SS 316 WN Flange

QS Flange: Yuyao SS 316 WN Flange

Forged SS 316 weld neck flange, 4 inch 300LB RF to ASME B16.5, with the chloride resistance marine and chemical lines need.

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One-Minute Overview

Forged 316 stainless steel weld neck flange with a long tapered hub.
4 inch, Class 300LB, RF face dimensioned to ASME B16.5.
Chloride resistance for marine, chemical and aggressive fluid service.
Pairs with spiral-wound gaskets for high temperature steam and refinery lines.

The SS 316 WN flange brings 316 stainless steel's chloride resistance to a 4 inch Class 300LB weld neck joint. Forged rather than cast, the body avoids porosity and keeps its mechanical properties under fluctuating thermal and mechanical loads. The long tapered hub smooths stress distribution and reduces erosion at the joint, and the raised face follows the ASME B16.5 default for classes up to 600.

Name: SS 316 WN Flange
Size: 4"
Pressure: 300LB
Material: SS 316
Flange Face: RF
Process: Forged
Standard: ASME B16.5

Where carbon steel would pit, 316 holds: marine pipework, chemical transfer stations, refinery systems and high temperature steam lines. Paired with a spiral-wound gasket with 316 windings and flexible graphite filler, the joint is rated for demanding temperatures — graphite fillers handle service up to about 550°C — and resists a wide range of corrosive media. Specify Class 300LB when the design pushes past Class 150 limits, and keep the mating flange, studs and gasket in the same class. Butt weld the neck to the pipe and tighten in a cross pattern to the gasket guidance.

FAQ

Q1. Why choose SS 316 over standard 304 for this weld neck flange?

316 adds molybdenum, which upgrades chloride resistance — the weakness that pits 304 in marine air, brackish water and many chemical media. In aggressive fluid handling, that difference shows up as longer service life and fewer shutdowns to replace corroded flanges in the field.

Q2. What gasket plays well with this flange?

A spiral-wound gasket with 316 stainless windings and flexible graphite filler is the usual match. The graphite filler takes service up to about 550°C, and the 316 windings stay on the same corrosion page as the flange, so the whole joint ages together.

Q3. Can it handle a line that is hot, wet and mildly evil?

If by evil you mean chloride-laden and hot, yes — that is the 316 pitch. Give it a spiral-wound gasket with graphite filler, torque the studs in a cross pattern, and the joint will handle about 550°C service while your corrosive fluids file complaints that go nowhere.

Q4. What's the minimum order quantity?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Parts made to your drawing or to a non-standard bolt pattern are quoted one by one, because the minimum really depends on the material and the tooling involved.

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