One solution is to normalize your own sheet - apparently it IS
possible to get tempered 4130.

But I've been wondering if the solution isn't High Strength Low Alloy
(HSLA) steels. I know nothing about their weldability compared to
4130, but I do know that tons and tons of the stuff are used in cars
and industrial equipment.

That's where I think homebuilding and experimental aviation as a whole
needs to start looking.

But no matter the reason - there is no 4130N available - and IMHO
there probably won't be for maybe several years.

So it looks like we need to find a substitute. I've been doing some
looking for the last couple of months but I'm no metallurgist and most
of my time has been spent educating myself in the ways of steel. So
far my local steel store has not been able to get anything I have come
up with unless I want to buy a whole truck load. I don't/can't.

Anyone have some opinions on a suitable substitute?
=================
Leon McAtee