Effect of processing parameters on scale formation during hot steel strip rolling

• Published in: Materials research (São Carlos, São Paulo, Brazil) Vol. 13; no. 1; pp. 11 - 14
• Main Authors: Lima Júnior, Sergio de Oliveira, Bellon, Júlio Cezar, Souza Júnior, Paulo Antônio de, Araújo, Fernando Gabriel da Silva, Cota, André Barros
• Format: Journal Article
• Language: English; Portuguese
• Published: ABM, ABC, ABPol 01.03.2010; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
• Subjects: ENGINEERING, CHEMICAL; hot-rolled strips; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; Mössbauer spectroscopy; tertiary scale; hot-rolled strips; tertiary scale; Mössbauer spectroscopy
• ISSN: 1516-1439; 1980-5373; 1516-1439
• DOI: 10.1590/S1516-14392010000100004

The influence of processing parameters (slab thickness, water flow of interstand cooling and oil flow in roll gap lubrication system) on the thickness and composition of the tertiary scale formed during hot strip rolling, was studied in a low carbon steel in factory. The scale formed on the rolled surface was characterized by scanning electron microscopy and Mössbauer spectroscopy. It was observed that the combined effect of a greater rolling oil volume applied, larger bar thickness, and smaller amount of water flow during interstand cooling reduces the tertiary scale thickness. Besides, a smaller crack density in the samples is associated with greater rolling oil volume and smaller oxide scale thickness. The principal phase of the scale formed in hot-rolled steel strips is stoichiometric magnetite, without isomorphic substitutions.