Engineering Data
Quick Notes for B-21 Raider by Northrop Grumman 85% of work will come from these tier 1 suppliers: Pratt & Whitney: A Raytheon company that builds the F135 Engine, is also used for the F-35 Lightning. BAE Systems: Involved in several major defense projects, including the Lockheed Martin F-35 Lightning II, the Eurofighter Typhoon,…
Nitronic 40 Stainless Steel is a nitrogen strengthened austenitic stainless steel with great versatility, combining high yield strength with good corrosion resistance. AMS 5656, ASTM A276, ASTM A479/A479M, ASTM A484/484M are the applicable specs. There are two different version of Nitronic 40: UNS S21904 (XM11) and UNS S21900 (XM10). The difference between the two UNS…
Stainless is protected primarily by chromium oxide, a transparent oxide film that prevents further reaction with oxygen like rust. When machining stainless, if an iron particle gets embedded, the stainless now has a place where there is no oxide film for protection and corrosion starts. It is common that when machining fasteners they are cleaned…
