Abstract
Casting by the billet continuous caster is useful to reduce cost from the viewpoint of energy saving and yielded ratio because there is no blooming process. As its mould size and reduction ratio of rolling are smaller than the bloom caster, however, lowering of oxygen content during secondary refining, prevention of re-oxidation during casting and improvement of surface quality of the cast billet are very important. To improve these technical problems, production technics of structural steel casting for automobile use by the billet caster were developed, and a quality equivalent to that of the cast bloom was obtained.
