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Proceedings of the Seminar on Steelmaking, Casting and Non-Ferrous Metallurgy

ISSN 2594-5300

46º Seminário de Aciaria - Internacional — vol. 46, num.46 (2015)

Title

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

Authorship

Madias, Jorge; Moreno, Alberto; Genzano, Cristian

Madias, Jorge
Madias, Jorge

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Moreno, Alberto
Moreno, Alberto

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Genzano, Cristian
Genzano, Cristian

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DOI

10.5151/1982-9345-26292

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Abstract

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.

 

Keywords

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

Oxygen

How to refer

Madias, Jorge; Moreno, Alberto; Genzano, Cristian. BILLET DEFECTS: PIN-HOLE AND BLOW-HOLE FORMATION, PREVENTION AND EVOLUTION , p. 154-164. In: 46º Seminário de Aciaria - Internacional, Rio de Janeiro, 2015.
ISSN: 2594-5300 , DOI 10.5151/1982-9345-26292