Improvement of Seam-defects on Strip Edge of Stainless Steel

Abstract

On the hot strip rolling, a sizing press is installed to change slab-width in stead of the vertical edgier mill. Operation of the sizing press has enabled the number of mold width changes to minimized. This has resulted in the potential monthly throughput of the caster increasing. Moreover, especially for stainless steel grades, the side seam defect can be much reduced by applying the convex die and thus trimming loss is much improved.
On the hot strip rolling of stainless steel grades, the side seam-defects tend to grow at the slab corner because of the temperature fall. Thus the new technique reducing the width of the side seam-defect by forming the slab edge into concave shape with the sizing press before rolling and preventing the sidthspread on rolling were investigated. The slab deformation in sizing with convex dies was analyzed by FEM simulation and the most suitable profile of the die was decided for the improvement of trimming loss because of the side seam defect.
In this report, above simulation results of slab-deformation by sizing press are presented.