METHOD OF ROLL REDUCTION FOR CONTINUOUS CASTING

• Main Authors: KAJITANI TOSHIYUKI, IZAWA KENICHIRO, MURAKAMI TOSHIHIKO
• Format: Patent
• Language: English; Japanese
• Published: 16.01.2020
• Subjects: CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING

To provide a method of roll reduction for continuous casting allowing for drastically decreasing the center segregation of a slab in continuous casting.SOLUTION: A method of roll reduction of a slab in continuous casting includes performing roll reduction of a slab by arranging reduction roll pairs 1 having a diameter of 350 mm or greater successively two pairs or more in a high solidus rate region 31 from a center solidus rate of 0.8 to a solidification completion, with a roll-reduction gradient due to each reduction roll pair 1 taken 5.5 mm/min or greater. Preferably, the reduction roll pairs 1 are arranged successively 3 pairs or more. Further preferably, in a low solidus rate region having a center solidus rate of from 0.3 to 0.75, roll reduction with a roll-reduction gradient of 0.8-1.2 mm/min is performed. This can drastically decrease the center segregation of the slab.SELECTED DRAWING: Figure 3 【課題】連続鋳造において、鋳片の中心偏析を抜本的に低減することのできる、連続鋳造の圧下方法を提供する。【解決手段】連続鋳造中において鋳片を圧下する方法であって、中心固相率が０．８から凝固完了までの高固相率領域３１において、直径が３５０ｍｍ以上の圧下ロール対１を連続で２対以上配置して鋳片の圧下を行い、各圧下ロール対１による圧下勾配を５．５ｍｍ／ｍｉｎ以上とする。好ましくは圧下ロール対１を連続で３対以上配置する。さらに好ましくは、中心固相率が０．３から０．７５までの低固相率領域において、圧下勾配が０．８〜１．２ｍｍ／ｍｉｎの圧下を行う。これにより、鋳片の中心偏析を抜本的に低減することができる。【選択図】図３