316 Stainless Steel Flanges

316 stainless steel flanges are the tougher choice for stainless pipework, supplied as A182 F316/L. They contain molybdenum, which helps them resist pitting and chloride attack, so they suit coastal, marine and chemical duties. We hold 316 weld neck, slip-on, blind and threaded flanges to EN1092-1 and ANSI B16.5, so you can match your existing pipework.

316 Stainless Steel Flanges

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What are 316 stainless steel flanges?

316 is an austenitic stainless steel containing around 16% chromium, 12% nickel and 2% molybdenum. The molybdenum is what separates it from 304, and it’s the reason 316 is the usual choice where conditions are tougher.

A flange is the disc-shaped fitting that lets you bolt pipe to pipe, or pipe to a valve, pump or vessel. A 316 flange gives you that bolted joint in a more corrosion-resistant grade.

Which 316 flange ranges do we hold?

Below you’ll find our 316 flanges, sorted by standard:

BS10 flanges: British Standard 10 flanges in Tables D, E and F, ideal for replacing flanges on older British pipework.

EN1092-1 flanges: European flanges sized by DN (nominal diameter) and rated by PN (nominal pressure).

Reduced thickness flanges: thinner, flat-faced flanges for hygienic and metric pipework, drilled to EN1092-1 PN16 or ANSI B16.5 150LB.

All three ranges are made in 316 stainless steel, so they hold up well where chlorides, salts or harsh cleaning products are present. If you’re not sure which one matches your pipework, tell us the size and standard and we’ll point you to the right one.

What does A182 F316/L mean?

A182 is the ASTM specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings and valves. The F shows the flange is forged, and 316 is the grade. The L indicates the low carbon version of the grade.

ASME B16.5 puts F316 in its own material group, separate from 304, because the two grades carry different pressure and temperature ratings. That’s one reason to always state the grade when you ask for a flange.

Why choose 316 over 304?

The molybdenum in 316 improves resistance to pitting and crevice corrosion where chlorides are present. That’s why it’s commonly specified for coastal and marine settings, chemical processing and lines cleaned with chloride-based products.

If the media are mild, our 304 stainless steel flanges may be enough. The difference between 304 and 316 steel is worth weighing up before you decide, because 316 is the more specialised grade.

Which 316 flange types are available?

We hold 316 flanges in the forms most pipework needs:

RFWN flanges (raised face weld neck), for demanding pressure and temperature duties

RFSO flanges (raised face slip-on), welded onto the pipe

RFBL flanges (raised face blind), for closing off a line

SCRD flanges (screwed or threaded), for joints made without welding

RFSO bored O/D flanges, for hygienic and metric outside diameter tube

They’re available to EN1092-1 flanges and ANSI B16.5 flanges. Each form has a different job, so it helps to know whether you’re joining pipe, closing a line or connecting threaded pipework before you choose.

How do you choose the right 316 flange?

1. Confirm the environment.
If chlorides, salts or chloride-based cleaning are involved, 316 is the grade to look at.

2. Match the standard.
Check whether your existing flanges are sized by DN and PN (EN1092-1) or by NPS and class (ANSI B16.5).

3. Pick the form.
Decide between weld neck, slip-on, blind and threaded based on how the joint will be made.

4. Check the face and rating.
The flange needs to suit the one it’s joining.

What are the common ordering mistakes?

The most common mistake is assuming a flange is 316 because it looks stainless. Always check the grade in the product name, which will read F316/L. The second is mixing EN1092-1 and ANSI B16.5, which use different sizing and drilling.

If the flange will sit in a chloride-rich environment, it’s also worth asking whether the pipe and fittings are the same grade, because the flange is only part of the system.

What should you tell us when you enquire?

The quickest way to get the right 316 flange is to start with the size and the standard. Please tell us:

1. The pipe size, either as a DN or NPS size or as the tube’s outside diameter.

2. The standard and rating you need, such as EN1092-1 PN16 or ANSI B16.5 150LB.

3. The flange type, whether that’s slip-on, blind or threaded, and the thread type if it’s a screwed flange.

4. The environment it will be used in, especially if chlorides, coastal air or chloride-based cleaning products are involved.

5. How many you need.

That lets us confirm 316 is the right grade for the job.

Frequently asked questions

What does A182 F316/L mean on a flange?

The code is easy to read once you split it into four parts:

1. A182 is the ASTM (American Society for Testing and Materials) specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings and valves.

2. F shows the flange is forged.

3. 316 is the grade.

4. L means the low carbon version of the grade, which is widely used where flanges will be welded.

Why choose 316 flanges over 304?

316 contains molybdenum, which improves resistance to pitting and crevice corrosion where chlorides are present. That’s why it’s commonly specified for coastal and marine settings, chemical processing and lines cleaned with chloride-based products.

Which 316 flange types do you hold?

We hold 316 flanges in weld neck, slip-on, blind and threaded forms, plus bored O/D slip-on flanges for hygienic and metric tube. They’re available to EN1092-1 and ANSI B16.5, so check which standard your pipework follows.

Is 316 always better than 304?

Not always. 316 is the more specialised grade and it suits tougher conditions, but 304 is often enough when the media are mild. Tell us about your environment and we’ll help you choose the right grade.

Contact Anglo Stainless for more information

Our 316 flanges sit alongside a wide range of 316 butt weld fittings and 316 hygienic fittings. If you’re unsure which flange suits your application, contact us and our team will be happy to help. You can also request our brochure using the form below.