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Classic Wings Magazine WWII Naval Aviation Research Pacific Luftwaffe Resource Center
When Hollywood Ruled The Skies - Volumes 1 through 4 by Bruce Oriss


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Yak3
 Post subject: AN-QQ-S-684 Steel
PostPosted: Fri Jan 22, 2016 5:17 pm 
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Joined: Sat Aug 15, 2009 3:23 am
Posts: 191
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
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EW439
 Post subject: Re: AN-QQ-S-684 Steel
PostPosted: Sat Jan 23, 2016 12:27 am 
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Joined: Sat Sep 04, 2010 1:19 pm
Posts: 50
That is 4130. Most often available in the normalized condition, I have also seen it available annealed.
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exhaustgases
 Post subject: Re: AN-QQ-S-684 Steel
PostPosted: Sat Jan 23, 2016 11:37 pm 
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Joined: Wed Jul 06, 2011 6:26 pm
Posts: 239
4130M is a better grade, with more chromium and some nickel added.
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