SU818732A1 - Intensifyer of steel boiling in ingot mould - Google Patents

Description

rum 15-45 mm. Such pressures provide sufficient strength for the briquette and exclude operations in their area. If necessary, long-term storage and transportation, in order to impart special strength to briquettes, it is possible to introduce into the composition of charge materials binders in the amount of 0.5-2.5% (in excess of 100%) according to commonly accepted methods.

The shape and size of the granules are determined from the need to ensure uniform loading during pressing throughout their volume, which allows to develop pressure on each square centimeter up to 1.5 tons and to exclude the usually existing calcining. The exclusion from the technological process of firing operations, in turn, allows the introduction of gaseous coals with a content of 32-44 weight into the composition of the intensifier instead of fluorine-containing components. % of volatile components.

Some compositions of briquette intensifiers of steel boiling in a mold are given in table. one.

Table I

Characteristics of briquettes-intensifiers

Scale is introduced into the briquette as an oxidizer of both carbon dissolved in steel and carbon contained in gaseous coal. The result of their interaction is the formation of carbon monoxide, which causes steel to boil in the mold. A similar boiling effect occurs when soda ash is decomposed into carbon dioxide and oxide

on three . The latter, in turn, interacts with oxides formed during the decomposition of gaseous coals and exogenous and endogenous oxides in liquid steel, fluxes them to form liquid low-melting products, which promotes their removal from the treated metal and improves its purity by non-metallic inclusions m. significant amount

The volatile components found in gaseous coal promotes the rapid dissolution of the briquette and causes intense boiling of the metal in the mold due to their discharge. The carbon of the gas coals, interacting with oxygen m of steel and scale, forms carbon monoxide, which also causes boiling of steel and a decrease in its oxygen content. Volatile components released from gas coals are deposited on the walls of the molds and help to improve the quality of the ingot surface and in some cases make it possible to avoid painting the molds. However, as was established in the process of preliminary studies, gas coals with a content of 32-44 weight are the most optimal. % of volatile components. At their lower contents, slow decomposition of briquettes is observed and, as a result, insufficiently effective boiling of the metal in isolol is observed. When the content of volatile components in gas coal is more than 44 wt. %, on the contrary, there is a rapid decomposition of the briquette and

its components do not have time to join table 2

Static full interaction with liquid steel, which also reduces the effect of its processing.

Therefore, the optimal accepted content of volatile components in the range of 32-44 weight. %

Intensification briquettes were tested when casting boiling steel grades of the Yukp and 15kp type into ingots weighing 7.8 and 8.8 tons through a 50 mm beaker. The briquettes were injected into the mold after being formed on the bottom of the metal cushion. The consumption of briquettes was 0.35 kg / t steel. At the end of the filling of the mold with metal, the ingots were sealed with water according to the technology adopted at the plant.

The information on testing of briquettes-intensifiers for boiling steel in a mold is summarized in Table. 2

As follows from the above data, the most positive results when testing the claimed compositions of briquette synthesizing agents were obtained using compositions No. 2-8.

The use of this intensifier makes it possible to improve the sanitary and hygienic conditions during its manufacture and use, and also improves the quality. It reduces the cost of

surface ingots processing.

Claims (2)

1.Boxing steel booster in a mold, containing oxalite scale and carbon-containing materials, characterized in that, in order to ensure high quality of the ingot surface, it additionally contains gas coal, the following ratio of components, weight. %: Dross 52,5-77,5 Soda Ash 2.5-10.5 Coal15-40 2. An intensifier according to claim 1, characterized in that it contains gas coals with a weight of 32-44. % volatile components. Sources of information taken into account in the examination 5 1. USSR author's certificate No. 212297, cl. In 22D 7/00, 1966. 2. USSR author's certificate No. 270196, cl. In 22D 7/00, 1966.