Development of a new mold oscillation mode for high-speed continuous casting of steel slabs.

Suzuki, Mikio; Mizukami, Hideaki; Kitagawa, Toru; Kawakami, Kiminari; Uchida, Shigetaka; Komatsu, Yoshimi

doi:10.2355/isijinternational.31.254

Cited by 94 publications

(89 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…8. 33) Both the observed and the predicted frictional force are adopted at the maximum relative speed between the mold oscillating speed and the casting speed. Accordingly, the frictional force calculated from Eq.…”

Section: Upper Limit Of Casting Speed Of Continuous Castermentioning

confidence: 99%

Perspectives of Research on High-speed Conventional Slab Continuous Casting of Carbon Steels.

Suzuki

Nakada

2001

ISIJ International

Self Cite

View full text Add to dashboard Cite

Two decades ago the casting speed of the conventional slab continuous caster was increased stepwise to a level over 2 m/min. Henceforth, the casting speed has been remained a similar level. In this review the reasons for constraining the casting speed are discussed. As a result the constraints of the high-speed casting are thought mold powder entrapment and longitudinal facial crack occurring in high-speed casting.Some measures to prevent the mold powder entrapment and the longitudinal facial crack are discussed. Resultantly the research issues we should develop are considered such as prevention of alumina built-up in a submerged entry nozzle, control of fluid flow in a mold and control of heat transfer through mold powder film interved between a solidifying shell and a mold wall. They are most important to realize the high-speed continuous casting of conventional slab.KEY WORDS: high-speed casting; conventional slab; mold powder entrapment; longitudinal facial crack; upper limit of casting speed.order to realize the ideal process, i.e., full hot direct rolling, technologies for more stability of the casting practice and the production of higher slab quality should be realized.The casting speed of the conventional slab caster with an oscillating mold has been remained a 2 m/min level because such higher-speed casting deteriorates slab quality. Therefore, we will investigate what the factors for restraining the casting speed of the conventional slab caster are. Present State of High-speed Continuous Casting of Steel Slab Trend of Casting Speed of Conventional SlabContinuous Caster We will survey the present state of high-speed casting in a conventional slab caster. The trend of the casting speed is shown in Fig. 3 10) for the conventional slab casters in Japanese steel companies. The main specifications and the casting speed are listed in Table 1 of the conventional slab casters. [11][12][13][14][15][16][17][18] The casting speed has been stepwise increased and attained approximately twice in two decades. Fifteen years ago a synchronized operation began between a continuous caster and a hot strip mill, i.e., hot direct rolling. 19) Since the hot direct rolling operation needs the productivity of the caster to be met to that of the hot strip mill, the casting speed should be increased. Heat Transfer and Lubrication Phenomena inContinuous Casting Mold at High-speed Casting The infiltration of liquid powder into a shell/mold gap is a very important process in continuous casting since it is necessary to ensure both good lubrication and uniform heat transfer between a shell and a mold. Failure to provide these conditions could result in the creation of surface defects and sticker breakouts.We will survey the heat transfer and the lubrication phenomena in a mold at a casting speed over 2 m/min of slab casters.Local heat flux in casting of low carbon Al killed steel is shown in Fig. 4 20) against the remaining time in a mold. The local heat flux during the conventional slab casting given by Suzuki et al.,21) and Grilles...

show abstract

Section: Upper Limit Of Casting Speed Of Continuous Castermentioning

confidence: 99%

Perspectives of Research on High-speed Conventional Slab Continuous Casting of Carbon Steels.

