Título

BILLET DEFECTS: PIN-HOLE AND BLOW-HOLE FORMATION, PREVENTION AND EVOLUTION

Autoria

Madias, Jorge; Moreno, Alberto; Genzano, Cristian

Madias, Jorge

Eu sou esse autor

Moreno, Alberto

Eu sou esse autor

Genzano, Cristian

Eu sou esse autor

DOI

10.5151/1982-9345-26292

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Resumo

Pin holes as a surface defect, and blow holes as an inner defect, occur in billet / bloom / beam blank casting, particularly for Si-Mn killed steel cast with metering nozzle and oil lubrication. If they are present in abundance or have a large size, they may originate defects in the rolled products. Their characteristics, factors behind their formation, as well as usual processing conditions that promote their occurrence are discussed. Finally, the evolution of these defects during reheating and rolling is analyzed, with industrial examples.

Palavras-chave

Billet casting, Metering nozzle, Pin-hole, Blow-hole, Oil lubrication, Nitrogen, Hydrogen, Oxygen

Oxygen