dern
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| posted on 19/10/04 at 09:25 PM |
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Ordering metal - terms - help
Hi,
I'm just putting an order together for steel for my chassis through parkers steel and just want to check I've got the right stuff.
Book: 1in x 1in 16swg RHS steel tube
I've chosen 25x25x1.5mm wall ERW semi-bright tube
Book: 3/4in x 3/4in 16swg RHS steel tube
I've got 20x20x1.5mm wall ERW semi-bright tube
Book: 3/4in 16swg rounf tube
I've got 19x1.5mm round ERW
Book: 16swg sheet steel
I've got 1.5mm BS EN10130 CRGP which I found under "Black carbon sheet & plate/plate/cold rolled general purpose"
...and some 3mm sheet of the same type as the 16swg (which is relatively expensive).
Does the specifications seem ok to everyone?
Thanks,
Mark
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Mark Allanson
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| posted on 19/10/04 at 09:46 PM |
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Its just a more modern terminology, just dont use the round tube for your wishbones, ERW is not up to the job
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Screwy
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| posted on 19/10/04 at 09:47 PM |
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I think you,ll find that you actually want the RHS (rectangular hollow section) rather than the ERW (Electric Resistance Welded) The ERW has a
welded seam that can weaken one side of the tube iirc . I,m pretty sure someone more qualified than myself will drop by and confirm .
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JoelP
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| posted on 19/10/04 at 09:50 PM |
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erw is what nearly everyone uses for the main chassis parts. it does have a seam inside but thats not such a major problem.
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blueshift
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| posted on 19/10/04 at 10:16 PM |
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when you say RHS you tend to get ERW. RHS just specifies the shape, not the method used to form it.
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Mark Allanson
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| posted on 19/10/04 at 10:34 PM |
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RHS=ERW=RHS
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Peteff
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| posted on 19/10/04 at 11:40 PM |
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Square and rectangular section is all ERW in my experience, I don't think anyone does anything different. DOM and CDS are usually round or oval
section. CDS is what you want for wishbones.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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dern
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| posted on 20/10/04 at 08:35 AM |
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Thanks everyone.
CDS stands for cold drawn steel doesn't it? On parker's the closest I can find to that description is "Cold Formed Hollow
Section" but the 20mm diameter stuff (21.3mm) has 3mm wall thickness which seems a bit thick to me. Does that sound like the right stuff to use?
The only tube with a wall of 1.5mm is the ERW.
Regards,
Mark
[Edited on 20/10/04 by dern]
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Terrapin_racing
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| posted on 20/10/04 at 10:41 AM |
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I would use the 3mm wall thickness
Rob
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Alan B
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| posted on 20/10/04 at 01:35 PM |
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RHS is not available in 1.5 wall thickness.
The book terminology is wrong.
ERW square tube is really the intended material.
Apologies for mentioning this on numerous occasions....
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Mark Allanson
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| posted on 20/10/04 at 05:39 PM |
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quote:
Originally posted by dern
Thanks everyone.
CDS stands for cold drawn steel doesn't it? On parker's the closest I can find to that description is "Cold Formed Hollow
Section" but the 20mm diameter stuff (21.3mm) has 3mm wall thickness which seems a bit thick to me. Does that sound like the right stuff to use?
The only tube with a wall of 1.5mm is the ERW.
Regards,
Mark
[Edited on 20/10/04 by dern]
Cold Drawn Seamless
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Chris Green
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| posted on 22/10/04 at 03:31 PM |
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Where can I get 1.6mm thick 25mm box from?
My local fabricator can only get 2mm thick?
Cheers!
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Alan B
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| posted on 22/10/04 at 04:50 PM |
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What have learned....
Thro' 20 years of metal buying.....
ERW....is really a process name and as Pete says is used for most (all?) square/rectangular sections....however the term is also applied commonly to
sections of thinner wall thickness (e.g. in the case of 25 square less than 2mm)
RHS/box section....the term is usable for all sizes, but is commonly reserved for the thicker sections (e.g. for 25 square 2mm upwards)
CDS....usually for round tube
DOM.....as above, often considered as good as CDS (US racing bodies consider it equal for rollcages etc.)...some consider it better as the
concentricity is more accurate.
[Edited on 22/10/04 by Alan B]
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Chris Green
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| posted on 25/10/04 at 07:01 AM |
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quote:
Originally posted by Chris Green
Where can I get 1.6mm thick 25mm box from?
My local fabricator can only get 2mm thick?
Cheers!
Any ideas please? I've worked out that 2mm thick would weight 13kg's more than 1.6mm. I don't really want to use 2mm!
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JoelP
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| posted on 25/10/04 at 07:23 AM |
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i would just ring another stockholder. I cant believe that no one sells it.
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Peteff
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| posted on 25/10/04 at 08:25 AM |
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Chris, you want imperial tube.
You are asking for the metric equivalent of what you want and this will not be available. What you want is 1" 16 gauge tube.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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dern
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| posted on 25/10/04 at 08:38 AM |
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quote:
Originally posted by Chris Green
Where can I get 1.6mm thick 25mm box from?
My local fabricator can only get 2mm thick?
Parker's steel deliver... I didn't fancy bring home 6m lengths of steel on the roof
rack 
Mark
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Chris Green
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| posted on 25/10/04 at 08:50 AM |
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Cheers Mark,
However, Parkers only list a minimum thickness of 2mm for 25mm square section on their website?
Do they stock 16g as well?
Cheers,
Chris.
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James
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| posted on 25/10/04 at 09:15 AM |
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I'm pretty sure mine came from Parkers so they certainly used to!
James
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dern
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| posted on 25/10/04 at 09:17 AM |
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quote:
Originally posted by Chris Green
However, Parkers only list a minimum thickness of 2mm for 25mm square section on their website?
Do they stock 16g as well?
Go to the stock page (locate products/stock type), select 'Black Carbon Steels Tubes & Pipe', then
select ERW, then select 'square ERW tube' and you'll be able to find what you need.
All the best,
Mark
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Chris Green
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| posted on 25/10/04 at 10:45 AM |
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oh yes. I see.
I was looking in the "Black Carbon Steel Hollow section" section.
Cheers!
Chris.
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dern
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| posted on 25/10/04 at 11:06 AM |
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quote:
Originally posted by Chris Green
oh yes. I see.
I was looking in the "Black Carbon Steel Hollow section" section.
Cheers!
Chris.
No problem... did the same thing myself and got quite confused
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