Continuous Casting of High-Alloy Steels

Kinoshita, Katsuo; Yoshii, Yutaka; Kitaoka, Hidenari; Kawaharada, Akira; Nishikawa, Hiroshi; Tanigawa, Osamu

doi:10.1007/bf03338406

Cited by 3 publications

(5 citation statements)

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“…The different grades of stainless steel that are continuously cast can be classified in terms of their microstructure as ferritic, martensitic, austenitic and duplex [2][3][4][5][6] which makes the processing more complex than that of plain carbon steel grades. Problems with respect to cleanliness, the depth and uniformity of oscillation marks, segregation and centerline porosity, surface and internal cracks and shape defects, such as longitudinal and transverse depressions, continue to plague the industry [6].…”

Section: Introductionmentioning

confidence: 99%

Shell Growth, Surface Quality and Mould Taper Design For High-Speed Casting of Stainless Steel Billets

Wang¹,

Walker²,

Samarasekera³

2000

Canadian Metallurgical Quarterly

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An industrial plant trial was conducted on an operating billet casting machine at a Canadian minimill to determine mould wall temperature profiles for different stainless steel grades, a range of casting speeds, mould flux types and oscillation frequencies. Samples of the billets cast at the trial were collected and process variables were recorded. An inverse heat-conduction model was utilized to determine mould heat flux from measured mould-wall temperatures. Mathematical models were utilized to investigate mould/billet interaction and mould taper using the heat flux as input. The results from plant measurements, mathematical models and billet sample evaluations were used to correlate mould thermal response with transverse and longitudinal depressions and oscillation-mark depths for austenitic and martensitic stainless steels.Résumé -On a effectué un essai en usine avec un appareil à couler les billettes, à un mini-moulin canadien. On a déterminé les profils de température des parois du moule en utilisant différentes catégories d'acier inoxydable, à différentes vitesses de coulée, avec divers types de flux de moule et diverses fréquences d'oscillation. On a ramassé des échantillons de billettes coulées lors des essais et l'on a enregistré les variables du procédé. On a utilisé un modèle inverse chaleur-conduction pour déterminer le flux de chaleur du moule à partir des mesures de température des parois du moule. On a utilisé des modèles mathématiques pour étudier l'interaction moule/billette et le rétrécissement du moule, avec le flux de chaleur comme donnée d'entrée. Les résultats des mesures en usine, des modèles mathématiques et de l'évaluation des échantillons de billettes ont servi à corréler la réponse thermale du moule avec les dépressions transverses et longitudinales ainsi qu'avec la profondeur des marques d'oscillation pour des aciers inoxydables austénitiques et martensitiques.

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Section: Introductionmentioning

confidence: 99%

Shell Growth, Surface Quality and Mould Taper Design For High-Speed Casting of Stainless Steel Billets

Wang¹,

Walker²,

Samarasekera³

2000

Canadian Metallurgical Quarterly

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“…[14] is just the reverse reaction of an universal formalism if one sums up Eqs. [4], [6], and [11], i.e., the dissolved reaction.…”

Section: Calculation Of Enthalpy For Dissolutionmentioning

confidence: 99%

“…The first is to use the mold flux with low basicity to inhibit the reduction rate of SiO 2 during the continuous casting (CC) process. [5][6][7] Obviously, it cannot overcome the instability of mold flux properties during CC process completely by this method. Furthermore, it also increases the difficulties to control the stable silicon content of high-Al AHSS.…”

Section: Introductionmentioning

confidence: 99%

Control of Crystal Morphology for Mold Flux During High-Aluminum AHSS Continuous Casting Process

