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Class 900 Forged Carbon Steel Weld Neck, Raised-Face Flange for Schedule XH Pipe

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Class 900 A105N Weld Neck Raised-Face Flange for Schedule XH Pipe

The Class 900 ASME A105N Normalized Forged Carbon Steel Weld Neck Raised-Face Flange for Schedule XH Pipe, manufactured to ASME B16.5, provides a strong, dependable connection for demanding industrial pressure piping systems. Combining a tapered weld neck, normalized forged carbon steel construction, and raised-face sealing surface, this flange is engineered for heavy-wall piping applications requiring durability and reliable performance.

ASME A105N Normalized Forged Carbon Steel

Manufactured from ASME SA-105N / ASTM A105N forged carbon steel, this Class 900 weld neck flange undergoes a normalizing heat treatment that refines the steel grain structure and helps provide consistent mechanical properties. The “N” designation identifies the A105 carbon steel as normalized.

A105N forged steel flanges are widely used in oil and gas, petroleum refining, petrochemical processing, chemical plants, power generation, manufacturing, utilities, and high-pressure industrial process piping.

Weld Neck Design for Schedule XH Pipe

A weld neck flange features a long, tapered hub that provides a gradual transition between the flange and connecting pipe. The flange is butt welded to the pipe, creating a strong permanent connection while helping distribute mechanical stresses through the tapered hub.

For Schedule XH (Extra Heavy) pipe, the flange bore can be selected or machined to correspond with the pipe wall thickness and inside diameter. Compared with standard-wall pipe of the same nominal pipe size, XH pipe generally has a thicker wall and smaller inside diameter while maintaining the same outside diameter.

Class 900 Raised-Face Construction

The Class 900 designation represents an ASME pressure class, not a maximum working pressure of 900 PSI. Actual allowable pressure depends on material, size, temperature, and applicable pressure-temperature ratings.

The raised-face (RF) design concentrates bolting force over the gasket seating area to help provide a dependable seal.

ASME B16.5 Flange Requirements

ASME B16.5 establishes applicable dimensions, facings, bolt patterns, tolerances, and pressure-temperature ratings.

When ordering, verify nominal pipe size, Schedule XH bore, Class 900 rating, A105N normalized material, raised face, ASME B16.5 requirements, gasket, bolting, welding procedures, and service conditions.