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SAE AMS5559 Revision J, November 1, 2002
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Steel, Corrosion and Heat-Resistant, Welded Tubing 18Cr - 10.5Ni - 0.40Ti (SAE 30321) Thin Wall Solution Heat Treated
Includes all amendments and changes through Reaffirmation Notice , October 2012
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AIA/NAS Aerospace Standards

This specification covers a corrosion and heat-resistant steel in the form of welded tubing.


This tubing has been used typically for high pressure air ducting requiring both corrosion and heat resistance, especially when such ducting is welded during fabrication, and when the wall thickness is approximately 1% of the OD or less, but usage is not limited to such applications.