Crossflow Characteristics of an Oscillating Jet in a Thin Slab Casting Mould

1999 ◽  
Vol 121 (3) ◽  
pp. 588-595 ◽  
Author(s):  
Nicholas J. Lawson ◽  
Malcolm R. Davidson
Keyword(s):  
Casting Rate ◽  
Water Model ◽  
Internal Diameter ◽  
Thin Slab ◽  
Thin Slab Casting ◽  
Mould Wall ◽  
Slab Casting ◽  
Oscillating Jet ◽  
Crossflow Velocity ◽  
Gap Width

The application of LDA to a transient 1/3 scale (500 mm wide) water model of a mould, typical of steel thin slab casting, is presented. The characteristics of a crossflow, associated with the oscillating jet emerging from a submerged nozzle (internal diameter 33 mm), were analyzed for a range of casting rates (0–2 m/min), nozzle submergences (20–120 mm) and nozzle-mould wall gap widths (0–21 mm). The frequency of oscillation was found to be primarily dependent on the casting rate of the system, independent of nozzle submergence or gap width, whereas the RMS crossflow velocity depended on all three parameters. Additional crossflow was also observed past the jet below the nozzle exit and this allowed the jet to oscillate even with zero gap width.

Oscillatory Flow in a Physical Model of a Thin Slab Casting Mould With a Bifurcated Submerged Entry Nozzle

2002 ◽  
Vol 124 (2) ◽  
pp. 535-543 ◽  
Author(s):  
Nicholas J. Lawson ◽  
Malcolm R. Davidson
Keyword(s):  
Free Surface ◽  
Flow Visualization ◽  
Flow Pattern ◽  
Oscillatory Flow ◽  
Submerged Entry Nozzle ◽  
High Energy ◽  
Water Model ◽  
Thin Slab ◽  
Thin Slab Casting ◽  
Slab Casting

Laser Doppler anemometry (LDA) measurements are presented of the oscillatory flow in a 33% scale water model of thin slab casting mould when the flow enters as two lateral jets through a bifurcated nozzle. The submerged entry nozzle (SEN) and the mould were geometrically scaled to be representative of industrial thin slab casters. Mean and RMS LDA velocity measurements were taken at three selected points in the region surrounding the SEN, at 500 points in the central plane parallel to the broad face of the mould, and at points in selected transverse sections, for casting rates up to 1.53 m/min. Flow visualization was also taken at two selected planes in the mould. The LDA results showed each jet to form an upper and lower recirculation zone with the lower zones adjacent to one another bounded by the jets and the mould walls and the upper zones bounded by the jet, the SEN, the mould walls and the free surface. Both jets were found to have most oscillatory energy at frequencies below 5 Hz with high energy low frequency modes occurring at frequencies below 0.2 Hz. However, no single dominant frequency occurred in the spectrum and flow visualization revealed an apparently chaotic flow pattern in the oscillation. Midpoint jet deflection was restricted to 6–8 mm RMS, and no coherence was observed between jet (and free surface) movements on either side of the mould. The time averaged flow pattern was found to be almost symmetric across the wide face of the mould. It is concluded that both shear layer instability in the impinging jets, and deflection of the jets due to cross-flow at the SEN-mould wall, contribute to the flow oscillation.

scholarly journals Primary Recrystallization Behaviors of Hi-B Steel with Lower Initial Nitrogen Produced by the Thin Slab Casting and Rolling Process

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 189
Author(s):  
Bing Fu ◽  
Li Xiang ◽  
Jia-Long Qiao ◽  
Hai-Jun Wang ◽  
Jing Liu ◽  
...  
Keyword(s):  
Grain Size ◽  
Electron Microscope ◽  
Nitrogen Content ◽  
Rolling Process ◽  
Primary Recrystallization ◽  
Thin Slab ◽  
Nitriding Temperature ◽  
Thin Slab Casting ◽  
Slab Casting ◽  
Inhomogeneity Factor

Based on low-temperature high-permeability grain-oriented silicon steel designed with an initial nitrogen content of 0.0055% and produced by the thin slab casting and rolling process, the effect of total nitrogen content and nitriding temperature on primary recrystallization microstructure and texture were studied by optical microscope, scanning electron microscope, transmission electron microscope, and electron backscatter diffraction. The nitriding temperature affects the primary recrystallization behaviors significantly, while the total nitrogen content has a small effect. As the nitriding temperature is 750–850 °C, the average primary grain size and its inhomogeneity factor are about 26.58–26.67 μm and 0.568–0.572, respectively. Moreover, the texture factor is mostly between 0.15 and 0.40. Because of the relatively sufficient inhibition ability of inherent inhibitors in a decarburized sheet, the nitriding temperature (750–850 °C) affects the primary recrystallization microstructure and texture slightly. However, as the nitriding temperature rises to 900–950 °C, the average primary grain size and its inhomogeneity factor increase to 27.75–28.26 μm and 0.575–0.578, respectively. Furthermore, because of the great increase on the area fraction of {112} <110> grains, part of texture factor is increased sharply. Therefore, in order to obtain better primary grain size and homogeneity, better texture composition, and stability of the decarburized sheet, the optimal nitriding temperature is 750–850 °C.

Numerical Investigation of Shell Formation in Thin Slab Casting of Funnel-Type Mold

2014 ◽  
Vol 45 (3) ◽  
pp. 1024-1037 ◽  
Author(s):  
A. Vakhrushev ◽  
M. Wu ◽  
A. Ludwig ◽  
Y. Tang ◽  
G. Hackl ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Shell Formation ◽  
Thin Slab ◽  
Thin Slab Casting ◽  
Slab Casting

scholarly journals Case study of severe strip breakage in rolling mill of Thin Slab Casting and Rolling (TSCR) shop of TATA Steel, Jamshedpur

2016 ◽  
Vol 5-6 ◽  
pp. 15-22 ◽  
Author(s):  
Diptak Bhattacharya ◽  
Avinash Mishra ◽  
Ganga Prasad Poddar ◽  
Siddhartha Misra
Keyword(s):  
Rolling Mill ◽  
Thin Slab ◽  
Thin Slab Casting ◽  
Slab Casting

scholarly journals THIN SLAB CASTING AND ROLLING WHEN PRODUCING STEEL PLATES FOR WELDED PIPES ON A CONTINUOUS CASTING AND ROLLING PLANT

2017 ◽  
Vol 15 (3) ◽  
pp. 31-36 ◽  
Author(s):  
Oleg S. Lehov ◽  
◽  
Aleksandr V. Mikhalev ◽  
Maxim M. Shevelev ◽  
Damir G. Bilalov ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Steel Plates ◽  
Thin Slab ◽  
Thin Slab Casting ◽  
Slab Casting ◽  
Rolling Plant
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