Whether or not annealing is necessary to stabilize the dimensions of a part depends on the conditions under which it is to be used. Estimates based on after-shrinkage data(Fig. 3-15 and 3-16) will be helpful.
A high operation temperature requires a fairly high annealing temperature. For example, with very slight after-shrinkage, you may find that annealing at 175°C for 3 hours or at 190°C for one hour is necessary as seen in Figs. 3-21 and 3-22.