Formation and evolution of macro inclusions in IF steels during continuous casting

Deng, Xiaoxuan; Ji, Chenxi; Chen, Yang; Tian, Zhaopeng; Yin, Xiaochun; Shao, Xin; Yang, Yindong; McLean, Alex

doi:10.1080/03019233.2017.1368958

Cited by 32 publications

(26 citation statements)

References 30 publications

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“…Cui et al and Rödl et al found Ti‐rich phases, either FeO.TiO 2 or Al 2 O 3 .TiO 2 , acting as binder phase between alumina inclusions. Other investigations revealed the presence of different layers, from coarse alumina clusters near the liquid steel to Al 2 O 3 –TiO 2 ‐layers at the steel refractory interface . Additionally alumina inclusions with low contents of TiO x were found by several authors .…”

Section: Introductionmentioning

confidence: 90%

“…In most cases the occurrence of Ti‐bearing phases and inclusions is also accompanied by certain amounts of entrapped and solidified steel within the clogging structure, caused by the increased wettability of Al 2 O 3 –TiO x inclusions. A widespread theory believes in local reoxidation in the casting system as the origin of these particles …”

Section: Introductionmentioning

confidence: 99%

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Study on the Influence of FeTi‐Addition on the Inclusion Population in Ti‐Stabilized ULC Steels and Its Consequences for SEN‐Clogging

Dorrer

Michelic

Bernhard

et al. 2019

steel research int.

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During the continuous casting of Ti-stabilized ULC/IF steel grades clogging of the submerged entry nozzle (SEN) is frequently observed. A new statistical evaluation indicates that increasing Ti/Al-ratios in these steels lead to an increase in the occurrence of clogging and its intensity. Investigations of samples of two TiULC heats, taken at the RH-degasser, show a remarkable increase of inclusions due to FeTi-addition. The presence of Ti-bearing alumina particles contrary to the thermodynamical expectations, indicate that their formation takes place as a consequence of FeTi-addition. Laboratoryscale experiments confirm the formation of alumina inclusions containing traces of Ti. Their size is found to be significantly smaller compared to pure alumina inclusions. Rising numbers of small inclusions within the steel are suspected to accelerate the buildup of clogging deposits. Two mechanisms are proposed to explain the formation of these particles. On the one hand ferrotitanium acts as a source of oxygen, resulting in the formation of new inclusions during dissolution. On the other hand, the modification of preexisting deoxidation products in regions with high Ti-contents may play a role.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Study on the Influence of FeTi‐Addition on the Inclusion Population in Ti‐Stabilized ULC Steels and Its Consequences for SEN‐Clogging

Dorrer

Michelic

Bernhard

et al. 2019

steel research int.

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4]. Hence, the removal of inclusions from the molten steel is a critical issue throughout the steelmaking process.…”

Section: Introductionmentioning

confidence: 99%

Modelling on Inclusion Motion and Entrapment during the Full Solidification in Curved Billet Caster

Yin

Zhang

Dong

et al. 2018

Metals

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Abstract:Inclusions entrapped by the solidifying front during continuous casting would deteriorate the properties of the final steel products. In order to investigate the inclusion motion and the entrapment during the full solidification in curved billet caster, the present work has developed a three-dimensional numerical model coupling the flow, solidification, and inclusion motion. The predicted result indicates that the inclusion distribution inside the liquid pool of the mold is not perfectly symmetrical. Furthermore, the motion and the entrapment of micro inclusions in the mold are mainly affected by the molten steel flow pattern, however, those of macro inclusions depend both on the molten steel flow pattern and the buoyancy force of the inclusions. In the curved part of the strand, macro inclusions shift to the solidifying front of the inner radius as time goes on, while the solidifying front of the outer radius cannot entrap inclusions. The distributions of inclusions smaller than 5 µm in the solidified strand are even. However, for inclusions that are larger than 5 µm, their distributions become uneven. To validate the model, measurement of the strand surface temperature and the detection of inclusions in samples obtained from a plant have been performed. Good agreement is found between the predicted and experimental results.

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“…In addition, large inclusions would also be formed during casting process. The composition evolution, growth, and collision of non‐metallic inclusions during casting process have also attracted more and more attention . Choi et al investigated the evolution of oxide inclusions during solidification in 304 stainless steel slab .…”

Section: Introductionmentioning

confidence: 99%

“…They concluded that a combination of pre‐existing inclusions and inclusions precipitated during solidification caused composition change. Deng et al investigated formation and evolution of macro‐inclusions in IF steels during continuous casting and found that mass fraction of Al 2 O 3 in inclusions increased in steel slab . Nurmi et al reported that new inclusions formed during solidification in high‐carbon Si/Mn‐deoxidized steel .…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism of Large Inclusions in 80t 20Cr–8Ni Stainless Steel Casting for Nuclear Power

Wang

Cheng

et al. 2019

steel research int.

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80t 20Cr-8Ni stainless steel castings are used to manufacture pump casing for nuclear power. However, large inclusions are usually observed on an ingot surface, which cause failure in penetrant testing. To clarify the formation mechanism of large inclusions, the evolution, growth, and aggregation of inclusions during the argon oxygen decarburization furnace (AOD) refining-Ca treatment-ingot casting process are investigated. The results show that Al 2 O 3 clusters >50 μm and single Al 2 O 3 particles >10 μm are typical large inclusions on ingot surface. After aluminum addition in AOD, typical inclusions are spinel or dual-phase CaO-MgO-Al 2 O 3 . After Ca treatment, typical inclusions are liquid or dual-phase CaO-MgO-Al 2 O 3 . With temperature decreasing during casting process, the mass fraction of Al 2 O 3 keeps on increasing due to decreasing oxygen and aluminum solubility. It is concluded that Al 2 O 3 is formed during casting process. Single Al 2 O 3 particles grow up to ≥7.5 μm or more. With the size of single Al 2 O 3 particles increasing, Al 2 O 3 clusters are formed mainly through Stokes and turbulent collision. In addition, the aggregation area of single Al 2 O 3 particles and Al 2 O 3 clusters is formed on the surface of ingot.

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Formation and evolution of macro inclusions in IF steels during continuous casting

Cited by 32 publications

References 30 publications

Study on the Influence of FeTi‐Addition on the Inclusion Population in Ti‐Stabilized ULC Steels and Its Consequences for SEN‐Clogging

Study on the Influence of FeTi‐Addition on the Inclusion Population in Ti‐Stabilized ULC Steels and Its Consequences for SEN‐Clogging

Modelling on Inclusion Motion and Entrapment during the Full Solidification in Curved Billet Caster

Formation Mechanism of Large Inclusions in 80t 20Cr–8Ni Stainless Steel Casting for Nuclear Power

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