| 摘要 |
PURPOSE:To prevent cracking, to shorten the time for holding and to economize energy by executing holding for the specific time in a specific temp. region in a cooling process from a melt and starting rolling at the Ar3 point or above. CONSTITUTION:A continuously cast ingot is held for 2-10min in a 1,050-950 deg.C temp. region in the cooling process in succession to the solidification of the melt after casting in the case of subjecting the ingot to direct feed rolling or direct rolling. The rolling is started at the Ar3 point or above. The generation of cracking during hot rolling is thereby prevented, by which the energy is additionally economized and the installation is simplified.
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