Control of Inclusion Composition in Calcium Treated Aluminum Killed Steels

Zhao, Dong-wei; Li, Haibo; Chen, Yang; Yang, Jianguo

doi:10.2355/isijinternational.isijint-2016-123

Cited by 18 publications

(9 citation statements)

References 13 publications

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“…First-order interaction coefficients in this study. [29,36,37] carbon and sulfur analyzer (HORIBA EMIA-920V2, Japan). And other elements were tested by optical emission spectrometer (ThermoFisher ARL-8860, USA).…”

Section: Methodsmentioning

confidence: 99%

Evolution of Calcium Aluminate Inclusions by Cerium Treatment in Al‐Killed Steel during Ruhrstahl–Heraeus Refining Process

Geng

Shi

2020

steel research int.

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The effect of cerium addition during Ruhrstahl–Heraeus (RH) refining process on liquid calcium aluminum inclusion in Al‐killed steel is studied based on plant trials and thermodynamic calculation. Before cerium addition, liquid calcium aluminum inclusion surrounded by an outer CaS layer are observed. Cerium modified liquid calcium aluminum inclusion to CeAlO3 + CaS + CaO–Al2O3 complex inclusion. The modification process of liquid calcium aluminum inclusion by cerium is different from that of solid Al2O3 or MgO·Al2O3 inclusion and can be concluded as following. Cerium added into molten steel reacts first with liquid calcium aluminum inclusion in molten steel. Then the solid CeAlO3 and CaO, as reaction product, are surrounded by liquid calcium aluminum. At the same time, CaO reacts with dissolved sulfur, resulting in the generation of CaS inclusions.

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Section: Methodsmentioning

confidence: 99%

Evolution of Calcium Aluminate Inclusions by Cerium Treatment in Al‐Killed Steel during Ruhrstahl–Heraeus Refining Process

Geng

Shi

2020

steel research int.

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“…These inclusions could become B type stringer inclusions (mainly calcium aluminate) after the hot rolling process, especially in bulky plate steels. The calcium aluminate with low melting point (12CaO•7Al 2 O 3 ) was easy to transform during hot rolling, and this would also become a B type stringer inclusion [23,24].…”

Section: Resultsmentioning

confidence: 99%

Study on the Control of Rare Earth Metals and Their Behaviors in the Industrial Practical Production of Q420q Structural Bridge Steel Plate

Chu

Fan

et al. 2018

Metals

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Rare earth (RE) addition can refine and change the shape/distribution of inclusions in steel to improve its strength and toughness. In this paper, the control of RE, specifically Ce and La, and their behaviors in the practical industrial production of high-strength structural steel with 420 MPa yield strength were studied. In particular, the interactions between RE and Al, Nb, S, O were investigated, with the aim of improving the steel toughness and welding performance. The impact energy of the plate with RE is approximately 50 J higher than the regular plate without RE. The toughness of the plate from ladle furnace (LF) refining with RE addition is better than the one from Ruhrstahl and Hereaeus (RH) refining. The RE inclusions could induce the intragranular ferrite and refine the grain size to the preferred size. After welding at the heat input of 200 kJ/cm, the grain size at the heat affected zone was found to be the finest in the plate from the LF process with RE addition. Notably, the microstructure of ferrite was quasi-polygonal.

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“…According to Equations ( 4)- (7), the [Ca]-[Al] equilibrium relationship of C 12 A 7 and C 3 A liquid inclusions is further sorted out, as shown in Equations ( 8) and ( 9), and the equilibrium constant K Θ is calculated by Equation (10).…”

Section: Thermodynamic Calculation Of [Al]-[ca] Equilibrium Of Liquid...mentioning

confidence: 99%

“…Based on the published papers , the industrial experimental research results with calcium treatment from 2011 to 2021 are summarized as shown in Table 1. According to Table 1, thermodynamic calculation and SEM-EDS analysis are widely used to study the formation and modification mechanism of inclusions in different steel grades, the evolution law of compositions, sizes, numbers and morphology characteristics of the different inclusions after calcium treatment in different steel grades [1][2][3]6,8,10,[12][13][14][21][22][23][24][25][26], and the optimization and improvement of calcium treatment process [4,5,9,20,29], as well as the mechanism reducing nozzle nodulation and the degree of tundish stopper erosion with calcium treatment [27,28]. The modification and local concentration of inclusions, rate-controlling step of inclusion modification and change of inclusion compositions with different reaction times in calcium treatment steel can be studied in combination with numerical simulation and kinetic models [7,11,[15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Evolution behaviour and modification mechanism of inclusions in NM500 wear-resistant steel with calcium treatment

Sun

Yang

2022

Ironmaking & Steelmaking

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In this article, the industrial experiments of calcium treatment on the modification of inclusions in NM500 wear-resistant steel were carried out. There are four types of inclusions, which are Type A of Al2O3 based inclusions, Type C of inclusions containing CaO without S, Type S of inclusions containing S, and Type M of MnS. Three types of CaO•MgO•Al 2 O 3 inclusions after calcium treatment are embedded MgO

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Control of Inclusion Composition in Calcium Treated Aluminum Killed Steels

Cited by 18 publications

References 13 publications

Evolution of Calcium Aluminate Inclusions by Cerium Treatment in Al‐Killed Steel during Ruhrstahl–Heraeus Refining Process

Evolution of Calcium Aluminate Inclusions by Cerium Treatment in Al‐Killed Steel during Ruhrstahl–Heraeus Refining Process

Study on the Control of Rare Earth Metals and Their Behaviors in the Industrial Practical Production of Q420q Structural Bridge Steel Plate

Evolution behaviour and modification mechanism of inclusions in NM500 wear-resistant steel with calcium treatment

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