Constitutional Segregation of Al2O3 in Mold Slag and Its Impact on Steel Cleanliness During Continuous Casting

2013 ◽  
Vol 44 (5) ◽  
pp. 1185-1189 ◽  
Author(s):  
P. Palai ◽  
P. P. Sahoo ◽  
Arghya Dey ◽  
T. K. Roy ◽  
V. V. Mahashabde
Keyword(s):  
Continuous Casting ◽  
Mold Slag ◽  
Steel Cleanliness

scholarly journals Study of the Influence of Intermix Conditions on Steel Cleanliness

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 852 ◽  
Author(s):  
Branislav Bul’ko ◽  
Marek Molnár ◽  
Peter Demeter ◽  
Dana Baricová ◽  
Alena Pribulová ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Negative Impact ◽  
Cast Steel ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Chemical Compositions ◽  
Negative Effect ◽  
Type Size ◽  
Steel Cleanliness ◽  
Steel Grades

Modern steel plants produce today a large portfolio of various steel grades, many for end-uses demanding high quality. In order to utilize the maximum productivity of the continuous-casting machine, it is sometimes necessary to cast steel grades with different chemical compositions in one sequence. It is important, therefore, to know the possibilities of a specific continuous-casting machine to make the Intermix connections as short as possible. Any interference with established procedures may, however, have a negative impact on the cleanliness of the cast steel. Using physical and numerical simulation tools, it was found that reducing the steel level in the tundish during the exchange of ladles makes it possible to shorten the transition zone. However, when the steel level is reduced, the flow of steel is impaired, which can have a negative effect on the cleanliness of the cast steel and, in extreme cases, may even lead to entrapment of slag in the mold. The cleanliness of cast steel was evaluated using one of the most advanced tools for automatic steel cleanliness evaluation, AZtecFeature (Oxford Instruments, Abingdon, UK), which enables determination of the type, size, distribution, and shape, as well as the chemical composition, of individual types of non-metal inclusions.

scholarly journals Investigation of Fluid Flow and Steel Cleanliness in the Continuous Casting Strand

2007 ◽  
Vol 38 (1) ◽  
pp. 63-83 ◽  
Author(s):  
LIFENG ZHANG ◽  
SUBO YANG ◽  
KAIKE CAI ◽  
JIYING LI ◽  
XIAOGUANG WAN ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Continuous Casting ◽  
Steel Cleanliness

Properties of ZrO2-C Materials with Anti-Oxidants

2010 ◽  
Vol 156-157 ◽  
pp. 996-999 ◽  
Author(s):  
Guo Qi Liu ◽  
Hong Xia Li ◽  
Fan Qian ◽  
Wen Gang Yang ◽  
Jian Bin Yu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Continuous Casting ◽  
Bulk Density ◽  
Submerged Entry Nozzle ◽  
Apparent Porosity ◽  
Mold Slag ◽  
Slag Line ◽  
Excellent Corrosion Resistance

Submerged Entry nozzle is one of the key functional refractories for continuous casting and the safe and efficiency of the continuous casting is directly influenced by the properties of ZrO2-C materials located at the slag line of the submerged entry nozzle. In general, a little anti-oxidants such as SiC, Si or B4C will be introudced into ZrO2-C materials and anti-oxidants also influence the corrosion resistance of ZrO2-C materials. So this paper researched the properties especially the corrosion resistance of ZrO2-C materials with SiC, Si or B4C additions. The results show that the properties of ZrO2-C materials are relate to the composition of ZrO2-C materials and the corrosion resistance of ZrO2-C materials have no obvious relationship with other properties such as apparent porosity, bulk density, et al. The addition of anti-oxidants will all decrease the corrosion resistance of ZrO2-C material. The decreasing degree of corrosion resistance by Si is the most and the decreasing degree of corrosion resistance by SiC is the least. The corrosion resistance of ZrO2-C material with B4C addition is relate to the kind of the mold slag. To obtain the ZrO2-C material with excellent corrosion resistance antioxidants should not be added into ZrO2-C materials.

