Abstract
In the Large Shape Mill at Kashima Steel Works, new rolling methods are developed and all universal beams (max;H900×300mm) are produced from continous casting slabs with 300mm in thickness.
(1) Slab edging methord
The characteristics of this rolling method consists of a strong edging reduction of slabs to make a dog-bone shape and a following forming reduction to make a beam blank through the forming groove and sizing groove in the break-down mill. By this method, large universal beams (max;H700×300mm, H400×400mm) are produced directly from continous casting slabs by hot-charge.
(2) Universal blanking method
Beam blanks for H900×300mm and H800×300mm are rolled previously from continous casting slabs by a universal mill. In this methods, the flange thickness of the workpiece is reduced highly and the flange width spreads much larger than the original slab thickness. The resultant beam blanks are rolled to universal beams after reheating.
