Impacts of Modification of Alloying Method on Inclusion Evolution in RH Refining of Silicon Steel

Li, Fangjie; Li, Huigai; Zheng, Shiyou; You, Jinglin; Han, Ke; Zhai, Qijie

doi:10.3390/ma10101206

Cited by 8 publications

(5 citation statements)

References 21 publications

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“…Figure 9 shows the morphology of the SSD and SSW compacts before and after carbonation for 24 h (D-C24 and W-C24) and the carbonated compacts after seawater curing for 28 days (D-W28 and W-W28). The chemical composition of particles with typical morphology were tested by EDS spectra to assist with analysing their mineralogy [ 44 , 45 , 46 ]. As shown in Figure 9 a,b, the particles in both SSD and SSW became aggregated and/or agglomerated after mixing and moulding.…”

Section: Resultsmentioning

confidence: 99%

Carbonation Curing on Magnetically Separated Steel Slag for the Preparation of Artificial Reefs

Zhao

Song

et al. 2022

Materials

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Magnetic separation is an effective method to recover iron from steel slag. However, the ultra-fine tailings generated from steel slag become a new issue for utilization. The dry separation processes generates steel slag powder, which has hydration activity and can be used as cement filler. However, wet separation processes produce steel slag mud, which has lost its hydration activity and is no longer suitable to be used as a cement filler. This study investigates the potential of magnetically separated steel slag for carbonation curing and the potential use of the carbonated products as an artificial reef. Steel slag powder and steel slag mud were moulded, carbonation-cured and seawater-cured. Various testing methods were used to characterize the macro and micro properties of the materials. The results obtained show that carbonation and hydration collaborated during the carbonation curing process of steel slag powder, while only carbonation happened during the carbonation curing process of steel slag mud. The seawater-curing process of carbonated steel slag powder compact had three stages: C-S-H gel formation, C-S-H gel decomposition and equilibrium, which were in correspondence to the compressive strength of compact increasing, decreasing and unchanged. However, the seawater-curing process of carbonated steel slag mud compact suffered three stages: C-S-H gel decomposition, calcite transfer to vaterite and equilibrium, which made the compressive strength of compact decreased, increased and unchanged. Carbonated steel slags tailings after magnetic separation underwent their lowest compressive strength when seawater-cured for 7 days. The amount of CaO in the carbonation active minerals in the steel slag determined the carbonation consolidation ability of steel slag and durability of the carbonated steel slag compacts. This paper provides a reference for preparation of artificial reefs and marine coagulation materials by the carbonation curing of steel slag.

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Section: Resultsmentioning

confidence: 99%

Carbonation Curing on Magnetically Separated Steel Slag for the Preparation of Artificial Reefs

Zhao

Song

et al. 2022

Materials

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“…Detailed information on the FeO-MnO inclusion formation after MCFeMn additions during the RH refining was reported by Li et al [88] They showed that spherical 3FeOAEMnO inclusions that were formed before the melt reached the solidification temperature could later act as heterogeneous nucleation sites for FeOAEzMnO shelled inclusions. Figure 16 represents the different Fe/Mn ratios in the core and shell of the inclusions, which have different solidification temperatures, and their evolution mechanism.…”

Section: Femn Alloysmentioning

confidence: 95%

“…Fig. 16-Fe/Mn ratio in the core and shell of FeO-MnO inclusions (a) and schematic illustration of the evolution of FeO-MnO inclusions (b).Reprinted from Ref [88],. under the terms of the Creative Commons CC BY license.…”

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confidence: 99%

Non-metallic Inclusions in Different Ferroalloys and Their Effect on the Steel Quality: A Review

