Inconel 625 Welding Neck Raised Face Flanges for Corrosive Process Piping

ASTM B564 Inconel 625 WNRF Flanges are forged from UNS N06625 nickel-chromium-molybdenum-niobium alloy and machined with a welding neck and raised face configuration.

The alloy is selected for piping systems where resistance to chloride-containing environments, localized corrosion and elevated-temperature exposure is important. The long tapered hub of the welding neck flange provides a gradual transition from the pipe to the flange body, making this configuration suitable for pressure and cyclic-service piping.

Flange dimensions, bolt-hole patterns and pressure classes can be manufactured according to ASME B16.5, ASME B16.47 or other applicable dimensional standards, while the material forging specification follows ASTM B564.

Technical Specifications

Product Features

• Nickel-Based Alloy Construction

UNS N06625 provides a combination of corrosion resistance and mechanical strength for demanding process environments.

• Welding Neck Geometry

The tapered hub creates a gradual transition between the pipe wall and flange, making the WN configuration suitable for pressure and cyclic loading.

• Raised Face Sealing Surface

The RF configuration provides a defined gasket seating area for bolted piping connections.

• Precision Machined Flange Face

Bolt holes, bore, flange thickness and facing dimensions can be CNC machined according to the applicable dimensional standard.

• Traceable Forged Material

Heat-number traceability and material documentation can be provided for project-controlled applications.

Typical Applications of B564 Inconel 625 Flange

• Chemical Process Piping
• Offshore Process Systems
• Seawater Handling Systems
• Flue Gas Desulfurization Equipment
• Acid Processing Units
• Marine Engineering
• Sour Gas Processing
• High-Temperature Process Piping
• Waste Heat Recovery Systems
• Pollution Control Equipment

Inconel 625 Equivalent / Related Grades

Inspection & Certification

• EN 10204 3.1 Material Certificate
• EN 10204 3.2 Inspection Certificate
• Positive Material Identification (PMI)
• Ultrasonic Testing (UT)
• Liquid Penetrant Testing (PT)
• Hardness Testing
• Dimensional Inspection
• Heat Treatment Record
• Third-Party Inspection Report

Why Use a Welding Neck Flange?

Welding Neck → Butt Weld → Tapered Hub → Gasket Seating → Bolted Joint

• Butt-Weld Connection
• Tapered Hub
• Bore Alignment
• Stress Distribution
• Gasket Seating
• Pressure Cycling
• Thermal Cycling