Thermodynamic modeling of mineralogical phases formed by continuous casting powders

Romo-Castañeda, Julio; Cruz-Ramírez, Alejandro; Romero‐Serrano, Antonio; Vargas-Ramírez, Marissa; Hallen‐Lopez, Manuel

doi:10.1016/j.tca.2010.09.014

Cited by 7 publications

(9 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…LC steel 1233-1413, [3] 1356, [5] 1360 [6] 0.04, [7] 0.05, [4] 0.09, [7,8] 0.06-0.25, [3] 0.13, [6] 0.3 [1] 1233-1393, [3] 1340, [6] 1406 [1] MC steel 1321, [9] 1337, [9] 1362, [10] 1378, [10] 1393-1463, [3] 1423, [5] 1431 [10] 0.05, [4,7,8] 0.08, [10] 0.08-0.5, [3] 0.11, [7] 0.11-0.30, [12] 0.12, [10] 0.14, [11,12] 0.15, [10] 0.16-0.39, [1] 0.18 [7] 1373-1473, [3] 1433-1493, [1] 1493, [11] 1531 [12] Table 2. Chemical compositions (mass pct) of fluxes.…”

Section: Steel Gradementioning

confidence: 99%

“…The values of T h , viscosity η, and T br for some commercial mold fluxes reported in the literature [3][4][5][6][7][8][9][10][11][12] are listed in Table 1. For low-carbon (LC) steel, T h is in the range of 1233-1413 K; [3,5,6] η is in the range of 0.04-0.30 Pa.s, [4,7,8] and T br changes from 1233 to 1406 K. [1,3,6] Fluxes used for casting of MC steel have a higher T h of 1321-1463 K [3,5,9,10] and a T br of 1373-1531 K, [1,3,11,12] and η is in the range of 0.05-0.50 Pa.s. [4,7,8,11,12] Feed flux and flux in the mold are not the same; they have significant differences in the composition and properties.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Challenges in the Mold Flux Design: Development of F‐Free Fluxes and Fluxes for Casting of High‐Al Steel

Yang

Wang

et al. 2021

steel research int.

View full text Add to dashboard Cite

A significant research effort is directed toward development of F-free fluxes to decrease an environmental impact of steel continuous casting. Another challenging problem in the mold flux design is their stability in the casting of high-aluminum steel. This article summarizes the results of a study of F-free CaO-SiO 2 -based fluxes and CaO-Al 2 O 3 -based fluxes for the continuous casting of high-Al steels, obtained at the University of New South Wales, Sydney, in close collaboration with the Baosteel Research Centre, China. This article discusses melting properties, viscosity, flux stability, crystallization, and heat transfer of F-free CaO-SiO 2 -based fluxes and CaO-Al 2 O 3 -based fluxes, and the effect of high-Al steel-flux reaction on the flux properties. Melting properties of fluxes are determined by the hot stage microscopy method. Viscosity is measured using rotating cylindrical viscometer. Solidification of mold fluxes is examined using single and double hot thermocouple techniques (SHTT and DHTT, respectively). Continuous cooling and isothermal SHTT experiments are used to construct continuous cooling transformation (CCT) and time-temperature transformation (TTT) diagrams. Heat transfer of mold fluxes is examined using an IR emitter technique. The properties of F-free CaO-SiO 2 -based fluxes and CaO-Al 2 O 3 -based fluxes are compared with the properties of industrial mold fluxes.

show abstract

Section: Steel Gradementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Challenges in the Mold Flux Design: Development of F‐Free Fluxes and Fluxes for Casting of High‐Al Steel

Yang

Wang

et al. 2021

steel research int.

