By the introduction of TOOLOX®, SSAB in Oxelösund has turned into a new market segment, including heavier sizes and dramatically increased requirements on inner quality of the plate. To be able to determine the minimum reduction from slab to finished plate with acceptable inner quality, a study was made, to evaluate the minimum reduction for a given requirement of inner quality. By experimental rolling in the heavy plate mill in Oxelösund it has been proven that more than 40 % total reduction is necessary for total closure of voids under the geometrical deformation conditions in that mill. The total reduction is more important than the geometrical rolling conditions, and heavy pass reductions are favourable for void closure. The closure of internal defects can be improved by cooling the surface of the slabs.
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