ESTUDO FENOMENOLÓGICO DO MECANISMO DE OBSTRUÇÃO DO FLUXO DE AÇO DO DISTRIBUIDOR PARA O MOLDE NO INÍCIO DO LINGOTAMENTO CONTÍNUO DE PLACAS

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The foccus of this work is the phenomenon known as start freezing blockage of the first batch of liquid steel flowing from tundish to mold through the slide gate system of a continuous casting machine. The flow rate is set by adjusting the position of the refractory sliding gate but in some instances, due to factors such as liquid steel temperature, refractory pouring channel temperature, slide gate opening and others, a premature and quick freezing of steel is observed. That leads to loss of productivity and other operational problems. There is little study on this phenomenon some consider this is inherent in the nature of process. In order to improve understanding of this problem the following approach was taken: - Reporting of the operational conditions during heats when starting freezing was observed; characterization of the frozen logs - Thermo-fluidynamic numerical modeling of the pouring channel system for a variety of steel grades and pre-heating conditions; comparison with plant data - Temperature measurements through thermocouples embedded in the slide gate system and optical pyrometers; comparison with numerical predictions. The present work has the objective of analysis the mechanism of start freezing blockage. The phenomenon is shown to be grade sensitive and strongly dependent of thermal history and process variability. The results and methodology can extended to similar casting problems.

ASSUNTO(S)

desenvolvimento de produto solidificação,obstrução de partida,sistema de canal refratário,aço líquido,escoabilidade do metal

ACESSO AO ARTIGO

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