To provide an ingot manufactured by continuous casting and steel using it wherein the ingot is formed into a fine and uniform solidification structure, defects in the surface and internal part such as cracks, recessed flaws, wrinkly flaws and segregation are controlled, processability such as rolling is high and defects generating in the steel are reduced.
Processing such as rolling is applied after heating ingots manufactured by continuous casting which is characterized by being an equiaxed crystal wherein 60% or more of the whole cross section of the cast ingot satisfies the formula D<1.2X1/3+0.75. Here, D expresses the diameter (mm) of the equiaxed crystal as the structure whose crystal orientation is the same, and X expresses the distance (mm) from the surface of the ingot.
SEZE AKIFUMI
MIURA RYUSUKE
KUSUNOKI SHINTARO
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