I believe warping is due to the speed of heating/cooling not necessarily the temperature.

So you have it room temperature, then put it in 375+ it warps.

Or its 375 and you put it under room temp water, also warps.

At least thats the advice i received about cleaning stainless steel pans after cooking. let them cool slowly, then wash them. 

 I hear them go “bang!” after I put them in the oven and then they’re bent diagonally 😂 I suppose it could be because of the temperature difference there, too. 

 🤣 😅 

So it seems uneven heat distribution is also a thing. 

https://www.americastestkitchen.com/cooksillustrated/articles/6782-how-to-fix-a-warped-baking-sheet