PURPOSE: To enable high velocity casting of different steel kinds with the same single mold by constituting a continuous mold for continuous casting, in which a cooling water passage is built, with upper part of the mold for forming intense heat absorbing zone and middle and lower parts of the mold for forming slow heat absorbing zone.
CONSTITUTION: Molten steel 4 in a tundish 2 is poured into a mold 8 composed of a copper plate 8A, in which the detour cooling water passage 10 is built, through a dipped nozzle 6 to continuously cast a steel slab 14. Then, the mold 18 (8) is constituted of the upper part 18-1 of mold for forming the intense heat absorbing zone with the cooling water passage 10 approached to the inner wall of mold and the middle and lower parts 18-2 of mold for forming the slow heat absorbing zone with the cooling water passage 10 formed apart from the inner wall of mold. Then, the inner wall thickness of cooling water passage 10 at the intense heat absorbing zone is made to 15-20mm, and the inner wall thickness of cooling water passage 10 at the slow heat absorbing zone is made to 30-35mm, and at the time of casting low carbon steel having <0.08wt.% C content, the molten steel surface level is controlled at the intense heat absorbing zone and at the time of casting medium carbon steel having 0.08-0.14wt.% C content, the molten steel surface level is controlled at the slow heat absorbing zone. By this method, the intense cooling and slow cooling to the molten steel 4 are executed with the same single mold 18.
YUHARA SUSUMU
UMADA HAJIME
| JPS61195742A | 1986-08-30 | |||
| JPS62183938A | 1987-08-12 |