SU1614890A1 - Method of high-speed casting of steel - Google Patents

Abstract

The invention relates to ferrous metallurgy, in particular to the rapid casting of metal into molds. The purpose of the invention is to accelerate the filling of the mold and reduce the overgrowth of the hole in the pouring glass. The method of high-speed casting of steel mainly into molds with heat-insulating plates and wedges includes pouring the mold with an intensity of 80-180 kg / s to a level of 5-20% of the height of heat-insulating plates from their lower end, and then refilling in two steps, the first of which is carried out with an intensity of 5-10 kg / s for 4-8 s. 1 tab.

Description

 The invention relates to ferrous metallurgy, in particular, to the rapid casting of metal into setters, and can be used in the preparation of ingots in molds, mainly with heat insulating plates and wedges.

The purpose of the invention is to accelerate the filling of the mold and reduce the overgrowth of the hole of the pouring glass.

The essence of the method is as follows.

In molds with insulating plates fixed with wedges, steel is poured at an intensity of 80–180 kg / s to a level of 5–20% of the heat of the heat sink from their lower end. Then the liquid metal is refilled in two steps. First, with an intensity of 5-10 kg / s for 4-8 s, then until the mold is filled with an intensity of 50-70 kg / s.

If the intensity of the first intake of refilling is less than 5 kg / s, the acceleration of filling the molds is not achieved, and consequently, a decrease in the casting time of the melting. - an oxygen tube.

If the intensity of topping is more than 10 kg / s, then the number of surfaced heating mats increases due to an increase in the intensity of the melt flows and: softening of the hardening crust.

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There is also no complete solidification of the melt that has fallen into the gap by the plate and mold.

If the duration of the initial, topping-up is less than 4 s, then at a minimum intensity of 5 kg / s, the number of splashes of heat increases, and the head is cut. I If the duration of refilling with the initial intensity is more than 8 s, then at a casting intensity of 10 kg / s, the channel of the steel-breaking glass. will begin to overgrow and the channel will need to be burned with an oxygen tube. Reducing the intensity of the second intake topping up less than 50 kg / s unacceptably increases the duration of filling the molds with an intensity | TI of the initial filling up of 10 kg / s. I If the intensity of the subsequent idol is more than 70 kg / s, then the growing hydrostatic pressure crushes the hardened crust of the metal under the heat plate and the number of heat particles that grow afterwards increases,

Example. The 140-ton smelting of the quiet steel Stzsp is poured into 8-ton molds, which are wider downwards. In the head part of the molds, it is fixed with the help of refractory wedges of a 490 mm heat plate. The intensity of steel casting is maintained at around 90 kg / s, the intensity of the initial topping up - 8 kg / s for 6 s and the final topping up - 60 kg / s. The casting of the smelting takes place without noticeable overgrowing of the steel teeming glass, e

it is necessary to burn a hole with an oxygen tube. There is not a single case of surface heat. The casting time of melting is 34 minutes, which is 2 minutes less than by a known method.

Technical and economic indicators of casting for various values of casting parameters are given in the table.

The proposed method of high-speed casting of steel makes it possible to reduce by 5-10% the duration of casting of the smelting, eliminate overgrowing of the steel casting without increasing the number of extra hot plates and further increasing the head trim of the ingots. holes of steel teeming glasses, increases the capacity of the steel teeming span.

Claims (1)

Invention Formula I The method of high-speed punching of steel from above mainly into molds with heat insulating plates, including pouring molds with an intensity of 80-180 kg / s to a level of 5-20% of the height of heat insulating plates from their lower end, and the subsequent and with the fact that, in order to speed up the filling of the mold and reduce the overgrowing of the hole of the pouring glass, the refilling is carried out in two steps, the first of which is carried out with an intensity of 5-10 kg / s for 4-8 s.