Inclusion characterisation for clean steelmaking and quality control

Kaushik, Pallava; Lowry, Michael; Yin, H.; Pielet, H.

doi:10.1179/1743281211y.0000000069

Cited by 29 publications

(18 citation statements)

References 9 publications

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“…Currently, many studies have been conducted to explore the effects of the inclusions on the machinability of the non-quenched and tempered steel [6][7][8][9][10][11][12][13][14]. Studies have shown that the sulfide in the steel mainly exists in the form of MnS [15], one of most harmful inclusions.…”

Section: Introductionmentioning

confidence: 99%

Inclusions modification and improvement of machinability in a non-quenched and tempered steel with Mg treatment

Sun

Xie

et al. 2020

Metall. Res. Technol.

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To explore the effect of Mg on the inclusions and machinability in a non-quenched and tempered steel, the industrial tests and machining experiments were carried out. The evolutions of the inclusions after Mg treatment were described and the machining effects between Mg addition and non-addition were compared. The results show that with Mg addition of 13 ppm, most of the long-strip inclusions above 50 µm were transformed into spindle and spherical inclusions with the sizes below 50 µm, and the density of inclusions increased from 197 to 356 mm2. The percentage of composite inclusions increased from 9.23 to 28.38%. The machining experiments show that the surface roughness of steel decreased from 4.64 to 2.81. After Mg–Ca treatment, the tool wear decreased from 0.164 to 0.113 mm, and the percentage of C-type chips increased from 24.37 to 79.03%.

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Section: Introductionmentioning

confidence: 99%

Inclusions modification and improvement of machinability in a non-quenched and tempered steel with Mg treatment

Sun

Xie

et al. 2020

Metall. Res. Technol.

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“…% P-content, is expected to be a substitute of steel scrap in electric arc furnaces (EAF) for steelmaking. It is well known that the phosphorus content of the feed stock for steelmaking must be strictly controlled because too high phosphorus content will cause cold brittleness and reduce the ductility brittleness of steel [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Dephosphorization Behavior of High-Phosphorus Oolitic Hematite-Solid Waste Containing Carbon Briquettes during the Process of Direct Reduction-Magnetic Separation

Cao

Zhang

Sun

2018

Metals

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In this paper, the process of direct reduction roasting using magnetic separation to produce direct reduction iron (DRI) from high-phosphorus oolitic hematite, using coal slime and blast furnace dust as reductant, is investigated. The possible use of slime coal and blast furnace dust as reductant and the dephosphorization behavior during the process of direct reduction was studied. Experimental results showed that both blast furnace dust and coal slime can be used as reductant under certain conditions in the process. The dephosphorization mechanism of blast furnace dust and coal slime were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM)-energy dispersive X-ray spectroscopy (EDS). A DRI with 91.88 wt. % iron grade, 88.38% iron recovery and 0.072 wt. % P can be obtained with 30 wt. % blast furnace dust as reductant. The program not only used blast furnace dust but also recovered iron from blast furnace dust and high-phosphorus oolitic hematite. The analysis results revealed that phosphorus is distributed in gangue mineral and fluorapatite when blast furnace dust is used as reductant. Phosphorus-bearing minerals were not reduced to phosphorus element when the blast furnace dust was the reductant, but part of the fluorapatite reduced to phosphorus which smelt into metallic iron with coal slime as reductant. This led to a high phosphorus content of DRI. This research could provide support to the idea concept for recycling of carbon-containing solid waste and to assist the effective recovery of refractory iron ore by direct reduction–magnetic separation.

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“…Therefore, the hydrogen content in steel was measured on selected heats after completion of heat processing at Stirring Station and subsequently the hydrogen content was measured during their casting in the tundish using the movable Hydris ® -Lab analyser from Heraeus Company. To study the inclusions in the steelmaking process and final products, techniques are being developed to rapidly identify inclusions in steel [7,8]. Understanding the origin of inclusions and developing practices to control their composition and content in liquid steel are key point for optimization of production processes and parameters [9,10].…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Influence of Dry Tundish Working Lining and Cold Start of Casting on Steel Cleanliness

Molnár¹,

Tréfa²,

Grimplini³

et al. 2014

Acta Metall. Slovaca Conf.

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Current global trends in the development of new materials and technologies, as well as the increasing demands for performance and lifetime of individual production units in steel casting brought several key innovative features, including the method of preparing tundish working lining and conditions for its direct utilization in the casting process. Since the worldwide introduction of dry tundish lining and cold start casting concept, there were several Research projects related to this technology from the refractory point of view, however, only limited findings were presented about its influence on liquid steel and overall casting process. Besides the initial measurements and evaluation of hydrogen pickup during casting of the first and second heat on tundish, this research work was focused on investigation of influence of mentioned technology on cleanliness of tin steel grades, especially the presence of spinel type inclusions (Al 2 O 3 x MgO) and its direct comparison with regularly used wet tundish working lining practice.

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Inclusion characterisation for clean steelmaking and quality control

Cited by 29 publications

References 9 publications

Inclusions modification and improvement of machinability in a non-quenched and tempered steel with Mg treatment

Inclusions modification and improvement of machinability in a non-quenched and tempered steel with Mg treatment

Dephosphorization Behavior of High-Phosphorus Oolitic Hematite-Solid Waste Containing Carbon Briquettes during the Process of Direct Reduction-Magnetic Separation

Influence of Dry Tundish Working Lining and Cold Start of Casting on Steel Cleanliness

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