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6" Stainless Steel Pipe

Slice WANTED

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Andre ROUSSEAU12/08/2020 06:25:03
24 forum posts

Can anyone help? I'm after a 15mm wide slice of 6" Outside Diameter (NOT I.D.!) Stainless Steel pipe, approx 4-5mm wall thickness. Not having much luck up to now. Cheers.

Michael Gilligan12/08/2020 06:39:02
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16372 forum posts
714 photos

No promises, but ... You might have more joy if you stick to one system of units

What external diameter do you actually need, and to what tolerance ?

MichaelG.

.

Here’s my first stab [slightly too thick?]

http://www.speedymetals.com/p-4522-6-od-x-250-wall-tube-304-stainless-steel-annealed.aspx

“other suppliers are presumably available’

 

Edited By Michael Gilligan on 12/08/2020 06:47:37

Martin Connelly12/08/2020 10:37:21
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1463 forum posts
168 photos

Not knowing where you are or what you are after this for means we can only generalise. If I was still at work I would get one of my pipe shop friends to cut a piece of 6"nb x sch 40 stainless pipe and cut and weld it into a machinable ring. We never had any outside diameter stainless pipe anywhere near 6", 2.3/4" was the limit I think and the wall thickness was probably14swg.

Another option would be to go to the local sheet metal company and get them to roll a ring of plate to suit followed by welding and machining to size.

A third option is to get a 1.1/2" class 300 (or 2" class 150) flange (preferably from a scrapped pipe) to use as a machinable blank.

The problem with all these options though is holding the part for machining without distorting it.

Martin C

Paul Lousick12/08/2020 11:27:55
1541 forum posts
578 photos

Pipe is specified by nominal bore, not the outside diameter and the wall thickness specified by a schedule. (Sch 40 is the size used for standard water supply)

6" Sch 40 pipe = 6.625" OD with a wall thickness 0.28". (other schedules available but not as common and more expensive).

Tube is specified my its OD but I can only find 6" OD with a 1/8" wall thickness.

Best option would be to get a piece cut from plate.

Paul.

Michael Gilligan12/08/2020 14:38:25
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16372 forum posts
714 photos
Posted by Paul Lousick on 12/08/2020 11:27:55:

[…]

Tube is specified my its OD but I can only find 6" OD with a 1/8" wall thickness.

Paul.

.

My find was 1/4” wall ... so the Goldilocks Zone is somewhere between the two !!

MichaelG.

Paul Lousick13/08/2020 11:33:34
1541 forum posts
578 photos

If 6" x 1/4" tube is available, use that and turn down the ID to the required size. Required length is only 15mm. The problem is finding a supplier who will supply a cut length.

Paul

Andre ROUSSEAU19/08/2020 03:13:20
24 forum posts

Thanks guys but you're not telling me anything I don't already know. Ring-rolling has already been tried with unacceptable results. Pipe ONLY or machined from plate (way TOO expensive). Odd-ball OD's are not uncommon in the oil and gas/chemical industries as are mixed systems of measurement. I am in New Zealand so these potential sources are scarce to put it mildly. My request still remains open.

Paul Lousick19/08/2020 03:49:09
1541 forum posts
578 photos

Hi Andre,

Just as scarce in Australia where I am. Odd-ball diameters may be used in gas/chemical industries but finding a15mm slice will be virtually impossible. Metal suppliers that offer cut to length service normally only sell the common sizes.

Paul.

Hopper19/08/2020 05:02:39
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4804 forum posts
105 photos

What's the problem with ring rolling? Most pipe is rolled and welded anyway. Could you roll and weld a ring out of oversize stock and machine the OD and OD to final size afterwards?

What is the application you want to use the ring for?

Edited By Hopper on 19/08/2020 05:05:33

Michael Gilligan19/08/2020 07:19:42
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16372 forum posts
714 photos
Posted by Andre ROUSSEAU on 19/08/2020 03:13:20:

Thanks guys but you're not telling me anything I don't already know. Ring-rolling has already been tried with unacceptable results. Pipe ONLY or machined from plate (way TOO expensive). Odd-ball OD's are not uncommon in the oil and gas/chemical industries as are mixed systems of measurement. I am in New Zealand so these potential sources are scarce to put it mildly. My request still remains open.

.

dont know It appears that you know everything already ... except for where to buy it locally

... so it might have been useful for you to tell us that you are in New Zealand

Sorry but I know nothing about the local availability off-cuts in your area.