Wang

Karasev

Park

et al. 2021

Metall Mater Trans B

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Ferroalloys have become increasingly important due to their indispensable role in steelmaking. In addition, the demand for improved steel qualities has increased considerably, which in turn highlights the quality of ferroalloys. This is due to the fact that the impurities in ferroalloys directly and significantly influence the quality of steel products. To gain a better understanding of the main trace elements and inclusions in ferroalloys (such as FeSi, FeMn, SiMn, FeTi, FeCr, FeMo, FeNb, FeV, FeB, some complex ferroalloys) and their behaviours in steel melt after the additions of these ferroalloys, information from a large number of previous results on this topic was extensively reviewed in this work. The applications of different ferroalloys and their production trends were discussed. In addition, the effects of some trace element impurities from ferroalloys on the inclusion characteristics in steel were also discussed. The possible harmful inclusions in different ferroalloys were identified. Overall, the results showed that the inclusions present in ferroalloys had the following influence on the final steel cleanliness: (1) MnO, MnS and MnO–SiO2–MnS inclusions from FeMn and SiMn alloys have a temporary influence on the steel quality; (2) the effect of large size SiO2 inclusions (up to 200 μm) in FeSi and FeMo alloys on the steel cleanliness is not fully understood. The effect of Al, Ca contents should be considered before the addition of FeSi alloys. In addition, Al2O3 inclusions and relatively high Al content are commonly found in FeTi, FeNb and FeV alloys due to their production process. This information should be paid more attention to when these ferroalloys are added to steel; (3) except for the existing inclusions in these alloys, the Ti-rich, Nb-rich, V-rich carbides and nitrides, which have important effects on the steel properties also should be studied further; and (4) specific alloys containing REM oxides, Cr–C–N, Cr–Mn–O, Al2O3, Al–Ti–O, TiS and Ti(C, N) have not been studied enough to enable a judgement on their influence on the steel cleanliness. Finally, some suggestions were given for further studies for the development of ferroalloy productions.

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“…They all believed that there are big differences between one steel and another, for their types of the inclusions and the effects of these inclusions on any one property of the two steels [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Hence, even if some of these scholars maintained that inclusions could affect the magnetic properties of some silicon steel, but they did not concerned exclusively with inclusions and did not identify one concrete grade of silicon steel [11][12][13][14][15]. However, each grade of non-oriented silicon steel has its own types of inclusions, thus the mechanism by which inclusions affect the magnetic properties of different grades of silicon steel would not be the same.…”

Section: Introductionmentioning

confidence: 99%

A statistical study of inclusions in medium-grade non-oriented silicon steel

Kong

Chen

Cang

2019

Metall. Res. Technol.

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There are always differences between the magnetic properties (core loss and magnetic induction) of the head and those of the tail, with the same chemical composition, in a medium-grade non-oriented silicon steel coil (or MGNO for short). To work out the reason leading to the differences and get methods to increase the magnetic properties, this paper studied the types and the distribution of the inclusions in MGNO, and the effects of the inclusions on the magnetic properties of the MGNO, by using SEM + FEEM observation and statistic analysis. The results show that there are oxide inclusions, sulfide inclusions, nitride inclusions and composite inclusions in the MGNO. More inclusions shorter than 500 nm are bad for the magnetic properties of the MGNO. On a lower order of the sizes, the number of the inclusions would more obviously affect the MGNO on its magnetic properties. The Al2O3 shorter than 1 µm and the MnS whose size is 100∼500 nm are the main inclusions that decrease the magnetic properties of the MGNO. In order to get better magnetic properties of the MGNO, the steelmaking process and the hot rolling process should be improved, chiefly the RH and the heat furnace.

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Impacts of Modification of Alloying Method on Inclusion Evolution in RH Refining of Silicon Steel

Cited by 8 publications

References 21 publications

Carbonation Curing on Magnetically Separated Steel Slag for the Preparation of Artificial Reefs

Carbonation Curing on Magnetically Separated Steel Slag for the Preparation of Artificial Reefs

Non-metallic Inclusions in Different Ferroalloys and Their Effect on the Steel Quality: A Review

A statistical study of inclusions in medium-grade non-oriented silicon steel

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