SU1224342A1 - Method of manufacturing converter steel - Google Patents

Description

The invention relates to the metallurgy of ferrous metals, specifically to methods for the production of converter steel. The purpose of the invention is to save margarine-containing ferroalloys and to improve the quality of steel during discharge.

As carbon-containing additives, ordinary ground coke used in metallurgy was used.

As a manganese-containing metal concentrate, an experimentally obtained product of processing and enrichment of o-slags of the production of silica-manganese was used. Its composition contains 82% of metallic particles of manganese alloys, while the manganese content is 54%, and silicon is 14-17%. Another component of the manganese-containing metal concentrate is the slag phase (18 vol.%), Represented by the manganese ass.

To establish the optimal effect of deoxidizing converter steel, pilot industrial studies were performed. Steel (Cfc, FLC, 5 FPS) was smelted in oxygen converters with upper, bottom and combined purge of conventional charge and additive materials. Upon reaching the required parameters of the melt (temperature, carbon content, sulfur, phosphorus), a low carbon metal (C 0.10%) was poured into a steel-pouring ladle, with the necessary additives added to the stream. At the same time, when the metal level in the ladle is 1 / 8-1 / 7 high, a mixture of metallurgical coke and manganese-soda: rusting concentrate was introduced at a ratio of 1: 1 to 9: 1 (by weight). Then, upon reaching the metal level in the ladle 1 / 6-1 / 5 of the height of the input, the remaining amount of the mixture of metallurgical coke and manganese-containing metal concentrate at a ratio of 1: 9 weight.h. At the end of the day, the metal was squeezed into the ladle with an aluminum additive (when the steel of the grade 3 was overhead. 50 g / t was attached) except steel 5 FPS, on which the aluminum did not sit down. When smelting steel 3 SP. after entering the mixture of metallurgical coke and manganese-containing concentrate (second stage)

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The silicon contained in the metal was corrected with an additional additive of 45% ferrosilicon (2.5 kg / ton of steel) and aluminum (700 g / ton of steel). The latter were introduced into the ladle before filling it with metal at 1/2 height. When conducting pilot tests, the additive of a mechanical mixture of coke or manganese-containing metal concentrate was made using the existing automated system for supplying deoxidizers and other bulk materials to the converter and to the ladle with the adjustment of the manganese-containing metal additive manually (into the ladle). The amount of metallic metallurgical coke, manganese-containing metal concentrate was taken based on specific conditions: steel grade, oxidation of the melt, residual manganese in the metal. Taking into account the fact that the average content of manganese in manganese-containing metal concentrate (54%) is lower than that used in silico-manganese e (65-72%), the consumption of this metal concentrate is avil in all cases in respectively increased (1.2) - 1.33 times) the amount recalculated by apnee manganese ..;.

Before mechanical mixing and the use of ground coke and manganese metal concentrate, the latter was used by sony. Drying was carried out on drying devices in the workshop with a mechanized system for the preparation of deoxidizers and other bulk materials according to the existing technology.

Deoxidation of the metal in the ladle using the proposed method to maximize the effect of water production in the production of calm and semi-quenching steel grades due to the presence of silicon in manganese-containing concentrate in the range of 14-17%. Use of the invention is possible in the case of the production of boiling steel of tin steel. Capture where the silicon content is allowed to 0.07%.

The results of experimental-industrial studies of the method of production of steel and smelting technology are presented in the table.

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Analysis of the results testifies to the effectiveness of this technical solution, which allows to achieve the replacement of manganese-containing ferroalloys in the amount of 2-100% and increase in the quality of steel, expressed in reducing the chemical inhomogeneity of the metal in manganese content to 0.005-0.012% versus 0.021-0.026% by a known method . This is achieved through the combined use of simultaneously the effect of factors and parameters of the hydrodynamic, deoxidizing and refining action, taking into account the positive thermophysical characteristics of the manganese-containing metal concentrate. Thus, the use of the latter in accordance with the invention provides a more uniform, accelerated editor. N. Shvyschka Compiled by M. Pribavkin

Tehred N. Bonkalo Proofreader L. Patay

1892/25 Circulation 552Subscription

VNIIPI USSR State Committee

p6 cases of inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, Proektna St., 4

 melting and dissolving manganese in the metal over the entire height of the steel –electric gravel, than using a metal concentrate from standard

J ferroalloys, for example ferromanganese, silicomanganese. This is due to the fact that the manganese metal concentrate is significantly less in fractional composition (0.02-20 mm),

JO than ferroalloys commonly used in metal deoxidation in kvshe (20-50 mm). Therefore, taking into account the reduction of the kinematic forces of its penetration deep into the metal, the sit down metal 15 concentrate in combination with an additive of carbon-containing material providing a high level of mass exchange, sparged 1 g, evenly ensures depletion and doping

20 over all levels of bucket height.

Claims (1)

. METHOD FOR PRODUCING CONVERTER STEEL, 'including scrap filling, cast iron casting, purging the bath using top or combined blasting, discharge into the ladle, low-carbon metal deoxidation; in the ladle using standard ferroalloys and technological ferroalloy production wastes, characterized in that saving manganese-containing ferroalloys and improving the quality of steel during discharge, a mixture of carbon-containing additives and a manganese-containing metal concentrate is introduced into the ladle under a stream of metal, When the bucket is heated at 1 / 8-1 / 7 of its height, the mixture is introduced at a ratio of carbon-containing additives and manganese-containing metal concentrate 9: 1 (by weight), and by filling 1 / 6-1 / 5 the height of the bucket is 1: 9, after which they are added other alloying materials.