I work in a processing plant where round steel cutting blades are used, e.g. 1-2 mm thick and 15-30 cm in diameter. During normal plant operations, these blades are mounted on machinery and rotated at circa 1000 RPM -- thus they are perfectly flat whose outer edges are beveled inward.
I've noticed that often multiple blades tend to stick together, especially when they are wet (being washed and rinsed with water). Sometimes a generous force is needed to "pry" apart two (or more) blades stuck together.