Looking for the steel for my roll cage and suspension arms

The spec is : cold drawn seamless BS6323 CFS3, with choices of "as drawn" (yield 360n/mm2, tensile 450), annealed (170 yield, 340 tensile) and normalised (215 yield,360 tensile).

I was thinking of using 50.8*2.03 for the roll cage - I think that fits the roll bar spec.

Which do I want?
(the full details can be seen at www.caparo.com/_assets/6690.pdf)


Thanks for any help
Hugh

If you need the tube bending and you are having that done by a tube manipulation company I would contact them and ask what they normally use.
On the face of it the as drawn condition is the strongest and probably cheapest, if it does not have any post drawing heat treatment. Check also for any differences in weldability between the 3
supply conditions.

Mal

Normalising should make it easier to work it you are bending it yourself.

yep, you want normalised.

Annealed is too soft on the "unbent" bits and as drawn will crack on tight bends.

ps yep "imperial-metric" 50mm x 2mm tube will be fine by the blue book.

Ps ps I have built a few cages

ps ps ps.........

the bending process will work harden the bends to a higher tensile anyway

Thanks for the info - I'll order the normalised stuff.