Class 300 Forged Carbon Steel Weld Neck, Raised-Face Flange for Schedule 40 Pipe
Class 300 A105/SA-105 Weld Neck Raised-Face Flange for Schedule 40 Pipe
The Class 300 ASTM A105/ASME SA-105 Forged Carbon Steel Weld Neck Raised-Face Flange for Schedule 40 Pipe provides a strong, permanent connection for demanding industrial pressure piping systems. Its forged carbon steel construction, tapered weld neck, Schedule 40 bore, and raised-face sealing surface provide dependable strength, alignment, and sealing performance.
ASTM A105 / ASME SA-105 Forged Carbon Steel
Manufactured from ASTM A105 / ASME SA-105 forged carbon steel, this Class 300 weld neck flange offers excellent mechanical strength, toughness, and durability. A105/SA-105 is widely specified for pressure-containing piping components used in oil and gas, petrochemical processing, refineries, power generation, chemical processing, manufacturing, utilities, and industrial process piping systems.
The Class 300 designation identifies an ASME pressure class rather than a maximum operating pressure of 300 PSI. Actual allowable pressure depends on material, operating temperature, and applicable pressure-temperature ratings.
Weld Neck Design for Schedule 40 Pipe
A weld neck flange features a long tapered hub that creates a gradual transition between the flange body and connecting pipe. The flange is butt welded directly to Schedule 40 pipe, creating a strong permanent joint while helping distribute mechanical and piping stresses through the tapered hub.
The flange bore can be machined to correspond with the Schedule 40 pipe wall thickness and inside diameter, helping provide proper internal alignment and a smooth transition through the butt-weld connection.
Raised-Face Flange Construction
The raised-face (RF) flange features an elevated gasket seating surface surrounding the bore. This design concentrates bolting force over the gasket area, helping establish a dependable seal between compatible mating flanges.
Class 300 A105/SA-105 weld neck flanges are commonly manufactured to applicable ASME B16.5 dimensional and pressure-temperature requirements.
When ordering, verify nominal pipe size, Schedule 40 bore, Class 300 rating, raised-face configuration, A105/SA-105 material, dimensional requirements, and service conditions for proper fit and reliable industrial piping performance.