Metallurgical aspects
Bake hardening - (Hardening after baking)

The search for a certain BH hardening value that reduces or eliminates the risk of bearing return depends above all on the free carbon content (cf. figure 9), determined by the annealing heat cycle, but the choice of a particular heat cycle is not independent of the sheet quality targeted, as a number of properties need to be guaranteed at the same time, in particular the drawing parameters r and n (see article on the suitability of thin sheet for drawing [M 695] in the same treatise), but also a certain suitability for coatings.

• As a result, starting with continuously annealed aluminum...