Hydrogen Potential Sources in Refractory Materials during Steel Casting

Bragança, Saulo Roca; Hohemberger, João Marcos; Vicenzi, Juliane; Marques, Caio Marcelo; Basegio, Tania Maria; Lima, Álvaro Niedersberg Correia; Bergmann, Carlos Pérez

doi:10.1002/srin.200606405

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…It was also found the possibility to reduce hydrogen pick-up with inertization. Bragança et al [7] did a work about this subject. The results of their research showed that not only the control of the humidity content in refractory materials is critical, but the phase transformations that the materials suffer during the casting process are important as well.…”

Section: Mathematical Modelmentioning

confidence: 99%

Continuous Casting Tundish Inertization: A Comparative Study

Ferreira¹

2022

ABM Proceedings

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Inertization in continuous casting tundish is essential in first heats of a sequential to avoid reoxidation and hence the rising of non-metallic inclusions in steel. Nowadays steel shops are looking for the best practices in this concern. There are several ways to conduct this process in a continuous casting tundish in order to have proper steel cleanliness. In this paper, some techniques to carry out such process are discussed aiming to provide industry a source of information about the topic tundish inertization.

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Section: Mathematical Modelmentioning

confidence: 99%

Continuous Casting Tundish Inertization: A Comparative Study

Ferreira¹

2022

ABM Proceedings

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“…Refractories [29]: proper drying and outgassing of refractories (and their repairs): converter, ladle, tundish, entry nozzle, submerged tube [25] Gases: purity of oxygen, bottom gas blown in converter, humidity in the air (on top of steel in converter, ladle and tundish) and entrained during exposed pouring operations [27].…”

Section: Hydrogen Sourcesmentioning

confidence: 99%

“…Two strategies have been followed in steel plants to prevent hydrogen problems while controlling processing cost: (a) Evaluating the sources of hydrogen in the steelmaking process (e.g. [6,7,10,[23][24][25]); (b) creating models to estimate the hydrogen content at some step of the melt shop process (e.g. [13,26,27]).…”

Section: Hydrogen Sourcesmentioning

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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“…Liquid steel can pick up hydrogen during steelmaking and casting from refractories, [1] alloys, recarburizers, process gases and additives for slag formation, as hydrogen is strongly soluble. The gravity of such phenomenon also depends on the content of micro-alloying elements, such as manganese.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Critical Hydrogen Concentration in As‐Cast and Hot‐Rolled Billets in Medium Carbon Steels

Colla

Valentini

2020

steel research int.

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The presence of hydrogen severely affects the mechanical properties of semi‐manufactured and final steel products. Such presence is affected by different factors which show up throughout the whole manufacturing process and varies during the different stages according to both product features and various process parameters. This article presents an experimental methodology to assess the critical hydrogen concentration in as‐cast and hot‐rolled billets in medium carbon steels, which allows highlighting their robustness to hydrogen embrittlement. Such approach is based on a combination of hydrogen‐induced cracking and slow strain rate tensile tests, which are conducted on both as‐cast and hot‐rolled billets samples. The experiments highlight that the hydrogen presence is more critical on the as‐cast semi‐products than on the hot‐rolled billets, which show a higher robustness, as they can tolerate higher values of hydrogen content.

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Hydrogen Potential Sources in Refractory Materials during Steel Casting

Cited by 7 publications

References 4 publications

Continuous Casting Tundish Inertization: A Comparative Study

Continuous Casting Tundish Inertization: A Comparative Study

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

Assessment of Critical Hydrogen Concentration in As‐Cast and Hot‐Rolled Billets in Medium Carbon Steels

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