クラッド鋼板の先後端部変形におよぼす圧延条件の影響

抄録

In a study of the deformation behavior of stainless clad steel resulting from the difference in flow stress between hot stainless steel and mild steel at the leading and tail ends, the effects of various rolling conditions on the alteration of mild-steel protrusion were evaluated by experimental hot rolling and two-dimensional FEM analysis. The experimental and analytical results showed that the mild-steel protrusion at the tail end is reduced when using rolls with different diameters and lubricated rolling in comparison with rolling under conditions of equivalent roll diameters, equivalent roll velocities, and non lubricated rolling, because the former conditions promote uniform deformation of the mild-steel protrusion at the tail end. On the other hand, the mild-steel protrusion is facilitated by rolling at different velocities, as this enhances shear deformation in the roll bite. The inlet angle of the clad steel on the entrance side of a roll bite materially affects the mild-steel protrusion. As the inlet angle increases, the mild-steel protrusion at the tail end undergoes a large deformation owing to the insertion of the clad steel into the roll bite at an inclined angle. Furthermore, under the condition of constraint of the clad steel at the roll bite entrance (roll bite angle=0°), the use of different roll diameters and lubricated rolling has a large effect in suppressing mild-steel protrusion.