Cold Rolled Steel Sheets with Ultra High Lank ford Value and Excellent Press Formability

摘要

It is well known at the laboratory scale experiments that lubricated ferrite rolling in hot-rolling is effective in developing (111) texture. In order to apply this metallurgical principle to an industrial scale mill, Kawasaki Steel developed an endless hot-rolling process at Chiba Works, making it possible to employ heavily lubricated hot-rolling over the full length of hot bands with stable operation. With the application of hot band having (111) texture obtained in this manner, an extremely high Lank ford value (#gamma#-value) of 3.0 is achieved after cold-rolling and annealing. The newly developed steel sheet shows excellent drawability compared with that of conventional EDDQ steels. The new steel in expected to be applied mainly in automotive parts which are subjected to complex and heary press deformation.