In Ron Webb wrote:

Lessee...20 pounds heavier, but not as brittle or corrosive...cheaper
to acquire, and easier to work with...

There is no difference between mild steel and 4130 as far as corrosion
resistance is concerned, and in a traditional welded tube aircraft
structure any increase in brittleness is going to be a non-issue. If
you hit something hard enough to break (not just bend) it, you probably
wouldn't have survived anyway. I've flown in an aircraft with a 4130
tube fuselage that was rebuilt following a stall/incipient spin incident
from (very) low altitude. Some tubes were bent but as I recall nothing
actually separated. Pilot and passenger both walked away.

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Del Rawlins-
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