Casting rimmed and semikilled steel using nozzles with a modified channel cross section

Перегудов, А. С.; Evtushenko, V. B.; Didkovskii, V. K.; Kulikov, I. V.; Mikhnevich, Yu. F.; Cherkaev, E. N.; Pirogov, V. F.; Tol'skii, A. A.; Kamchatnyi, G. A.; Orobtsev, Yu. V.; Volokhovskii, A. V.; Gretskii, A. A.

doi:10.1007/bf01093969

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“…Teeming of steel through nozzles and collector-nozzles with lobed [5], cross-shaped [6], and square [7] channel cross sections and in the form of an ellipse and a portion of a circle [8,9] makes it possible to reduce Ef and scrap of metal for surface defects.…”

Section: %)mentioning

confidence: 99%

Unfired periclase and periclase-graphite nozzles, collector-nozzles, and inserts for teeming of steel

Simonov

1987

Refractories

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The quality of ladle nozzles and collector-nozzles and the form and dimensions of their discharge channels influence the number of heats of steel teemed with a single set of refractories and the stability of the stream of molten metal.Periclase nozzles are prone toward clogging of the channels, which is responsible for the need of burning out of them with oxygen, disturbance of normal teeming, and poorer ingot quality.A method for unfired periclase--graphite nozzles and collector-nozzles with a lignosuifonate binder [i], the channels of which are almost completely free of clogging with normal teeming without burning out with oxygen, has been developed. The production of such refractory parts has been introduced on a specially developed production line at Magnesite Combine which includes delivery and measuring out of the graphite, preparation of the mixture in mills~ pressing on hydraulic presses, and drying in tunnel dryers. If necessary paraffin impregnation of the parts is possible. Their properties satisfy the requirements of Technical Specification 14-8-385--81 for type PGRBS nozzles and collector-nozzles. Their compressive strength is 17-30 N/mm 2, open porosity 10-18%, and apparent density 2~ g/cm 3. The MgO content in these parts is 90.1-93.2 wt.% and the C 3.5-8,3 wt.%. The external appearance of nozzles and collector-nozzles of various types and sizes is shown in Fig. i.The unfired periclase--graphite nozzles and collector-nozzles have found wide use in teeming steel by the progressive method of through slide gates [2]. In slide gates the nozzles may provide teeming of more than one heat in succession and the collector nozzles basically only of a single heat. These parts are used for teeming of more than 2/3 of the volume of steel teemed in the country through slide gates.For the purpose of increasing the strength of the parts and providing teeming of two heats a method for unfired collector-nozzles with a phosphate binder has been developed [3].Sintered periclase powders, graphite, commercial grade alumina, and sodium polyphosphate are used as the original materials. The density of the sodium po!yphosphate solution is 1.50 g/cm 3 and the quantity of it 7-9%. The use of sodium polyphosphate makes it possible to use periclase powders with an increased calcium oxide content, which in service are combined in the refractory compound NaCaP04 (tmelt ~ 1760~In preparation of the mixture in mixing mills the graphite is uniformly distributed in the dispersed binder of the collector-nozzles (Fig. 2). The characteristics of the unfired periclase--graphite collector nozzles with a Magnesite Combine.

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Section: %)mentioning

confidence: 99%

Unfired periclase and periclase-graphite nozzles, collector-nozzles, and inserts for teeming of steel

Simonov

1987

Refractories

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Casting rimmed and semikilled steel using nozzles with a modified channel cross section

Cited by 1 publication

References 0 publications

Unfired periclase and periclase-graphite nozzles, collector-nozzles, and inserts for teeming of steel

Unfired periclase and periclase-graphite nozzles, collector-nozzles, and inserts for teeming of steel

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