On the Operations of Circular Arc Type Bloom Continuous Casting and Product Qualities

Abstract

The No.2 continuous casting machine of NSC Muroran Works is 4 strands circular arc type, which is made by Hitachi Co. and started its operation in Oct 1971.
This machine is so designed as to cast bloom from 244×300 to 165×165 mm, beingsupplied the molten steel from 120 tons BOFs.
The bloom is subsequently rolled to bars, wire rods, bar in coils and shapes.
In this paper, the following items are described.
(1) The systems, adopted in this machine for mold quick changing, computerizationand labour saving.
(2) High productive operation by sizes quick changing method, series casting and high speed casting.
(3) Effective technics on decrease of non-metallic inclusion (Al-Si killed steel)
(4) Improvable methods on internal cracks, central segregation and segregation pattern observed on macro-structure.
(5) Mechanical and fatigue properties, hardinability and sand mark of rolling products.