Q. Do Teflon coated metal pots and pans require tevila?

A. Many Poskim maintain that they require tevila without a brocho. (StarK Kashrus Kurrents v.37: 3, OU Tevilat Keilim- A Primer, Guide To Tevilas Keilim by Rabbi B. Forst reviewed by HoRav Belsky, et. al.).
Tevilas Keilim (11: n. 6), quotes Horav S. Z. Auerbach zt”l that it depends if the coating is similar to a paint veneer it requires tevila with a brocho, in doubt without.
Horav Shlomo Miller’s Shlit’a opinion is similar, and it depends on the thickness of the coat. Therefore, it is better to recite a brocho on another utensil.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a