Class 900 Forged Carbon Steel Threaded, Raised-Face Flange
Class 900 A105N Forged Carbon Steel Threaded Raised-Face Flange
The Class 900 A105N Normalized Forged Carbon Steel Threaded Raised-Face Flange manufactured to ASME B16.5 provides a strong, high-pressure connection for industrial piping systems where a threaded installation is required. Combining forged carbon steel construction, normalized material properties, internal pipe threads, and a raised-face sealing surface, this flange delivers dependable performance in demanding piping applications.
ASTM A105N Normalized Forged Carbon Steel
Manufactured from ASTM A105N forged carbon steel, this Class 900 threaded flange receives a normalizing heat treatment that refines the steel grain structure and helps provide consistent mechanical properties. The “N” designation identifies the material as normalized A105 carbon steel.
A105N flanges are commonly specified for oil and gas, petroleum refining, petrochemical processing, chemical plants, power generation, manufacturing, utilities, and high-pressure industrial process piping.
Class 900 Threaded Flange Design
A threaded flange incorporates internal pipe threads that connect directly to compatible externally threaded pipe. Because the pipe-to-flange connection does not require welding, threaded flanges can be useful where welding is impractical, restricted, or undesirable.
Thread form, pipe material, nominal pipe size, operating conditions, and service compatibility must be verified for the specific piping system.
The Class 900 designation represents an ASME pressure class and does not mean the flange has a maximum working pressure of 900 PSI. Actual allowable pressure depends on material, size, temperature, and applicable pressure-temperature ratings.
Raised-Face Flange Construction
The raised-face (RF) design features an elevated gasket seating surface that concentrates bolting load over the gasket area, helping establish a dependable seal with a compatible mating flange.
ASME B16.5 Flange Requirements
ASME B16.5 establishes applicable requirements for flange dimensions, facings, bolt patterns, tolerances, and pressure-temperature ratings.
When ordering, verify nominal pipe size, Class 900 rating, thread requirements, A105N normalized material, raised-face configuration, ASME B16.5 compliance, gasket selection, bolting, and service conditions.