REVAMPING OF THE NO. 2-3 SLAB CASTER AT POSCO GWANGYANG: DESIGN, START-UP AND INITIAL OPERATION RESULTS

  • S.m. Lee
  • J.Y. Hwang
  • S.H. Lee
  • G. Shin

Abstract

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

Published
2009-01-25
Section
Memorie