Man, be more specific! If you are refering to titanium WHITE pigment than that is very cheap, it is used in housepaint and for artists. If you want titanium metal, i am curious as to what possible aplication you would want it for where aluminum would...
A Rockwell test will tell but if you try to file it and you can't or try grinding it and you get bright blue sparks off the parent metal its a good chance you have Titanium.
From what I've helped friends build, you can use a stand alone grill, but generally you get better results either with expanded metal in a frame over a stone/brick firebox, or using steel/stainless round stock welded into a frame over the same firebo...