Effect of Size of Ferrotitanium on the Melting Behavior and the Yield in the Refining of Interstitial Free Steel by RH De-gasser

Zhang, Chaojie; Bao, Yanping; Tang, Dechi; Ji, Chenxi; Wang, Leichuan; Chen, Yang; Li, Haibo

doi:10.2355/isijinternational.isijint-2018-292

Cited by 6 publications

(5 citation statements)

References 16 publications

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“…When an alloy piece is dropped into the melt, a solid steel shell will form outside the alloy due to the temperature difference between the alloy piece and the steel melt. [20,[53][54][55] A reaction zone between the alloy and steel shell will form, and the inclusions from the alloy can move or stay depending on the state of the reaction zone. Previous studies have reported this kind of phenomenon.…”

Section: Evolution Mechanism Of the Inclusions In Steelmentioning

confidence: 99%

Effect of LCFeCr Alloy Additions on the Non-metallic Inclusion Characteristics in Ti-Containing Ferritic Stainless Steel

Wang

Kim

et al. 2021

Metall Mater Trans B

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The influence of commercial low carbon ferrochromium (LCFeCr) additions on the inclusion characteristics in Ti-containing ferritic stainless steel was studied by laboratory experiment in this work. The inclusions in steel before and after the FeCr alloy additions were investigated through systematic samplings and microscopy investigations of the liquid steel. Different types of inclusions in the FeCr alloy and steel were detected and the evolution of the inclusion characteristics (e.g., composition, size, morphology, and number density) were investigated. The results showed that the Ti content decreased after the FeCr alloy additions. Furthermore, MnCr2O4 spinel inclusions originating from the FeCr alloys transformed into Ti2O3–Cr2O3-based liquid inclusions and Ti2O3-rich solid inclusions. They were formed due to the reactions between MnCr2O4 and TiN inclusions or dissolved Ti in molten steel. The ratio of Ti/Al in the steel melt has a direct influence on the evolution of inclusions from thermodynamic calculations. The addition of FeCr alloys caused an increased number density of these Ti2O3-containing inclusions and TiN inclusions up to 8 minutes from the time of alloy addition. The increased Cr content from 16 to 24 mass pct due to the FeCr additions can increase the critical N content to form TiN inclusions at a specific Ti content. Overall, this study has contributed to the understanding the behavior of inclusions from LCFeCr alloy during the alloying process in Ti-containing steel.

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Section: Evolution Mechanism Of the Inclusions In Steelmentioning

confidence: 99%

Effect of LCFeCr Alloy Additions on the Non-metallic Inclusion Characteristics in Ti-Containing Ferritic Stainless Steel

Wang

Kim

et al. 2021

Metall Mater Trans B

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“…Titanium addition in chromium cast iron leads to improvement of its wear resistance [3,4]. Additionally, titanium compounds in steel plays three important functions: degassing, preventing grain growth during heating before rolling and forming of socalled strong frame for rise of metal strength properties [5][6][7]. It mainly predetermines both general titanium consumption and its production volumes.…”

Section: Introductionmentioning

confidence: 99%

Study of possibility of manufacture of the complex titanium-containing ferroalloy via single-stage carbothermal method

Vorobkalo¹,

Makhambetov²,

Baisanov³

et al. 2022

cisisr

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The object of research is the melting technology of a complex titanium-containing ferroalloy by single-stage slagfree carbothermal method using high-ash coals as a reducing agent. The ilmenite concentrate (Shokash deposit, Aktobe region, Kazakhstan), rich titanium slag, which was obtained by the scientists of the Chemical and Metallurgical Institute named after Zh. Abishev (Karaganda, Kazakhstan), as well as high-ash coal as a reducing agent were used as charge materials. Several physical-chemical characteristics of used charge materials were previously studied to carry out large-scale labour tests on the complex titanium-containing ferroalloy melting via single-stage slag-free carbothermal method. The chemical and phase composition of materials was established and two optimal compositions of the charge mixture for alloy melting were selected on their basis. The first composition contains: coal -67.35 %; rich titanium slag -26.12 %; quartzite -6.5 %. The second composition includes^ coal -66.95 %; rich titanium slag -23.1 %; ilmenite -3.3 %; quartzite -6.61 %. Tests for melting of a new complex titanium-containing ferroalloy were conducted in the ore-smelting furnace with 0.2 MVA transformer power. As a result of the tests, a batch of new complex titanium-containing ferroalloy was obtained, with the following average chemical composition: Ti -18-21 %; Si -35-45 %; Al -10-20 %; P is no more than 0.08 %, the rest is Fe. Also metallographic studies of the alloy sample were carried out in the work. The obtained alloy according corresponds in its titanium content to the brand FeTi25 (GOST 4761-91). The test results showed the principal possibility of obtaining a new complex titanium-containing ferroalloy from rich titanium slag and ilmenite concentrate using high-ash coal as a reducing agent.

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“…Rodríguez-Avila et al [11] established a numerical-multiphase fluid flow model and studied the dynamics of alloy additions during steel tapping operations. Zhang et al [12] focused on the motion trajectory of ferrotitanium after the addition into molten steel in RH de-gasser, and found out that ferrotitanium should not be larger than a critical size in order to ensure a high yield. Therefore, there will be great economic benefits if the yields of ferroalloys are increased.…”

Section: Introductionmentioning

confidence: 99%

Loss mechanism of micro-carbon ferromanganese during RH refining

Zhang

Bao

Zhang

et al. 2021

Ironmaking & Steelmaking

Self Cite

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It is of great significance to improve the yield of ferroalloy for steelmaking to reduce cost and save energy. In this paper a kind of loss mechanism of micro-carbon ferromanganese which has micro content of carbon during RH refining of interstitial free steel was investigated. The flow field of argon gas in the RH degassing vessel was investigated through numerical simulation. Through force analysis and particle tracking of the micro-carbon ferromanganese, it was found that microcarbon ferromanganese with size smaller than the critical value of 1.01 millimeters has a large probability to be carried away into the RH vacuum pipeline. The micro-carbon ferromanganese of small particle was easily lost into the vacuum pipe by the upward flow of argon gas. Industrial experiment was conducted and a novel mechanism was confirmed that increasing the vacuum pressure during addition of the micro-carbon ferromanganese could improve the yield greatly.

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Effect of Size of Ferrotitanium on the Melting Behavior and the Yield in the Refining of Interstitial Free Steel by RH De-gasser

Cited by 6 publications

References 16 publications

Effect of LCFeCr Alloy Additions on the Non-metallic Inclusion Characteristics in Ti-Containing Ferritic Stainless Steel

Effect of LCFeCr Alloy Additions on the Non-metallic Inclusion Characteristics in Ti-Containing Ferritic Stainless Steel

Study of possibility of manufacture of the complex titanium-containing ferroalloy via single-stage carbothermal method

Loss mechanism of micro-carbon ferromanganese during RH refining

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