SU1183294A1 - Packing mixture for slide gate bucket sleeve method of heating high-speed steel for hot deformation - Google Patents

Abstract

SEALING MIXTURE FOR THE KNIFE GLOBE GRAVITIC GLASS, including quartz sand, a technological additive, characterized in that, in order to reduce the content of non-metallic inclusions in the metal of the ingot by reducing the intensity of formation formation in the casting channel, the quality ratio of the matrices will be used. in the following ratio of ingredients, wt.%: Quartz sand 90-95 Cerium fluoride 5-10 (L C

Description

The invention relates to metallurgy and can be used in the repeated casting of alloyed steels from ladles through slide gates.

The purpose of the invention is to reduce the content of non-metallic inclusions in the metal of the ingot due to a decrease in the intensity of formation in the casting channel,

 Cerium fluoride is an inhibitor that inhibits the interaction of alloying elements.

- steels, with oxides contained in the refractory materials of the slide gate channel. As a result of the high temperature of the steel on the fluoride, the formed cerium, due to its high affinity for oxygen, itself interacts with the oxides of the refractory surface, which becomes large inert with respect to the alloyed elements of the cast steel, which contributes to a significant reduction in the number of refractory new formations on the channel walls in the form of nasty.

For the preparation of the compaction mixture, cerium fluoride is used, ground to fractions not exceeding

0.09 mm. When the content of cerium fluoride in an amount less than 5 wt.%, There is no effect of reducing the intensity of the formation of oxidation. Increase

cerium fluoride content beyond 10 May. % does not lead to a further decrease in the intensity of formation,

Table 1 shows the compositions of the known (composition 1) and the proposed (compounds 2-4) mixtures, as well as the compositions of the sealing mixture (compounds 5 and 6) with cerium fluoride in an amount greater and smaller than that proposed.

The mixture is prepared by thoroughly mixing in a mixer of dry calcined quartz sand with a grain size of less than 1 mm with ground powder (fraction less than 0.09 mm) of cerium fluoride. Pour the ladle glass cavity with the prepared mixture with the slide gate closed, before feeding the ladle for smelting.

Testing of sealing mixtures is carried out when casting ShH15 steel from buckets with a capacity of 90 tons by siphon method into molds using magnesite glass and mullite-corundum plates and a glass collector in the slide gates. The launch of the metal jet at the beginning of casting is carried out by opening the slide gate without burning the channel with oxygen or using any mechanical means.

When founding steel, the time of formation of an annular nastiral of 10 mm height at the lower end of the glass-collector at the outlet of the metal stream is recorded and the rate of increase is measured when pouring four heats through a set of refractories on 1-5 bushes. Steel is poured at 1540 ° C,

Table 2 shows the rate of calcification when casting one of the bottoms using various compaction mixtures (Table 1), and c. Table 3 — the number of non-metallic inclusions in steel G15, obtained by casting two heats using the known (composition 1) and proposed (compositions 2-4) sealing mixtures,

From Tables 2 and 3 it follows that the use of the proposed compaction mixture both causes a decrease in the rate of deposition by an average of 1.8 times and a decrease in the content of oxides in the metal of the ingot, 5 times in comparison with similar indicators when using a known mixture.

Thus, the decrease in the content of nonmetallic inclusions in the metal: the casting is achieved by reducing the intensity of nasloobrazovanie in the filling channel of the sliding gate.

Table 1

table 2

Claims (1)

SEALING MIXTURE FOR A LATERAL VALVE OF A GATE VALVE, including quartz sand, a technological additive, characterized in that, in order to reduce the content of non-metallic inclusions in the metal of the ingot due to a decrease in the rate of deposit formation in the casting channel, the mixture contains cerium fluoride as the technological additive in the following ratio , wt.%: Quartz sand 90-95 Cerium Fluoride 5-10 1 1183294 2