Damon Hill
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| posted on 29/6/05 at 04:39 PM |
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Talking about corrosion - how come we don't stainless steel?
i guess this has been discussed before, but can't find any threads...
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andylancaster3000
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| posted on 29/6/05 at 04:45 PM |
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Very hard, so hard to work, heavy and not as easy to weld.
Andy
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Hellfire
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| posted on 29/6/05 at 04:49 PM |
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Very abrasive (to cut) and dense - it's also very expensive! That discounts it from the locost theme! 
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andyps
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| posted on 29/6/05 at 04:59 PM |
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At least one person on here is making / has made a stainless chassis. CAn't remember who though!
Andy
An expert is someone who knows more and more about less and less
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gazza285
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| posted on 29/6/05 at 05:07 PM |
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Also stainless is prone to stress fractures.
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907
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| posted on 29/6/05 at 05:13 PM |
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quote:
Originally posted by Hellfire
it's very expensive! That discounts it from the locost theme!
If you take the price of mild steel, add the cost of, say, shot blasting & powder coating,
it's like my front room.... not a lot in it.
My chassis, with a floor, and w/b tube cost me about £200
Anyway, I hate painting 
Paul G
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JohnN
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| posted on 29/6/05 at 05:30 PM |
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Previous thread for information...
Here
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jonbeedle
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| posted on 29/6/05 at 08:19 PM |
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907 (but he's a pro welder)!
quote:
Originally posted by andyps
At least one person on here is making / has made a stainless chassis. CAn't remember who though!
"Everyone is entitled to an opinion however stupid!"
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quattromike
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| posted on 30/6/05 at 06:47 AM |
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I've also started making my chasis in stainless 316 grade . I'm not following the book design because i wanted to make it bigger so most of
the strenghthening will be re-thought out anyway so i'm not all that worried about stress points yet. and i don't think it'll be
heavier that mild steel because of the extra strength of stainless you can afford to go a tad lighter with the sections and you don't have any
weight of the paint(or rust!) .
Mike.
 
Rescued attachment P1230021u.JPG
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Bluemoon
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| posted on 30/6/05 at 09:26 AM |
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Is'nt their a problem with electrochemical reactions of stainless steel and ali? This could cause the stainless to corrode, where pannels are
pop rivited on. With steel it's the other way round, the pop rivites rust rather better situation I would suggest??
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stevebubs
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| posted on 30/6/05 at 10:16 AM |
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How structurally sound is it when MIGing Stainless?
I've migged up some small stainless items to good effect...using stainless wire (of course)
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JonBowden
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| posted on 30/6/05 at 10:57 AM |
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Anyone thought of a stainless monocoque as Robin Hood use.
I think there would be less of a problem with fatigue than with a spaceframe.
Jon
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gazza285
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| posted on 30/6/05 at 10:59 AM |
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"Is'nt their a problem with electrochemical reactions of stainless steel and ali? "
Stainless and ally together is a bad idea, but it is the ally which corrodes, and at quite a rate too.
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quattromike
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| posted on 30/6/05 at 04:27 PM |
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I think as long as they are not in direct contact with each other it would be ok. I'm thinking of using gasket sealer or somthing to that
effect.
Mike
[Edited on 30/6/05 by quattromike]
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Bluemoon
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| posted on 1/7/05 at 11:21 AM |
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Bit tricky with Ali riviets? I guess you have to rely on keeping the water out rather than electrical insulation, e.g PU glue aound rivet holes before
putting pannel on...
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ned
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| posted on 1/7/05 at 11:29 AM |
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simple solution with a stainless chassis would be to use stainless panels and stainless rivets surely?
Ned.
beware, I've got yellow skin
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David Jenkins
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| posted on 1/7/05 at 11:32 AM |
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As formerly seen on the Isonblade - very striking to look at, too.
DJ
[Edited on 1/7/05 by David Jenkins]
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kreb
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| posted on 1/7/05 at 01:38 PM |
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quote:
Is'nt their a problem with electrochemical reactions of stainless steel and ali? "
Not to my knowledge. I do achitectural metalwork and we generally use SS as a safe go-between dissimilar metals. It does not seem to react to either
ferous or non-ferous metals.
Perhaps there's something in the UK air?
https://www.supercars.net/blog/wp-content/uploads/2016/04/1966_FiatAbarth_1000SP1.jpg
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David Jenkins
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| posted on 1/7/05 at 01:53 PM |
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quote:
Originally posted by kreb
Perhaps there's something in the UK air?
A lot of water, usually! 
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gazza285
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| posted on 1/7/05 at 02:05 PM |
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I work with achitectural and structural steel as well as foodstuff conveyors and stainless. We have always isolated stainless from both ferrous and
non ferrous metals, including galvanised steelwork using polyeurethane washers and top hats in bolt holes and landing pads for mountings.
