MANUFACTURE OF STEEL PLATE WITH EXCELLENT END PART QUALITY

摘要

PURPOSE:To improve the product yield and quality by performing an edging before and behind the horizontal pass that the end face shape varies from a double bulging to single bulging in the finishing roll of the blank stock to be rolled. CONSTITUTION:The horizontal finishing rolling of a thick plate rolling reaches to the C step causing the spreading of a width via B step forming a bulging part at one spot of the center part and A step forming it at the upper and lower two spots. In this case, an edging is performed just before transferring with variation to the B step of a single bulging from the A step of double bulging in its end face shape of the blank to be rolled, and the double bulging is virtually corrected in a flat shape. In this way the seam flaw caused at the transfer time from A step to B step can be prevented. The yield and quality of the product is therefore improved.