SS 316 SO Flange

QS Flange: Wenzhou SS 316 SO Flange

Forged A182 F316 SO flange, 4 inch 300LB RF per ANSI B16.5, for corrosive service where 316 stainless resists acids and chlorides.

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One-Minute Overview

Forged A182 F316 SO flange that connects equipment or pipe by fillet weld.
4 inch size rated 300LB, raised face, ANSI B16.5 dimensions.
316 stainless steel resists acids, alkalis and chloride solutions.
Choose it for medium to high pressure lines in corrosive duty.

The SS 316 SO flange covers 4 inch piping that runs at the 300LB class, where ordinary 150LB parts would be under-rated. It is forged from A182 F316 stainless steel, a molybdenum-bearing grade that stands up to acids, alkalis and chloride solutions far better than basic 304. Dimensions follow ANSI B16.5, so gasket selection, bolting and mating flanges stay standard. Pick this grade when the media rules out plain 304: brackish water, dilute acids, caustic washes and coastal atmospheres are the usual cases.

Name: SS 316 SO Flange
Size: 4"
Pressure: 300LB
Material: A182 F316
Flange Face: RF
Process: Forged
Standard: ANSI B16.5

Because the flange is attached by fillet weld directly, crews fit it to nozzles, skids and valve outlets without preparing a butt-weld end. The raised face keeps gasket seating stress high even at 300LB, and the 316 chemistry keeps the joint sound in brackish water, process chemicals and outdoor marine air. Check the mating flange is also 300LB class before tightening. For welding, use a procedure qualified for 316 stainless and keep heat input low so the face stays flat.

FAQ

Q1. What does the 300LB class actually mean for this flange?

It sets the pressure-temperature capability of this 4 inch flange well above the 150LB class of the same size. Bolt circle, thickness and facing are dimensioned to ANSI B16.5 for Class 300, so the flange only mates with other Class 300 components of the same size.

Q2. Can I bolt this 300LB flange onto a 150LB line?

You can hold it next to the pipe and admire it, but please do not bolt it on. The drilling of a 300LB flange does not match 150LB, and pressure class must agree across the joint. Match size and class on both sides and the bolting lines up first try.

Q3. Why choose A182 F316 over standard 304 stainless?

A182 F316 adds molybdenum, which markedly improves resistance to pitting in chloride solutions, acids and alkalis. Where 304 is adequate for clean water and mild duty, 316 keeps the face and bolt holes sound in corrosive service and avoids early replacement of the flange.

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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