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Class 900 Forged Carbon Steel Weld Neck, Raised-Face Flange for Schedule 40 Pipe

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Class 900 A105N Weld Neck Raised-Face Flange for Schedule 40 Pipe

The Class 900 ASME A105N Normalized Forged Carbon Steel Weld Neck Raised-Face Flange for Schedule 40 Pipe, manufactured to ASME B16.5, provides a strong, dependable connection for demanding industrial pressure piping systems. Its tapered weld neck, normalized forged carbon steel construction, and raised-face sealing surface make it an excellent choice for critical piping applications.

ASME A105N Normalized Forged Carbon Steel

Manufactured from ASME SA-105N / ASTM A105N forged carbon steel, this Class 900 weld neck flange receives 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 commonly specified for oil and gas, petroleum refining, petrochemical processing, chemical plants, power generation, manufacturing, utilities, and high-pressure industrial process piping systems.

Weld Neck Design for Schedule 40 Pipe

A weld neck flange incorporates a long, tapered hub that provides a gradual transition from the flange body to the connecting pipe. The flange is attached using a butt weld, creating a strong permanent connection while helping distribute mechanical stresses through the tapered hub.

For Schedule 40 pipe, the flange bore can be selected or machined to correspond with the pipe wall thickness and inside diameter, promoting smooth internal alignment through the welded connection.

Class 900 Raised-Face Construction

The Class 900 designation represents an ASME pressure class rather than a maximum operating pressure of 900 PSI. Actual allowable pressure depends on material, size, operating temperature, and applicable pressure-temperature ratings.

The raised-face (RF) design features an elevated gasket seating area that concentrates bolting force over the gasket, helping establish 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 40 bore, Class 900 rating, A105N normalized material, raised face, ASME B16.5 requirements, gasket, bolting, welding procedures, and service conditions.