View full text Add to dashboard Cite

show abstract

“…The XRD scans were digitally recorded with a step size of 0.02°, 2θ angle ranging from 20 to 100°, reading time of 2 s and a rotation of 10 rpm. Also, thin films were prepared according to ABNT/NBR standards (ABNT, 1992). This method consists of attaching a thin slice of solidified slag on a glass slide with subsequent sanding and polishing until obtaining an approximately 30 μm-thick film.…”

Section: Figurementioning

confidence: 99%

“…According to Castañeda et al (2011), FactSage ® software can be used with a high degree of confidence for determining the main mineralogical phases formed in the mould fluxes. Therefore, it was used to determine likely phases that form during heating/cooling between 800-1500 °C.…”

Section: Phase Thermodynamic Simulationmentioning

confidence: 99%

Use of ornamental rock residues for mould flux development

Alves¹,

Voltz²,

Carvalho

et al. 2018

REM, Int. Eng. J.

View full text Add to dashboard Cite

Ornamental rock production, such as marble and granite plates, have great importance in the southeastern region of Brazil. Its residues are composed of some compounds used in continuous casting as mould fluxes. Therefore, the aim of this article was to study these residues to formulate mould fluxes. First, the raw materials were chemically characterized by energy dispersive X-ray spectroscopy (EDS) and two new fluxes were developed based on two different commercial fluxes used for peritectic and low carbon steels. All fluxes were analyzed for their ability to form crystalline phases, by performing the modified Stollberg test. The slag formed was analyzed by X-ray diffraction (XRD), thin section microscopy (TSM) technique, and a mathematical model for comparison. Also, sample fluidity was measured using the known "boat test" and viscosities were predicted by FactSage

show abstract

“…Once touching the mould wall, part of the liquid freezes into a glassy layer, followed by a crystalline layer (thickness of the glassy and crystalline layer is 1–2 mm) and a liquid flux film (0.1 mm thick) next to the surface of the strand. The solid flux layers and flux crystallinity have been reported to control the horizontal heat transfer in the mould …”

Section: Introductionmentioning

confidence: 99%

Phase Equilibria of Fluoride‐Free Boracic Mould Flux for Steel Continuous Casting

Cui

Wang

Yang

et al. 2015

steel research int.

View full text Add to dashboard Cite

Development of fluoride-free mould flux is important for steel continuous casting. Properties of the mould flux depend on the flux crystallinity. This paper analyzes phase composition of fluxes containing B 2 O 3 , TiO 2 , Na 2 O, and MgO which can be feasible candidates to replace the fluorides. The phase equilibria of these fluoride-free boracic mould fluxes were calculated using the thermochemical software FACTSage. In the process of crystallization of the CaO-SiO 2 -Al 2 O 3 -B 2 O 3 -Na 2 O flux with high CaO/SiO 2 , combeite (Na 2 , Ca)Na 2 CaSi 3 O 9 , Ca 11 B 2 Si 4 O 22 , and nepheline NaAlSiO 4 were formed, which can substitute cuspidine in the fluoride-containing fluxes. At high CaO/SiO 2 , adding MgO into CaO-SiO 2 -Al 2 O 3 -B 2 O 3 -Na 2 O-TiO 2 mould flux remarkably increased crystallization temperature by forming merwinite (Ca 3 MgSi 2 O 8 ), decreasing the relative crystal phase contents of (Na 2 ,Ca) Na 2 CaSi 3 O 9 and Ca 11 B 2 Si4O 22 . The calculated data were in reasonable agreement with results of XRD and SEM/EDS analyses of selected boracic fluxes.

show abstract

Thermodynamic modeling of mineralogical phases formed by continuous casting powders

Cited by 7 publications

References 8 publications

Challenges in the Mold Flux Design: Development of F‐Free Fluxes and Fluxes for Casting of High‐Al Steel

Challenges in the Mold Flux Design: Development of F‐Free Fluxes and Fluxes for Casting of High‐Al Steel

Use of ornamental rock residues for mould flux development

Phase Equilibria of Fluoride‐Free Boracic Mould Flux for Steel Continuous Casting

Contact Info

Product

Resources

About