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Title: Production of a non-stoichiometric Nb-Ti HSLA steel by thermomechanical processing on a Steckel mill.
Authors: Martins, Cleiton Arlindo
Faria, Geraldo Lúcio de
Mayo, Unai
Isasti, Nerea
Uranga, Pello
Rodríguez Ibabe, Jose Maria
Souza, Altair Lúcio de
Cohn, Jorge Adam Cleto
Rebellato, Marcelo Arantes
Gorni, Antônio Augusto
Keywords: Controlled rolling
Thermomechanical processing
Accelerated cooling
High-strength low-alloy steels
Nb precipitation
Issue Date: 2023
Citation: MARTINS, C. A. et al. Production of a non-stoichiometric Nb-Ti HSLA steel by thermomechanical processing on a Steckel mill. Metals, v. 13, n. 2, artigo 405, fev. 2023. Disponível em: <>. Acesso em: 15 mar. 2023.
Abstract: Obtaining high levels of mechanical properties in steels is directly linked to the use of special mechanical forming processes and the addition of alloying elements during their manufacture. This work presents a study of a hot-rolled steel strip produced to achieve a yield strength above 600 MPa, using a niobium microalloyed HSLA steel with non-stoichiometric titanium (titanium/nitrogen ratio above 3.42), and rolled on a Steckel mill. A major challenge imposed by rolling on a Steckel mill is that the process is reversible, resulting in long interpass times, which facilitates recrystallization and grain growth kinetics. Rolling parameters whose aim was to obtain the maximum degree of microstructural refinement were determined by considering microstructural evolution simulations performed in MicroSim-SM® software and studying the alloy through physical simulations to obtain critical temperatures and determine the CCT diagram. Four ranges of coiling temperatures (525–550 ◦C/550–600 ◦C/600–650 ◦ C/650–700 ◦C) were applied to evaluate their impact on microstructure, precipitation hardening, and mechanical properties, with the results showing a very refined microstructure, with the highest yield strength observed at coiling temperatures of 600–650 ◦C. This scenario is explained by the maximum precipitation of titanium carbide observed at this temperature, leading to a greater contribution of precipitation hardening provided by the presence of a large volume of small-sized precipitates. This paper shows that the combination of optimized industrial parameters based on metallurgical mechanisms and advanced modeling techniques opens up new possibilities for a robust production of high-strength steels using a Steckel mill. The microstructural base for a stable production of high-strength hot-rolled products relies on a consistent grain size refinement provided mainly by the effect of Nb together with appropriate rolling parameters, and the fine precipitation of TiC during cooling provides the additional increase to reach the requested yield strength values.
ISSN: 2075-4701
metadata.dc.rights.license: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// 4.0/). Fonte: PDF do artigo.
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