COOLING DRUM FOR THIN SLAB CONTINUOUS CASTING, PROCESSING METHOD AND APPARATUS THEREOF, AND THIN SLAB AND CONTINUOUS CASTING METHOD THEREOF

摘要

Dimples, preferably 40 to 200 µm in average depthand 0.5 to 3 mm in diameter of circle equivalent, areformed on the peripheral surface of a cooling drum,adjacent to each other at the rims of the dimples; andfine humps (preferably, fine humps 1 to 50 µm in heightand 5 to 200 µm in diameter of circle equivalent on thesurfaces of the dimples and/or fine humps 1 to 50 µm inheight and 30 to 200 µm in diameter of circle equivalentat the rims of the dimples), fine holes (preferably, fineholes 5 µm or more in depth and 10 to 200 µm in diameterof circle equivalent), or fine unevenness (preferably,fine unevenness 1 to 50 µm in average depth and 10 to 200µm in diameter of circle equivalent) are formed at therims and/or on the indented surfaces of said dimples.