I’d like some help with a project. I’m designing a stainless steel 304 enclosure with multiple 90° flanges (sheet thickness ~2 mm). For strength and edge alignment, I want the inside bend radius to be as tight as possible, but also to avoid cracking or increased cost.

What minimum inside radius would others recommend for 2 mm SS-304 in 90° bends for an enclosure that sees occasional vibration? Also, how does choosing air bending vs bottom bending affect fatigue life or cost in this scenario?