One of the purposes of revamping the No. 2-3 caster was to have annual production capacity of 3.5 milliontonnes per year for automotive application. Under a given caster length of 47m, the basic requirement underthis value is to achieve 2.7 m/min casting speed for 250mm x 1600mm in slab section. In order to ensurestable operation for this high casting speed, many technologies were newly developed and implementedduring the revamping process. The roller geometry was designed to minimize mould level huntingdue to unsteady bulging. The concept of Intensive secondary cooling was applied to shorten crater endposition as well as to decrease corner transverse cracking by applying the concepts of surface structurecontrol [1]. A movable multi-mode electromagnetic system was designed to control mould flow tomeet diverse operation conditions. An Automatic Ar control system was applied at the caster nozzleto minimize nozzle clogging. This caster was started in Nov. 2007 and went up to 2.7m/min incasting speed very quickly. This paper discusses the behaviour of mould level, mould surface flow andsecondary cooling temperature to the directions of slab width and thickness experienced during casting speedincrease and in particular at 2.7m/min maximum casting speed. Initial productivity and slab-quality resultsare also presented