Guo

Seo

Shi

et al. 2016

Metall Mater Trans B

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In the present manuscript, the efforts to control the crystal morphology are carried out aiming at improving the lubrication of lime-alumina-based mold flux for casting advanced high-strength steel with high aluminum. Jackson a factors for crystals of melt crystallization in multi-component mold fluxes are established and reasonably evaluated by applying thermodynamic databases to understand the crystal morphology control both in lime-alumina-based and lime-silica-based mold fluxes. The results show that Jackson a factor and supercooling are the most critical factors to determine the crystal morphology in a mold flux. Crystals precipitating in mold fluxes appear with different morphologies due to their different Jackson a factors and are likely to be more faceted with higher Jackson a factor. In addition, there is a critical supercooling degree for crystal morphology dendritic transition. When the supercooling over the critical value, the crystals transform from faceted shape to dendritic ones in morphology as the kinetic roughening occurs. Typically, the critical supercooling degrees for cuspidine dendritic transition in the lime-silica-based mold fluxes are evaluated to be between 0.05 and 0.06. Finally, addition of a small amount of Li 2 O in the mold flux can increase the Jackson a factor and decrease the supercooling for cuspidine precipitation; thus, it is favorable to enhance a faceted cuspidine crystal.

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“…Accordingly, orientation (relative to the principle direction of working), location (related to segregations originating from the solidification process) and preparation (cutting, machining and heat treatment) of these test pieces are essential. On the other hand, the basis for typical steel tensile strength prediction is its chemical composition [4][5][6][7], but contemporary models also involve solidification influences, including grain size and morphology [8][9][10], microstructure [8][9][10][11][12][13][14][15][16][17], macrostructure [8,10,12,15,18,19], chemical non-homogeneities segregations [6,7,[19][20][21][22][23] and casting defects [24,25]. The tensile strength researches are related mostly with individual steel grades, but also more general prediction models were developed [5,14,26].…”

Section: Introductionmentioning

confidence: 99%

“…Katsuo et al [23] studied crack sensitivities of continuously cast high-alloy and stainless steels related to segregations of sulfur and phosphorus. They conducted hot tensile tests and examined the fracture surface microscopically.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Continuous Casting Process of Hypoeutectoid Steel Grades Using Multiple Linear Regression and Genetic Programming—An Industrial Study

Brezočnik

Župerl

2021

Metals

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Štore Steel Ltd. is one of the major flat spring steel producers in Europe. Until 2016 the company used a three-strand continuous casting machine with 6 m radius, when it was replaced by a completely new two-strand continuous caster with 9 m radius. For the comparison of the tensile strength of 41 hypoeutectoid steel grades, we conducted 1847 tensile strength tests during the first period of testing using the old continuous caster, and 713 tensile strength tests during the second period of testing using the new continuous caster. It was found that for 11 steel grades the tensile strength of the rolled material was statistically significantly lower (t-test method) in the period of using the new continuous caster, whereas all other steel grades remained the same. To improve the new continuous casting process, we decided to study the process in more detail using the Multiple Linear Regression method and the Genetic Programming approach based on 713 items of empirical data obtained on the new continuous casting machine. Based on the obtained models of the new continuous casting process, we determined the most influential parameters on the tensile strength of a product. According to the model’s analysis, the secondary cooling at the new continuous caster was improved with the installation of a self-cleaning filter in 2019. After implementing this modification, we performed an additional 794 tensile tests during the third period of testing. It was found out that, after installation of the self-cleaning filter, in 6 steel grades out of 19, the tensile strength in rolled condition improved statistically significantly, whereas all the other steel grades remained the same.

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Continuous Casting of High-Alloy Steels

Cited by 3 publications

References 1 publication

Shell Growth, Surface Quality and Mould Taper Design For High-Speed Casting of Stainless Steel Billets

Shell Growth, Surface Quality and Mould Taper Design For High-Speed Casting of Stainless Steel Billets

Control of Crystal Morphology for Mold Flux During High-Aluminum AHSS Continuous Casting Process

Optimization of the Continuous Casting Process of Hypoeutectoid Steel Grades Using Multiple Linear Regression and Genetic Programming—An Industrial Study

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