The texture of an extra low-carbon and high strength bake-hardening sheet steel (i.e. ELC-BH sheet)
processed in our laboratory through a new invented technology has been investigated by means of
ODF method, so that the cause of the very high r¯-value of this sheet has been discovered. Experimental results are shown as follows: ① The r¯-value of the experimental sheet treated by the new process is as high as 2.67 and this is the highest r¯-value published so far for phosphorus – added high strength and deep drawing sheet steels. At the same time, the contradiction between deep-drawability and
strengthening is successfully solved too. ② A nucleus of the new technology is supplying a good cold rolled parent state which benefits to the development of {111} annealing textures through controlling texture, while strong development of {111} annealing textures can cause very high r¯-value. ③ The cold rolling and annealing texture obtained by the new technology are quite different as compared with that of conventional process. New cold rolling texture has stronger {111} components and weaker {100} components than conventiopnal cold rolling texture. The concentrations of {111} components of new annealing texture are not only distinctly general increase but also the crystal orientations corresponding to the peak values of orientation concentrations of the texture have been also changed from conventional (1¯11)[11¯2] orientations to (1¯11)[01¯1] orientations.
