In the early 1990’s, US Secretary of Defense, William J. Perry, was at the forefront of military specification reform. Perry encouraged the military to use Non-Government Standards and do away with outdated military specifications, asserting that doing so would reduce government oversight and lower costs.
This reform had a significant effect on one of the most common specifications used in titanium procurement: MIL-T-9047. This specification covers aircraft quality, commercially pure and alloyed titanium rolled/forged bar, and reforging stock products.
In February 2005, MIL-T-9047G Amendment 2 was cancelled, and superseded by SAE (Society of Automotive Engineers) AMS-T-9047. AMS-T-9047 was a word-for-word translation of MIL-T-9047G AM.2, with minor editorial and format changes. AMS-T-9047 covered 16 grades of titanium, and multiple conditions, like its predecessor MIL-T-9047 did. SAE noted that the specification was too complex and would be better utilized if each spec and condition was broken out into its own AMS spec. In May 2006, AMS-T-9047A was cancelled and superseded by various specifications.
Many contracts still call out MIL-T-9047 and AMS-T-9047, and they continue to be certified by manufacturers. If your contract requires use of the superseding specification, refer to the table below pointing to the Superseding Specifications for several material designations within AMS-T-9047.
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