| 摘要 |
PROBLEM TO BE SOLVED: To obtain superior etching properties by blooming mainly through plastic elongation deformation steel ingot by ingot making method or slab by continuous casting process in its main primary dendrite direction and further by hot rolling and cold rolling in the same deformation direction. SOLUTION: The main primary dendrite means the primary dendrite in the division of the largest volume when steel ingot or slab interior as solidified is divided in areas whose primary dendrite direction is same or almost same as each other. With a rectangular parallelopiped steel ingot, the dendrite with both sides to form thickness as the starting point is the main dendrite, and the thickness direction or similar direction is the direction of the primary dendrite. It is ideal to equalize the primary dendrite direction and plastic elongation deformation direction, but accurate identification is not always necessary. It is preferably 25 deg. or less, more preferably 18 deg. or less, and most preferably 10 deg. or less.
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