even if reused. Get your pans in NPGS per "OU", No tevilah.The OU's position is that Aluminum Disposable pans do not need tevilla
The OU does not certify pans for Pesach but recognizes that they may be used without special certification so long as the pans are dry. we are not concerned that the pans might have been stamped out using kitniyos oils. (I believe the most common oil is actually peanut oil (see teshuvas Igeros Moshe).
Because the pans are dry and the issue is at most an aino ben yomo bliya.