ASTM A182 F304L Flange

QS Flange: Wuxi ASTM A182 F304L Flange

Forged ASTM A182 F304L weld neck flange, 3 inch 300LB RF in low-carbon W.Nr.1.4306, for welded lines needing intergranular corrosion resistance.

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One-Minute Overview

Weld neck flange in low-carbon F304L, 3 inch size, 300LB class with an RF face.
Forged to ASTM A182 from W.Nr.1.4306; dimensions follow ASME B16.5.
Low carbon limits carbide precipitation, protecting welded joints from intergranular attack.
Keeps toughness at low temperature and suits welded corrosive-service piping.

The ASTM A182 F304L weld neck flange is the low-carbon answer for welded stainless lines in the 300LB class. Forged from W.Nr.1.4306 to ASTM A182 and dimensioned to ASME B16.5, it brings the usual WN benefits — a tapered hub and a raised face — to 3 inch piping where welds cannot afford intergranular corrosion.

Name: ASTM A182 F304L Flange
Size: 3"
Pressure: 300LB
Material: W.Nr.1.4306 (F304L)
Type: WN
Flange Face: RF
Process: Forged
Standard: ASTM A182, ASME B16.5

The low-carbon grade pays off wherever welding is part of the job. Because F304L holds carbon at very low levels, carbide precipitation during welding stays minimal and the heat-affected zone keeps its corrosion resistance, which is exactly what petrochemical lines and welded process piping need. Select by size and pressure class, then match the RF gasket to the medium. Butt weld the hub to a prepared pipe end, keep the root sound, and tighten bolts in a star pattern so the raised face loads the gasket evenly. The tapered hub spreads stress away from the weld, and the forged body avoids the porosity of castings. F304L also stays ductile at low temperature, so the same flange can serve lines that swing cold. Clean the raised face before assembly and store the flange covered to protect the machined surfaces. Order the flange with the mating gasket and bolting set so the raised face arrives protected and the joint goes together in one pass.

FAQ

Q1. Why specify F304L instead of regular F304 on welded lines?

F304L keeps carbon at very low levels, so carbide precipitation during welding stays minimal and the welded zone retains its corrosion resistance. Regular F304 can sensitize at the weld and invite intergranular attack, which is why welded corrosive-service lines call for F304L.

Q2. What does forging to ASTM A182 add to this flange?

Forging to ASTM A182 gives a fine, uniform grain and the strong stiffness a pressure-boundary part needs, free of the porosity castings can hide. The ASME B16.5 dimensions then guarantee the flange mates with matching 3 inch 300LB components in the field.

Q3. Can one flange really cover both hot service and cold swings?

The WN geometry and forged F304L body handle pressure and thermal cycling, and the low-carbon grade stays ductile at low temperature. Within the stated class and gasket limits, the same flange serves lines that run hot and lines that swing cold.

Q4. What payment terms do you accept?

T/T, L/C at sight and other internationally accepted terms. The exact terms are agreed with you before production starts, because the payment schedule has to match the order value, the shipping method and the delivery schedule you need — which is also why we confirm them up front rather than after shipment.

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