Sliding nozzle plate and sliding nozzle device using the same
a technology of sliding nozzle and nozzle device, which is applied in the field of sliding nozzle plate, can solve the problems of molten metal penetration into the joint, damage to the surface of the sn plate used in the sn device, and damage to the sn plate defining the through-hole for allowing molten metal to pass through, etc., and achieves the effect of increasing the displacement resistance of the tubular member 3 and increasing the bonding surfa
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example a
[0043]In Example A, an influence of each dimension of a composite SN plate on displacement of a tubular member used therein, and molten metal penetration into a joint between the tubular member and a SN plate body, was analyzed. A result of the analysis is illustrated in Table 1. A composite SN plate in Example A was used as a lower plate of a SN device for a ladle. The composite SN plate was made of a conventional alumina-carbon based material.
TABLE 1InventiveInventiveInventiveInventiveInventiveComparativeComparativesample 1sample 2sample 3sample 4sample 5example 1example 2φB: Diameter (mm) of diametrally-150175180130130182130enlarged through-holeφI: Outer diameter (mm) of flangs of185185185140140185140tubular memberφR: Outer diameter (mm) of non-flange148173178128126180124portion of tubular memberφD: Inner diameter (mm) of tubular90909080809080memberSatisfaction of conditional formula (1)◯◯◯◯◯X◯(φB ≦φI − 5)*1Satisfaction of conditional formula (2)◯◯◯◯◯◯X(φB −φR ≦ 4)*1Observed abno...
example b
[0045]In Example B, in a SN plate where a recycled SN plate obtained by recycling a used SN plate is used as a SN plate body, an influence of a boring width of a through-hole (nozzle hole) of the used SN plate on a recyclability rate of used SN plates was analyzed.
[0046]The recyclability rate was evaluated in the following manner. A through-hole (nozzle hole) of a used SN plate was diametrally enlarged by means of boring. In a bore surface of the diametrally-enlarged through-hole, a region in an angular range of 90 degree on a leading side of a sliding movement in an opening stroke direction (range indicated by A in FIG. 4) was observed. Then, a sample having no open crack was evaluated as “recyclable”. Specifically, a crack having a gap of 0.5 mm or more was determined to be an open crack. This is because, as long as a crack has a gap of less than about 0.5 mm, the molten metal penetration will never occur, even if molten steel contacts the crack. The above operation was performed ...
example c
[0048]In Example C, a plurality of types of recycled lower plates were prepared by changing a type of mortar (bonding material) to be formed as the joint 4 between the tubular member 3 and the SN plate body in the recycled lower plate 2 illustrated in FIG. 1(b). Then, each of the plurality of types of recycled lower plates was used as a lower plate of a SN device as illustrated in FIG. 2, and compared to an unused lower plate, in terms of usable life. In all of the samples, a width of the joint was set to 2 mm.
[0049]A result of the comparison is illustrated in Table 2. In Table 2, the usable life non-attainment rate represents a rate of samples failing to attain the same usable life as that in an unused lower plate. In each of the samples, the number of tests to be assigned to the denominator was 100.
TABLE 2Inventive sample 6Inventive sample 7Inventive sample 8Inventive sample 9Type of mortarmetal Al + phenolicmetal Al + phenolicmetal Al + phenolicliquid glass basedresin based morta...
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