I did find one stainless steel roll bar (cage), a non-911 application though.
Is 304 grade stainless steel more brittle than molybdenum steel?
Is molybdenum steel more brittle than mild steel?
And where does aluminum fit into the spectrum?
TigerCage – Bolt-In Roll Cage System
TigerCage – Bolt-In Roll Cage System « Ridetech News and Information
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The cage is constructed entirely from 304 grade stainless steel and requires absolutely no welding or fabricating.
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Some sort of hierarchical rating system or chart of metals and their strength and other characteristics such as energy absorbing bending would be useful in any meaningful discussion.
I am by no means qualified to create such a chart, but if I find one I'll post it.
Is the statement below true?
Hypothetically...Aluminum Roll cage
http://www.jeepforum.com/forum/f12/hypothetically-aluminum-roll-cage-955970/
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Aluminum will self harden over time
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Post #17 is very interesting:
http://www.jeepforum.com/forum/f12/hypothetically-aluminum-roll-cage-955970/index2.html
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..........if you stay below the endurance limit everything is fine.
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Good discussion on topic over at Rennlist back in 2004
http://forums.rennlist.com/rennforums/964-forum/111229-heigo-rollbar-aluminum-or-steel.html