This is the place where the majority of the warbird (aircraft that have survived military service) discussions will take place. Specialized forums may be added in the new future
Fri Jan 22, 2016 5:17 pm
Does anyone know the modern equivalent to the 1940s specification AN-QQ-S-684 and the conditions in which it may be available?
Many thanks
Sat Jan 23, 2016 12:27 am
That is 4130. Most often available in the normalized condition, I have also seen it available annealed.
Sat Jan 23, 2016 11:37 pm
4130M is a better grade, with more chromium and some nickel added.
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