AMS stands for Aeospace Material Specification. They are published and maintained by SAE. http://www.sae.org/servlets/index you can get to the ASM specs by followin the links on their homepage.
I'm guessing you understand that the specification is included in the mill marks inked onto your...
The standard is ASTM B600 "Standard Guide for Descaling and Cleaning Titanium and Titanium Alloy Surfaces E1-1997 R(1997)" it should give you all you need to know. ASTM's web site is http://www.astm.org/