A182 F304 Slip On Flange

QS Flange: Zhejiang A182 F304 So Flange

Slip on flange forged from A182 F304 austenitic stainless steel, welded over the pipe end for water and general chemical service.

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One-Minute Overview

Slip on flange forged from A182 F304 austenitic stainless steel.
Forging keeps the grain flow continuous through hub and flange ring.
Grade 304 suits water, food contact and general chemical duty.
Size, pressure class and facing stay open until your inquiry is confirmed.

A182 F304 is the forged austenitic stainless route rather than a casting, and that matters at the hub where the pipe load enters the flange. Forging carries the grain flow around the bore and out into the flange ring instead of leaving it cut off at a cast surface, so the part takes bending and vibration at the weld without the porosity risk a casting can hide. The flange slips over the pipe end and is fillet welded inside and out, and the 18-8 chemistry of F304 keeps the pressure boundary sound in water and in general chemical service.

Because the two welds sit on the outside and inside of the bore, the joint is simple to fit and forgiving of pipe cut length, which is why slip on flanges are common on lower pressure water, utility and process lines. Grade 304 has no titanium or niobium addition, so on thick sections that stay hot for a long time the welded zone can sensitise; where the service runs hot and steady, a stabilised grade or a post weld clean up is worth discussing at the inquiry stage. After welding, clean the spatter and passivate the affected area so the oxide layer recovers. Size, pressure class and facing are confirmed per inquiry, and detailed specifications and drawings are available on request.

FAQ

Q1. What does the A182 F304 designation tell me?

It says the flange is forged from 304 austenitic stainless steel under the A182 specification for forged or rolled pipe flanges. The forging route gives a denser part than a casting at the hub, where the weld and the pipe load meet.

Q2. Where does grade 304 stop being the right choice?

In chloride rich or strongly reducing media, and in hot thick sections that stay at temperature long enough to sensitise the welded zone. Grade 304 has no stabilising addition, so for those duties a molybdenum bearing or stabilised grade is the more honest answer.

Q3. How tight should the two fillet welds be?

Both welds are structural: the hub weld carries the axial thrust and the bore weld seals the medium. Weld to a qualified procedure for the thickness involved, keep the flange square while tacking, and let the second weld cool before you torque the joint up.

Q4. How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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