scholarly journals Mechanism of Floater Formation in the Mold during Continuous Casting of Ti-Stabilized Austenitic Stainless Steels

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 635 ◽  
Author(s):  
Zhuo Chen ◽  
Min Li ◽  
Xufeng Wang ◽  
Shengping He ◽  
Qian Wang
Keyword(s):  
Continuous Casting ◽  
Stainless Steels ◽  
Mold Flux ◽  
Surface Defects ◽  
Austenitic Stainless Steels ◽  
Coordinated Control ◽  
Bearing Steel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mold Slag

During the continuous casting (CC) of Ti-bearing steel, a steel lump can solidify in the mold (i.e., floater steel) more easily than in the Ti-free steels. This causes severe surface defects or even a breakout. We have examined the mechanisms of floater formation during the CC of 321 stainless steel by analyzing the inclusions in the floater steel and in the 321 steel that was sampled from the mold. Additionally, we calculated the disregistry between the metallic phases and common inclusions. The mineralogy and morphology of the inclusions were examined while using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). Thermodynamic calculations on the TixOy inclusions at different oxygen potentials were performed while using FactSage 7.2. Using this approach, we determined that ferrite nucleates grow on TiN and MgO inclusions following solidification, which then form micro-aggregates as a result of dynamic collisions and alliances. Analysis of the mold slag from the metallurgy stage indicated that altering the basicity and properties of the mold flux systematically might minimize the reaction between the slag and steel, which would achieve a coordinated control over lubrication and heat transfer.

scholarly journals The Spontaneous Emulsification of Entrained Inclusions During Casting of High Aluminum Steels

2021 ◽  
Author(s):  
Akalya Raviraj ◽  
Nadia Kourra ◽  
Mark A. Williams ◽  
Gert Abbel ◽  
Claire Davis ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Slag Phase ◽  
Continuous Caster ◽  
Casting Process ◽  
Inclusion Size ◽  
Confocal Scanning Laser Microscopy ◽  
Continuous Casting Mold ◽  
Spontaneous Emulsification ◽  
Mold Slag ◽  
High Aluminum

AbstractMold slag entrainment during the continuous casting process presents a late stage source of non-metallic inclusions (NMI) with a high likelihood of ending up in the final product. The reaction between the entrained slag phase and surrounding liquid steel in the continuous casting mold affects the inclusion morphology and properties. However, there is a lack of information on the kinetics of the NMI-steel reaction. A novel approach, utilizing controlled synthetic inclusion/metal samples, has been developed to study the reactions between free inclusion-slag droplets and steel. The technique combines High-Temperature Confocal Scanning Laser Microscopy (HT-CSLM), X-ray Computed Tomography (XCT) and advanced electron microscopy techniques offering rapid controlled heating performance and extensive characterization of the samples. This method offers the ability to observe the size, shape and composition of an unconstrained reacting inclusion and to investigate the interface between the materials with respect to reaction time. This study interrogates a low aluminum steel (0.04 wt pct) and a high aluminum steel (1 wt pct) in contact with an inclusion-slag phase with a starting composition aligned to a typical mold slag. It was found that the reaction between silica and aluminum across the interface of the two phases provided a driving force for spontaneous emulsification to occur. Products of such emulsification will have a significant effect on the inclusion size distribution and potentially the prevalence of inclusion retention in molten steels solidifying in the continuous caster (for example if emulsified buoyancy forces are reduced to near zero) and hence in the subsequent solid product.

Study of Non-Newtonian Behavior of CaO-SiO2-Based Mold Slag and Its Effect on Lubrication in Continuous Casting of Steel

2019 ◽  
Vol 50 (2) ◽  
pp. 1052-1059 ◽  
Author(s):  
Xiaobo Yan ◽  
Meijuan Gan ◽  
Huazhi Yuan ◽  
Qiangqiang Wang ◽  
Shengping He ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Continuous Casting Of Steel ◽  
Mold Slag ◽  
Newtonian Behavior
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