Outer Limits 4x4 Board

tired of hopeless phone calls. help me
50mm od x 1.6 approx

cheers

bru

What are you using it for???

1.6 Wall is pretty thin!

There is a place on the north side i think it was called Gateway steel, we originlly got ours from there but i don't know if they still sell it!

There is a place on the south side but i don't know there name!

Metaland (Brendale) (07) 3889 7575

www.metaland.com.au

Very good service, good people.

using it for a exo cage, i will design it right so its light. maybe 2.4mm for main tubes. just ordered a speedwerx bender and saw, so need tube to start playing

cheers

bru

Only place I know where to get DOM tubing is from British International in Sydney.

To get seemless stuff in Brisbane somewhere like Bohler does have hydraulic feeder tube that is seemless and in the smaller sizes although this stuff is really only mild steel (maybe a little bit better) and not as good as the DOM from british international which is a 1020 steel (although DOM isnt seemless as most people believe)

If you want to make a cage out of something that light then you may as well use ERW tube (I think its ERW) which is basically exhaust tube. I think they make this stuff up to about 2.5mm thickness. ERW tube is a much better tube than the normal old nominal bore pipe. I believe that its only recently that CAMS regs went from using ERW to DOM. DOM is basically ERW tube thats been drawnin a second process.

Sam

can i ask a stupid question... what are all these abbreviations and what do they mean in the types of steel or tube?

DOM means Drawn Over Mandrel. I don't know what the others mean.

So Sam - Do you guys use DOM for your buggy's or something else (ERW???).

ISUZUROVER wrote:DOM means Drawn Over Mandrel. I don't know what the others mean.

So Sam - Do you guys use DOM for your buggy's or something else (ERW???).

Everything so far is just normal old mild steel pipe. The stuff with a welded seam.

Sam

was going to suggest that race tech steel tube sells dom but it turns out that its the same place strange rover mentioned british international trading,

Pity you're not in Melbourne, we're buying from British International all the time. 50K worth last year. We are one of their goooooooood customers.

farking hell this stuff is dear as poison.

50x1.6 $37.53 per mt
50x2.0 $45.01 per mt
38x1.6 $19.24 per mt

+gst +transport only 6 metre lengths too

when cheezy said it was dear i thought like maybe twice the price of erw

erw

50mmx1.6 $42 for a length inc gst (6.1mt) plus no delivery as i can get it 200m down the road.

cheers

bru

you won't be happy with 1.6mm wall, even if it is top spec moly tube, it will still dent and deform real easy. i used seamless schedule 40 (for the higher grade steel, not the seamlessness) which is a bout 3.6mm wall, and i have dented the wall of that in a few places already.

its for an exo cage, rear tray mudguards etc. inside and external cages, (sucks that i need one inside as well). i will use 3.2mm erw for the main hoops, rock sliders etc. 1.6 for all braces that are hidden from damage. i want so see how my new speedwerx bender shapes up before i go real heavy! also i have a pipe bender already and if if i wanted real thick heavy pipe i wouldn't have bought the tube bender.

trying to keep the weight low on my 2200kg truck

cheers

bru

bundyboy wrote:can i ask a stupid question... what are all these abbreviations and what do they mean in the types of steel or tube?

As stated DOM = Drawn Over Mandrel
but as not stated ERW = Electric Resistance Welded (I think)

Bru, what size die(s) did you buy? Isn't that really what's going to determine what you can and cant use (well, to a degree). You cant just use pipe on tube dies, and vice versa, coz the OD are slightly different.

Bru, what size die(s) did you buy? Isn't that really what's going to determine what you can and cant use (well, to a degree). You cant just use pipe on tube dies, and vice versa, coz the OD are slightly different.


bought 2" and 1 1/2" dies and cutters for my tube bender (but i have a pipe bender as well .

will be using erw tube of various thicknesses, and go to 2 roll hoops if need be.

cheers bru

DOM is a CDW or cold drawn welded

There is also CDS which is Cold Drawn Seamless

Generally CDS is more malleable then CDW as the forming process involved in CDW compresses the tube walls.

ERW is electric resistance welded

there is also Hollow Bar which is what most suspension linkages are made out of

if anybody is after any of these materials you can

email me at

F.A.T@bigpond.com

Stu

Fathillbilly wrote:DOM is a CDW or cold drawn welded

There is also CDS which is Cold Drawn Seamless

Generally CDS is more malleable then CDW as the forming process involved in CDW compresses the tube walls.

ERW is electric resistance welded

there is also Hollow Bar which is what most suspension linkages are made out of

if anybody is after any of these materials you can

email me at

F.A.T@bigpond.com

Stu

Stu, what is the difference between CDW and CDS? I ended up buying CDS for my suspension links.

Is CDS the sort of stuff they use for hydraulic rams???

CDS generally has lower strength/stress properties than CDW.

(UTS / TS ultimate tensile strength/stress or just Tensile Strength. there is also YS yeild strength/ stress)

UTS is how much force a material can handle before it fails.
YS is how force a material can handle before it starts to deflect / bend

which means 2 things it is easier to form and in most circumstances it will fail, bend, fracture easier / earlier.

for suspension linkages in high stress applications like our type of vehicles where a suspension linkage not only has to deal with the forces of locating the diff/axle housing it has to withstand impact from hitting rocks, logs etc. i would NOT recommend CDS. i would prefer an hollow bar as the wall thickness are much larger and shouldn’t dint making the linkage much weaker

an example
50.8mm CDS, WT 3.33mm UTS = 480Mpa and YS = 313Mpa
while
50.8mm CDW, WT 3.05mm UTS = 620Mpa and YS = 550Mpa

Stu

Saying that cold drawn seamless has lower strength than cold drawn welded needs to be qualified.

cold drawn seamless is available in many materials and grades ranging from carbon steel, carbon manganese, many types of stainless and many types of chrome moly. These are necessary to meet the many pressure, temperature and fluid applications for pressure piping.

Where I currently work (large proccess plant), they wont use welded pipe. Australian standard AS4041 does not permit welded pipe in many applications eg class 1 piping.

Bush65 wrote:Saying that cold drawn seamless has lower strength than cold drawn welded needs to be qualified.

cold drawn seamless is available in many materials and grades ranging from carbon steel, carbon manganese, many types of stainless and many types of chrome moly. These are necessary to meet the many pressure, temperature and fluid applications for pressure piping.

Where I currently work (large proccess plant), they wont use welded pipe. Australian standard AS4041 does not permit welded pipe in many applications eg class 1 piping.

quite true but i was just trying to keep it simple and the figures above are for mild steel.

Stu

the barrel of a hydraulic cylinder is made of hollow bar don't know the exact grade. where i work we machine them out to size then hone them.

and if a barrel is over 0.010" on nomonal size then it has to be scraped.

piston seals seem to bypass at 0.010".

but anyway. don't go anything with a welded seam, it wont bend as easy, and wont be as strong,

seamless works on that all the force is spread over the complete area.

where welded seams are more like runing to halves, will bust at the weld first.

customhilux wrote:don't go anything with a welded seam, it wont bend as easy, and wont be as strong,

AFAIK almost all motor racing regulations specify that roll cages be made from DOM - which has a welded seam.