連鋳々片の凝固組織と非金属介在物の挙動について

抄録

In the slabs of Al-Si killed steel cast continuously by the vertical-type caster, some Al₂O₃ clusters accumulate below the slab surface. By investigation on the macro-and micro-structures of slabs, it was clarified that the Al₂O₃ clusters were entrapped when the columnar dendrite grew discontinuously.
This discontinuity has been improved by the control of the casting temperature. Then, the defect originated from the non-metallic inclusions at welds of ERW pipe, especially that with large thickness and small diameter, has been reduced.