双ロール法におけるロールクラック防止の技術

概要

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Thin strip casting of 4.5wt% silicon steel has been carried out with a twin roll caster with cooling rolls 550 mm in diameter and 500 mm in width. The casting speed was of the order of 2.1-5 m/sec and the thickness of the strip varied from 0.2 to 0.5 mm. One of the significant technologies for the casting of tonnage strip is the design of the long-lived cooling rolls. Micro-cracks occured around the roll surface when casting heats of more than one ton. In these experiments, the roll remperatures of the inner and outer surfaces were measured during casting and thermal cycle of roll temperature was calculated from the measured values. Roll deformation behavior and working stress were analyzed by the two dimensional finite element method. Based on these theoretical calculations, this paper reports on (1) surface coating by Ni-Cr plating on the rolls, (2) design for an increased cooling water circulation rate in the rolls, and (3) application of a Cu alloy sleeve having excellent high-temperature strength. By adopting these improvements, the authors succeeded in producing a thin strip on a 3 ton/heat scale by twin roll casting.
社団法人日本鉄鋼協会の論文
1996-04-01