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The No.3 slab caster,which mainly provides slabs to the 5 000 mm plate mill at Baosteel,was put into production in December,2004.The size of the biggest slab produced by this caster is 2 300 mm in width and 300 mm in thickness.The designed output of the caster is 2.3 Mt/a.Slab surface longitudinal crack defects,which were related to the heat flux of the mold,frequently occurred in the early stage of the startup of the caster.As mild cooling powder is beneficial to the uniformity of the shell of initial slabs,the concentration of stress is reduced,and the longitudinal cracking on the surface is avoided.This study evaluates the performance of several kinds of powder,and the results show that mold powder of high basicity,high crystallization proportion and low heat flux is to the benefit of the reduction of the longitudinal cracks on the surface and the defects of slabs.
The No.3 slab caster, which primarily provides slabs to the 5 000 mm plate mill at Baosteel, was put into production in December, 2004. The size of the biggest slab produced by this caster is 2 300 mm in width and 300 mm in thickness.The designed output of the caster is 2.3 Mt / a.Slab surface longitudinal crack defects, which were related to the heat flux of the mold, usually occurred in the early stage of the startup of the caster. to the uniformity of the shell of initial slabs, the concentration of stress is reduced, and the longitudinal cracking on the surface is avoided. This study evaluates the performance of several kinds of powder, and the results show that mold powder of high basicity, high crystallization proportion and low heat flux is to the benefit of the reduction of the longitudinal cracks on the surface and the defects of slabs.