help with titanium, please

hi, I saw someone else on here asked for help and got it, so I'm hoping
some
people are on here still that can help me, since the info on the
internet is
limited. I have sheet titanium with hit or miss markings on
it. it has heat-2955
(possibly cut off by the piece being cut),
MS-7-174, PE-A-TI-6AL (I know this is
partially the titanium alloy
designation/composition), 871, and LAI titanium.
please help, I'm trying
to figure out what I have here.
as far as physical
properties, it seems rather rigid and springy for
only being about .04" thick,
it's between 15 and 20 years old (possibly)
and has a gray color to it.