Hot rolling and hot-band annealing conditions seem to be very important factors to produce the final sheet having a better deep drawability and fewer surface defects for Ti stabilized 17Cr stainless steel.
Two kinds of experiments were performed to investigate
(1) the effect of finishing temperature with and without hot-band annealing on the plastic strain ratio (r value) of the final sheet,
(2) the effect of finishing temperature and hot-band annealing condition on the ridging tendency of final sheet, and obtained the following results.
Excellent r values are obtainable by decreasing the finishing temperature without hot-band annealing. But pronounced ridging is formed by omitting the hot-band annealing.
Ridging can be diminished by eliminating the band structure which is formed in the center layer of the hot rolled sheet, and the elimination can be attained with a combination of low finishing temperature and propriate hot-band annealing temperature.
The lower finishing temperature is favorable as it facilitates the recrystallization of the band structure with a lower annealing temperature.
The hot-band annealing temperature must be high enough to complete the recrystallization of the band structure, but not be so high as the grain coarsens to become an origin of the orange peel.
The appropriate annealing temperature depends on hot rolling condition and Ti contents.
