CASTING METHOD OF STEEL IN TWIN BELT CASTER

摘要

PURPOSE:To produce a non-defective billet having no rippled surface and crack flaw in casting of a steel by a twin belt caster by controlling automatically the ratio between a caster belt speed and billet drawing speed according to the fluctuation of the billet drawing speed during casting. CONSTITUTION:A poured steel is cooled and solidified in the space L1 between the belts 4 of the caster 3, is cooled in the section L2 of transfer rolls for cooling and is drawn by pinch rolls 2. The ratio between the speed Vc of the caster belts 4 and the billet drawing speed Vp is determined from the rotating speed of a motor M by an operator 6 to the optimum set value of >=1 which is determined by experiment and for which a surface temp. 5 is taken into account. The non-defective billet is thus cast without the generation of a wrinkle and recess owing to compression on the surface of the billet and without the generation of the surface crack flaw owing to tension.