DIRECT HOT ROLLING METHOD BY NONNHEATED BLOOMED MATERIAL OF HOT STEEL INGOT

摘要

PURPOSE:To make effective use of the heat quantity retained by hot steel ingot and achieve saving of energy of soaking process by loading the hot ingots of rimmed steel or semi-killed steel in a heat insulating furnace which does not accompany heating to let them soak down to the temperature suited for blooming and subjecting them directly to hot rolling without heating. CONSTITUTION:The hot ingots of rimmed steel or semi-killed steel after draw spike are loaded into a heat insulating furnace or a heat insulating box whose track time is set at solidifying rates 50-80% and which does not accompany heating to maintain the quantity of heat retained in the hot steel ingots and soak the ingots by the recuperation action of the hot steel ingots themselves. When the solidifying rate becomes 90% or over, the hot steel ingots are drawn out from the heat insulating furnace or heat insulating box and are conveyed to the blooming process. After blooming, they are directly hot rolled in succession without heating.