RF F304 Flange

QS Flange: Quanzhou F F304 Flange

Forged ASTM A182 F304 SO flange with RF face, 4 inch 150LB per ANSI B16.5, for fillet-welded connections to valves and pipe.

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One-Minute Overview

Forged ASTM A182 F304 slip on flange with a raised face for 4 inch joints.
150LB class, ANSI B16.5 dimensions, bolted to valves or pipe ends.
F304 resists corrosion in water, steam and many chemical media.
Fillet welded straight to the valve or pipe — quick fit-up, easy inspection.

This RF F304 flange is a 4 inch Class 150 slip on flange forged from ASTM A182 F304 stainless steel. It bolts to valves or pipe ends and is attached with a fillet weld, so installation is fast and the weld is easy to check. The raised face gives the gasket an even sealing surface, and ANSI B16.5 dimensions keep it interchangeable with standard 150LB hardware.

Name: RF F304 Flange
Type: SO
Size: 4"
Pressure: 150LB
Material: ASTM A182 F304
Flange Face: RF
Process: Forged
Standard: ANSI B16.5

F304 covers a lot of ground: water and steam lines, many chemicals, and food or pharma utilities where carbon steel would rust. In oil, gas and petrochemical plants it is a common choice for vent, drain and instrument connections around valves. The slip on body is fillet welded to the valve neck or pipe, which shortens fit-up compared with butt-weld ends. Pick the gasket for the RF face, follow the class 150 bolt pattern, and torque in a star sequence so the seal loads evenly.

FAQ

Q1. How is this flange attached to the valve or pipe?

It is a slip on (SO) type: the flange slides over the valve neck or pipe end and is secured with a fillet weld on both sides. That makes fit-up quick and leaves the weld easy to inspect, which is handy for vent, drain and instrument connections around valves.

Q2. Where does an F304 RF flange earn its keep?

Water, steam, many chemicals, and the vent and drain points around valves in oil, gas and petrochemical plants. If carbon steel would rust in your service, F304 is usually the sensible step up — and the raised face keeps gasket sealing simple.

Q3. Is 150LB enough for my line, or am I cutting it fine?

Class 150 is the rating of the flange, and it is generous for most utility and process duties at moderate pressure and temperature. Check your line's design conditions against the class — and when in doubt, ask; a quick calculation beats a leak test you did not plan.

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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