Applications of Multicomponent Databases to the Improvement of Steel Processing and Design

Silva, André Luiz Vasconcellos da Costa e

doi:10.1007/s11669-017-0575-2

Cited by 9 publications

(2 citation statements)

References 55 publications

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“…It has been established that the change in solubility during the L δ → transformation is important to the formation of pinholes and similar defects during solidification [9,10]. Currently, this is relatively well modelled [11]. The diffusion of hydrogen through δ , in the early stages of continuous casting seems to play an important role in the occurrence of breakout in continuous casting of steels containing somewhere over 6-8ppm hydrogen [12,13].…”

Section: H O 2h O = +mentioning

confidence: 99%

A predictive model for hydrogen content in steel in non-degassed heats

Lopes¹,

Castro²,

Demuner³

et al. 2021

Tecnol. Metal. Mater. Min.

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Hydrogen may cause several problems during steel processing. Issues caused or enhanced by hydrogen range from different types of bubbles such as pinholes to breakout during continuous casting. Further down the line, segregation and embrittlement may lead to cracking such as flaking or blistering. These problems impact plant productivity and have cost impacts on equipment maintenance and the need for additional steel treatment. Some of the problems lead to scraping. Although vacuum degassing effectively controls the hydrogen content of steel, it introduces additional costs that are not justifiable for many products. This work aims to identify the main sources of hydrogen in liquid steel in the Ternium Brazil steelmaking plant and to propose a model to decide the need for hydrogen measurement for the degassing process, focusing on steels for which vacuum degassing is not a specification requirement. It is essential for these steels to guarantee a controlled level of dissolved hydrogen to avoid problems, mostly at casting. Once the sources are identified, a model is developed to predict the hydrogen content at the beginning of the secondary metallurgy treatment. Based on the model, it is proposed that hydrogen should be measured or not at this step to decide if vacuum degassing is required to assure safety in casting.

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Section: H O 2h O = +mentioning

confidence: 99%

A predictive model for hydrogen content in steel in non-degassed heats

Lopes¹,

Castro²,

Demuner³

et al. 2021

Tecnol. Metal. Mater. Min.

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“…For steel processed in LF under ideal conditions of agitation and with due care to prevent reoxidation, it has been observed that the final composition is very close to equilibrium (e.g. (2,15)). In this case, the equilibrium of all possible oxidation reactions should prevail and a single value of oxygen in solution should satisfy all the calculated equilibria, as indicated in Figure 1.…”

Section: Deoxidation Thermodynamics and Kineticsmentioning

confidence: 99%

Avaliação Do Equilibrio Metal-Escória Em Metalurgia Secundária

Silva¹,

Silva²,

Leitão³

et al. 2018

ABM Proceedings

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Resumo Steel-slag reactions are of paramount importance in steelmaking, in special in secondary steelmaking. Currently, desulfurization, deoxidation and inclusion removal are mostly performed during ladle processing. The extent to which these reactions proceed is governed by the initial state of the material reaching the ladle, the additions made to the ladle and by undesired interactions such as reoxidation and steelrefractory reactions. In this work fundamental thermodynamic aspects involved in ladle refining of Al-killed and Si-Mn deoxidized steel are briefly reviewed. Using thermodynamics, the extent to which equilibrium is approached for the different deoxidation reactions is evaluated. These results are compared to measurements performed in industrial ladle furnaces. Based on this comparison, observations are made with respect of the efficiency of the refining process. It is concluded that the relationship between agitation and reoxidation by air play a key role on the ability to reach low and controlled oxygen in steel. It is also concluded that relatively long treatments with controlled agitation are needed to achieve steel-slag equilibrium..

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Using Computational Thermodynamics to Understand the Evolution of Solidification Segregation during Steel Processing

Silva

2020

J. Phase Equilib. Diffus.

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Applications of Multicomponent Databases to the Improvement of Steel Processing and Design

Cited by 9 publications

References 55 publications

A predictive model for hydrogen content in steel in non-degassed heats

A predictive model for hydrogen content in steel in non-degassed heats

Avaliação Do Equilibrio Metal-Escória Em Metalurgia Secundária

Using Computational Thermodynamics to Understand the Evolution of Solidification Segregation during Steel Processing

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