Suzuki

Nakada

2001

ISIJ International

Self Cite

View full text Add to dashboard Cite

show abstract

“…The figures themselves need a physical explanation. As stated in the introduction, also (Suzuki et al, 1991), (Araki & Ikeda, 1999), increasing τ reduces peak friction as also the depth of oscillation marks. Thus τ contributes negatively to these circles.…”

Section: Oscillation Performance Metricsmentioning

confidence: 96%

“…Only the oscillation frequency f and amplitude a or s (stroke; s = 2a) are available. Suzuki and others (Suzuki et al, 1991) showed that the waveform could also be varied from the sinusoidal towards the saw-tooth form with gainful effects. Slower…”

Section: Introductionmentioning

confidence: 99%

Optimization of Oscillation Parameters in Continuous Casting Process of Steel Manufacturing: Genetic Algorithms versus Differential Evolution

Bhattacharya¹,

Sambasivam²

2009

Evolutionary Computation

View full text Add to dashboard Cite

“…Uma delas possivelmente de alumina (1) e outra um complexo de alumina e zircônia (2). Os resultados obtidos mostram que as técnicas desenvolvidas fornecem informações confiáveis para a otimização dos parâmetros de oscilação do molde.…”

Section: Tempo De Estripamento Negativo [S]unclassified

Avaliação Do Efeito Da Oscilação Do Molde Sobre a Qualidade De Placas

Reis¹,

Cunha²,

Mendonça³

2017

Anais Do Seminário De Aciaria, Fundição E Metalurgia De Não-Ferrosos

View full text Add to dashboard Cite

ResumoA solidificação do aço no molde é determinante para a qualidade superficial da placa, considerando que os principais defeitos tendem a se formar nos primeiros estágios de formação da pele. Assim, diversos parâmetros do processo que afetam a solidificação no molde devem ser considerados e um deles é a oscilação do molde. A partir de amostras da face estreita de placas obtidas no processo industrial, duas técnicas para avaliar o efeito da oscilação foram desenvolvidas com base em perfilometria a laser e metalografia. Em relação à perfilometria a laser, desenvolveuse um método de análise da profundidade das marcas de oscilação. Foi comprovada a correlação da profundidade média dessas marcas com o tempo de estripamento negativo. A segunda técnica refere-se ao ataque metalográfico à base de ácido pícrico, que se mostrou eficiente para visualização, via microscopia ótica, do gancho na base da marca de oscilação. Bolhas de argônio e partículas de pó fluxante podem ser aprisionadas na região do gancho de oscilação, e eventualmente ocasionar defeitos nos produtos laminados. O uso das técnicas apresentadas nesse estudo forneceu subsídios à tomada de ações visando a diminuição da profundidade do gancho e da marca de oscilação, resultando em melhoria da qualidade superficial das placas produzidas. Palavras-chave: Oscilação do molde; Profundidade da marca; Gancho de oscilação. EVALUATION THE EFFECT OF OSCILLATION MOLD ON SLAB QUALITY AbstractMold Steel solidification is very important for slab surface quality, considering that the main defect happens during the first stages of shell formation. Thus, many process parameters which influence mold steel solidification should be considered, and one of them is the mold oscillation. Samples of the narrow side of the slabs were obtained from the industrial process and two techniques were developed to evaluate oscillation effect laser perfilometry and mettallography. Regarding to laser perfilometry, it was developed an analysis method of oscillation mark depth. It was proven the correlation of the average oscillation mark depth with the negative strip time. The second technique regards to metallography etching based on picric acid, which showed useful to view, by optical microscopy, the hook at the base of oscillation mark. Argon bubbles and flux particles can be captured at oscillation hook region, and eventually cause defects on rolled products. The use of techniques presented in this study provided subsidies for decision making aiming the reduction of oscillation mark depth and hook, resulting in surface quality improvement of slabs produced.

show abstract

Development of a new mold oscillation mode for high-speed continuous casting of steel slabs.

Abstract: High-speed oontinuous casting is a prerequisite for the successful operation of hot direct rolling (HDR)

Cited by 94 publications

References 0 publications

Perspectives of Research on High-speed Conventional Slab Continuous Casting of Carbon Steels.

Perspectives of Research on High-speed Conventional Slab Continuous Casting of Carbon Steels.

Optimization of Oscillation Parameters in Continuous Casting Process of Steel Manufacturing: Genetic Algorithms versus Differential Evolution

Avaliação Do Efeito Da Oscilação Do Molde Sobre a Qualidade De Placas

Contact Info

Product

Resources

About