SU1321755A1 - Method of rimming steel deoxidation - Google Patents

Abstract

The invention relates to ferrous metallurgy, in particular, to the process of deoxidation of boiling steel in a ladle. The purpose of the invention is to increase the yield of suitable steel. The method of deoxidizing boiling steel includes the addition of ferromanganese and aluminum to the ladle and the release of steel into it. As aluminum, slag of secondary aluminum production is set at a mass ratio of the deoxidizing components of ferromanganese and slag of secondary aluminum production 1: 0.2-1: 1 with a total consumption of a mixture of 1-3 kg / t of steel, and ferromanganese is added to fractions of 0.002 - 0.003 m. The joint input of ferromanganese and slag from the production of recycled aluminum provides for the creation of a metal bucket skirt on the surface of the bucket walls, drastically reducing the thermal conductivity of the bucket walls and preventing the metal from freezing on the walls at the beginning of the melt production. ki, 1 tab. about $ (L S

Description

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The invention relates to ferrous metallurgy, in particular, to the technology of deoxidation of boiling steel in a ladle.

The purpose of the invention is to increase the yield of suitable steel,

The method of deoxidizing boiling steel includes the addition of ferromanganese and aluminum to the ladle and steel production, as slag aluminum production is produced as aluminum at a mass ratio of the components of ferromanganese deoxidizing agents and secondary aluminum slag production 1: 0 || 2-1: 1 with total consumption mixtures of I - 3 kg / ton of steel, and ferromanganese were added to fractions of 0.002-0.003 m.

The joint input of ferromanganese and slag from the production of secondary aluminum provides for the creation of a metal slag skull on the surface of the walls of the ladle, drastically reducing the thermal conductivity of the walls of the ladle and preventing the metal from freezing to the walls at the beginning of the release of smelting. The formation of residual solid metal in the ladle is related to the oxygen concentration in the metal. Maximum loss of metal in the form of goats in the ladle is observed after pouring the boiling metal, losses are slightly lower when casting semi-quiet metal and are practically absent when casting otal. Therefore, an additional effect, which eliminates the formation of residual solid metal in the ladle, is the deoxidation of the first portions of metal with metallic aluminum,

A decrease in the oxygen content in the first portions of the liquid metal leads to an increase in the surface tension and a decrease in adhesion. In this case, the wetting of the bucket walls with liquid steel is reduced, which reduces the probability of formation of wall formations on the bucket walls,

When using a ferromanganese fraction of less than 0.002 m, the removal of material from the ladle increases, the dissolution of ferromanganese in steel slows down, and its consumption for deoxidation increases.

When using ferromanganese fractions of more than 0.003 m, the density of the skull layer on the walls of the bucket decreases and the time it dissolves, the probability of residual formation increases.

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forged solid metal in a ladle after casting.

When the mass ratio of ferromanganese and slag production of secondary aluminum is more than 1: 0.2, the amount of aluminum in the mixture decreases, the oxygen content in the first portions of the metal increases, the probability of formation of solid metal residues in the ladle after casting increases.

When the ratio of the components of the mixture is less than 1: 1, the oxidation of the whole mass of the metal and the yield of steel become lower due to the boiling point of the metal in the mold.

With a mixture consumption of less than 1 kg / ton of steel, the effect of creating slag skull on the walls of the ladle and reducing the oxidation of the first portions of the metal is not achieved.

When the mixture consumption is more than 3 kg / t of steel, the oxidation of the metal decreases. In both cases, the yield of steel is reduced.

The application of the proposed method for the deoxidation of boiling steel ensures the prevention of the formation of goats in ladles and increases, due to this, the yield of usable steel,

PRI me R. HKP grade 5 steel is melted in a 900-ton open-hearth furnace. Upon reaching a carbon concentration of 0.18-0.22%, ferromanganese is introduced into the furnace at the rate of obtaining the average specified manganese content in the finished steel, taking into account the ferro-manganese introduced into the ladle. Before the release, a mixture of ground ferromanganese and slag is produced. recycled aluminum

The table presents the values of the yield of suitable steel depending on the operating parameters of the deoxidation.

It follows from the data in the Table that the implementation of the method with the proposed values of the operating parameters significantly increases the yield of steel due to the complete elimination of solid metal residues in the ladle.

Claims (1)

Invention Formula The method of deoxidation of boiling steel, which includes the addition of ferromanganese and aluminum to the ladle and the release of steel into it, which is equivalent to that. 313-217554 that, in order to increase; the yield of the ingredients of ferromanganese risers staples as aluminum prisazi-and slag 1: 0.2-1: 1 with a total consumption The slag produced by the secondary mixture is -3 kg / t of steel, while the ferroaluminium mass ratio of the manganese component is introduced into fractions of 0.002-0.003 m.