MichaelG.

JohnF19/08/2020 10:02:15
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1024 forum posts
143 photos
Posted by Michael Gilligan on 19/08/2020 07:19:42:
Posted by Andre ROUSSEAU on 19/08/2020 03:13:20:

Thanks guys but you're not telling me anything I don't already know. Ring-rolling has already been tried with unacceptable results. Pipe ONLY or machined from plate (way TOO expensive). Odd-ball OD's are not uncommon in the oil and gas/chemical industries as are mixed systems of measurement. I am in New Zealand so these potential sources are scarce to put it mildly. My request still remains open.

.

dont know It appears that you know everything already ... except for where to buy it locally

... so it might have been useful for you to tell us that you are in New Zealand

Sorry but I know nothing about the local availability off-cuts in your area.

MichaelG.

One of the main reasons for adding at the very least your country in your profile ! Better if you are more specific, county, town but just country would be most helpful

John

Nicholas Farr19/08/2020 10:26:32
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2441 forum posts
1193 photos

Hi JohnF, I don't agree that you need to put any location in ones profile, in such cases as above, you only need to state where in the world you wish to source what one is looking for in ones post.

Regards Nick.

SillyOldDuffer19/08/2020 10:57:13
Moderator
6329 forum posts
1388 photos

Not sure it helps but a couple of near misses can be bought in the UK:

Stainless Steel Pipe 316 168.28mm od x 3.4mm (6" NB Sched 10)

Stainless Steel Pipe 316 168.28mm od x 7.11mm (6" NB Sched 40)

Bit pricey £68, and £114 plus postage for 250mm. No idea if the firm would ship to New Zealand and the postage could be scary! Anyone closer to home like Pipes NZ Ltd?

My local metal supplier sells offcuts but they ain't cheap. Even worse, they're mostly in the useless to me sizes favoured by his commercial customers. Not many machine shops near me, and the nearest emphatically does not allow the public to buy scrap. Nor do any local scrap merchants, these days they're all razor wire and angry dogs!

Dave

Circlip19/08/2020 10:57:21
1197 forum posts

No one's mentioned wire erosion from plate, oh, I just have.

Regards Ian.

Hopper19/08/2020 11:17:30
avatar
4804 forum posts
105 photos

Or water jet cutting from flat plate or from a suitably sized pipe flange.

Might be worth looking around a ships chandlery supplier. They use all kinds of weird and wonderful stainless fittings such as port hole rings etc.

Martin Connelly19/08/2020 17:43:07
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1463 forum posts
168 photos

Flanges? Third post from the top!

Martin C

roy entwistle19/08/2020 19:38:35
1252 forum posts

It's very nearly a washer cheeky

Jeff Dayman19/08/2020 20:50:02
1895 forum posts
45 photos

A blind flange for nominal 150# 4" stainless pipe in the table at link below is 6 3/16" dia between bolt holes and 15/16" thick. If you can get one from a piping / oilfield / marine / chemical plant supply firm it would give you a nice blank to trepan to required ID and OD and reduce to 16 mm thick. It will not be cheap, likely, as any big lump of stainless will not be.

**LINK**

Hopper26/08/2020 06:46:55
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4804 forum posts
105 photos

A curious response in my PM box from the OP re my suggestion of rolling a flat bar into a ring. I don't do PM discussions as it robs from the shared knowledge base of an open forum (and I wouldn't want to waste any more of Andre's valuable time with further suggestions) so leave it here.

From Andre ROUSSEAU

Subject: Ring rolling

I don't own a multi-million dollar CNC-controlled pipe rolling plant. Clearly you haven't attempted the task using typical home workshop equipment.

 

 

   
   
   
   
.

 

Edited By Hopper on 26/08/2020 07:05:07

Paul Lousick26/08/2020 08:28:14
1541 forum posts
578 photos

I am absolutely gob smacked as I had originaly thought about buying a ring rolling machine but did not ralise that they were CNC controlled and cost millions of dollars.

ring roller.jpg

As I cannot afford such an expensive machine, I will have to manually bend a piece of 15 x 5mm flat bar into a ring with a press or by banging it around a piece of old pipe with a hammer and weld it together.. Probably use 16 x 8mm flat to allow for a machining tolerance.

Can anyone advise me if this would work ?

Paul.

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