A182 F304 Socket Weld Flange

QS Flange: Zhejiang A182 F304 Sw Flange

Socket weld flange forged in A182 F304 austenitic stainless steel, welded to small bore pipe for water, food and mild chemical lines.

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One-Minute Overview

Socket weld flange forged in A182 F304 austenitic stainless steel.
The pipe sits in the socket and is fillet welded, keeping the bore aligned.
304 steel resists corrosion in water, food and mild chemical service.
Chosen for small bore stainless lines in water, food, pharmaceutical and chemical plants.

An A182 F304 socket weld flange is the stainless answer to a small bore joint. F304 is the austenitic stainless grade familiar from sheet and tube, forged here into a flange body so the hub carries pressure and bending rather than relying on the weld alone. The pipe end sits inside the socket and is fillet welded on the outside, which lines the bore up without a backing ring or a second welder inside the pipe. Austenitic structure keeps the part tough at low temperature and gives it the general corrosion resistance that makes the grade a default in water and food service.

Fabrication is where most of the value is won or lost. The socket bore and the pipe end must both be clean and free of oil before welding, a small gap is left at the bottom of the socket so the pipe can expand when the weld cools, and the fillet is run with a matching stainless consumable. Because 304 work-hardens and pulls as it cools, tack in at least two places and check the flange face before finishing. Keep stainless tooling away from carbon steel benches to avoid iron contamination, and passivate the weld if the line will see chlorides or washdown. Typical use is water and wastewater, food and beverage, pharmaceutical and light chemical piping. Size, facing and pressure class are confirmed per inquiry, and a detailed specification sheet is available on request.

FAQ

Q1. What does the A182 F304 marking actually tell me?

A182 is the specification for forged austenitic stainless flanges, and F304 is the grade inside it - the austenitic stainless steel most plants already know. It tells you the body was forged rather than cast, and that the chemistry suits water, food and mild chemical service with good toughness at low temperature.

Q2. Will 304 cope with my chemical line, or do I need something higher?

For neutral water, mild acids and most food products, 304 is the sensible starting point. Chlorides are its weak spot: salty or chloride-bearing streams pit it, and that is where a higher grade earns its price. Tell us the fluid and the temperature and we can say whether 304 is realistic.

Q3. Can I weld it with the same rod I use on carbon steel?

Please do not. Carbon steel consumable on a 304 flange leaves a diluted, cracking-prone weld and a rusty ring around the hub within weeks. Use a matching stainless filler, keep a dedicated stainless brush, and do not let the carbon steel grinder touch the joint afterwards.

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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