Class 300 F304/L Stainless Steel Weld Neck, Raised-Face Flange used with Schedule 40S Pipe
Class 300 F304/L Stainless Steel Weld Neck Raised-Face Flange for Schedule 40S Pipe
The Class 300 F304/L Stainless Steel Weld Neck Raised-Face Flange used with Schedule 40S pipe provides a strong, corrosion-resistant connection for demanding industrial pressure piping systems. Manufactured to ASME A/SA182 and ASME B16.5 requirements, this flange combines forged stainless steel construction with a long tapered hub for excellent strength, alignment, and dependable piping performance.
ASME A/SA182 F304/L Stainless Steel
ASTM A182 / ASME SA-182 F304/F304L stainless steel offers excellent general corrosion resistance, mechanical strength, durability, and fabrication characteristics. F304L has a lower carbon content than F304, helping minimize carbide precipitation during welding and supporting corrosion resistance in heat-affected areas.
F304/L stainless steel flanges are widely used in chemical processing, food and beverage production, pharmaceutical manufacturing, water treatment, power generation, utilities, manufacturing, and industrial process piping systems.
Weld Neck Flange for Schedule 40S Pipe
A weld neck flange features a tapered hub that provides a gradual transition from the flange into the connected pipe. The flange is butt welded to compatible Schedule 40S stainless steel pipe, creating a strong, permanent connection while helping distribute mechanical and piping stresses through the hub.
The flange bore should be properly matched to the Schedule 40S pipe wall thickness and inside diameter for proper internal alignment and weld preparation.
The Class 300 designation identifies an ASME pressure class, not a maximum working pressure of exactly 300 PSI. 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 to help establish an effective seal.
ASME B16.5 establishes applicable dimensional, facing, bolting, tolerance, and pressure-temperature requirements.
Selecting an F304/L Schedule 40S Weld Neck Flange
When ordering, verify nominal pipe size, Schedule 40S bore, F304/F304L material, Class 300 rating, RF facing, ASME A/SA182 specification, ASME B16.5 requirements, gasket, bolting, welding procedure, temperature, and process media.