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Title

OPTIMIZATION OF ROLLING PARAMETERS FOR THE PRODUCTION OF REBAR (NTP 341031)

Authorship

Neto, Antônio Aldenor Pinheiro; Vieira, Matheus de Lima

Neto, Antônio Aldenor Pinheiro

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Vieira, Matheus de Lima

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DOI

10.5151/9785-9785-32238

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Abstract

In mid-2015 the steel industry faced a strong crisis due to the weak performance of the Brazilian economy and the persistent entry of Chinese steel into Brazilian territory. This situation demanded that Brazilian steelmakers seek to develop products to meet new export markets. Within the volume of exports possible are the rebars, where its applications are in the construction industry. One of the largest importers is Peru which has a large percentage of this export volume. This market demands as a priority requirement the surface quality of Blue Condition (low oxidation index) and mechanical properties normative. In order to meet the items required by the customer at a competitive cost, a vanadium micro-alloyed steel was applied to the hot rolling process without heat treatment after the last rolling pass. Where the great challenge was to achieve a high level of stretching without compromising the minimum limits of resistance and flow. Assuming that the steel used is the correct one interventions were made on rolling parameters such as set-point temperature, residence time of pieces in the furnace, linear mass and rolling speed. All the changes made were based on statistical tools and practical tests. Finally, with the execution of actions generated from the statistical analyzes and tests it was possible to reduce process losses by 96%.

Keywords

rebars; rolling mill; reheat furnace; micro-alloyed