Galvanic reaction between stainless and alluminium/steel is very well documented in print as well as the web. Kreb, I hope I never have to walk under
any of your work on a windy day.
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quattromike
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| posted on 2/7/05 at 01:04 AM |
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I think it's more of a problem between ali and mild steel than ali and stainless i've never heard of it being a major issue.
Is electrochemical only happen when surrounded by flowing water or somthing to that effect ? Thats why we fit alloy anodes to all steel frames for sub
sea use, it eats the alloy first to prolong the life of the steel.
Mike
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907
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| posted on 2/7/05 at 07:40 AM |
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Hi All.
As I see it, the main problems with building in stainless are twofold.
Firstly the welding. It really has to be Tig, and welds really need to be backed with argon.
All the tee joints on my chassis have a 3 mm hole which allowed the argon to flow through while
it was being welded.
Tig welders, and a plentiful suply of gas doesn't come cheap.
Secondly, a chassis is not just 8 (ish) lengths of box section.
It's all the other bits that for most people would be a problem.
Small quanties of all sorts of round bar and plate are needed, seat belt mounts,
suspension brackets, rack mounts, fuel tank, steering column, the list is endless,
all need to be stainless as well.
I'm lucky, I work with this sort of stuff all the time. I can wander up to the gilly in
my lunch break and just chop a bit off.
Hand making every bit does mean it's a long build, four years so far,
but it will be finished one day, I hope.
Nice to see there's three of us now, or is there more?
ATB
Paul G
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rocket
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| posted on 4/7/05 at 09:29 PM |
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very bad idea
Not 316!!!!! stress cracks!!!!
Stainless is 1.5 times heavier you you need to use 22 gauge!
Rgds
Rogerquote:
Originally posted by quattromike
I've also started making my chasis in stainless 316 grade . I'm not following the book design because i wanted to make it bigger so most
of the strenghthening will be re-thought out anyway so i'm not all that worried about stress points yet. and i don't think it'll be
heavier that mild steel because of the extra strength of stainless you can afford to go a tad lighter with the sections and you don't have any
weight of the paint(or rust!) .
Mike.
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rocket
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| posted on 4/7/05 at 09:38 PM |
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Stainless welding
It doesn't need backing up with argon unless you are planning to use it in a food factory or having a weld test. but make sure you clean all
the welds after or it will rust. Stainless MIG no good on thin sheet TIG weld best.
Rgds
Roger
quote:
Originally posted by 907
Hi All.
As I see it, the main problems with building in stainless are twofold.
Firstly the welding. It really has to be Tig, and welds really need to be backed with argon.
All the tee joints on my chassis have a 3 mm hole which allowed the argon to flow through while
it was being welded.
Tig welders, and a plentiful suply of gas doesn't come cheap.
Secondly, a chassis is not just 8 (ish) lengths of box section.
It's all the other bits that for most people would be a problem.
Small quanties of all sorts of round bar and plate are needed, seat belt mounts,
suspension brackets, rack mounts, fuel tank, steering column, the list is endless,
all need to be stainless as well.
I'm lucky, I work with this sort of stuff all the time. I can wander up to the gilly in
my lunch break and just chop a bit off.
Hand making every bit does mean it's a long build, four years so far,
but it will be finished one day, I hope.
Nice to see there's three of us now, or is there more?
ATB
Paul G
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NS Dev
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| posted on 6/7/05 at 07:37 AM |
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quote:
Originally posted by 907
Hi All.
As I see it, the main problems with building in stainless are twofold.
Firstly the welding. It really has to be Tig, and welds really need to be backed with argon.
All the tee joints on my chassis have a 3 mm hole which allowed the argon to flow through while
it was being welded.
Tig welders, and a plentiful suply of gas doesn't come cheap.
Secondly, a chassis is not just 8 (ish) lengths of box section.
It's all the other bits that for most people would be a problem.
Small quanties of all sorts of round bar and plate are needed, seat belt mounts,
suspension brackets, rack mounts, fuel tank, steering column, the list is endless,
all need to be stainless as well.
I'm lucky, I work with this sort of stuff all the time. I can wander up to the gilly in
my lunch break and just chop a bit off.
Hand making every bit does mean it's a long build, four years so far,
but it will be finished one day, I hope.
Nice to see there's three of us now, or is there more?
ATB
Paul G
Having seen 907's pics and various handiwork, I for one would love to see the finished car, as it will be a masterpiece!!
It does amuse me that stress cracking problems are mentioned in 316 stainless, but people have no qualms about using the cheapest mild steel erw that
they can find, without thinking about the weld quality along the tube seams!!!! (which can be VERY poor!)
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