SU1341217A1 - Method of producing alloyed steels - Google Patents

Abstract

This invention relates to the steel industry. In order to increase the quality of steel, the degree of assimilation of alloying elements, it was proposed to perform a modifying treatment in two stages. The consumption of modifiers in the second and first stages is 1: (2-A). After the first stage of the modifying treatment, micro-alloying additives are introduced into the metal. The flow rate of the modifier in the second stage of processing is 0.5- I, 0 of the consumption of micro-alloying additives. The total consumption of the modifier is 1-4 kg / t of steel. Alloys containing calcium and barium in the ratio 1: (1-3) can be used as a modifier. The deep deformation of the metal, the subsequent introduction of microalloying additives into the treated metal ensures an even distribution of elements in the bucket volume and a high degree of their assimilation. 2 hp f-ly, 1 tab. § SL

Description

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The invention relates to ferrous metallurgy, namely to the production of high-quality steels, and can be used in steelmaking (s shops of metallurgical plants.

The invention is to improve the quality of steel, the degree of assimilation of alloying elements and the provision of deep desulfurization of steel.

Conducting a modifying treatment in two stages is associated with the need to prepare metal pepper by introducing micro-alloying additives. The preparation of the metal is to ensure

its hot reddening and desulfurization. A further increase in the processing steps does not significantly change the quality of the metal in the required direction before introducing micro-doping additives.

Thus, the most technologically advanced is the next sequence of operations; primary metal processing (first stage) and the subsequent input of micro-doping additives (second stage).

PRI mere. The metal in the steel teeming ladle is blown with powdered reagents at a rate of, for example, 2 kg / ton of steel — the first stage, which allows to obtain a deeply deoxidized and desulfurized metal. Immediately Huspere with Exhaustive Doving of this amount of the modifier, micro-alloying additives are introduced into the metal and simultaneously flushed with a modifier with a lower flow rate (BTOpoi stage i).

When modifying with calcium and barium alloys and when microalloying with alloys containing barium, barium will be used as a modifying additive. In this case, alloys based on niobium and vanadium are used for microalloying, which contain barium, which is a technological additive. In this case, the micro-alloying additionally modifies the steel, i.e. the alloy is complex: it simultaneously micro-alloyes and modifies the metal.

In the proposed method, strong barium calcium with the following chemical composition is used: Si 48; Ca 10; Ba 17; Fe rest. In addition, silicon barium barium of the following chemical composition is used,%: Si 10; V 38; Ba 10; Fe rest.

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The essence of the method is to improve the quality of steel, the degree of assimilation of micro-alloying elements, and ensure ultra-low sulfur content in the metal, for which initially deep desulfurization of the metal is carried out by introducing elements with high affinity for sulfur. The subsequent introduction of micro-alloying additives into the deeply deoxidized and desulfurized metal provides the necessary form of the presence of elements in the steel, their uniform distribution over the bucket volume and a high degree of assimilation, since there is no exothermic reaction of the alkaline metal of the AFM reactants with the metal.

The greatest effect of desulfurization and metal modification is observed when using alloys containing calcium and barium at a ratio of 1: (1-3), which is associated with an increase in the residence time of modifiers in the metal due to a decrease in the elasticity of its vapors, eliminating the explosive nature of the reaction, was sprayed accompanying the input of calcium-containing alloys in liquid steel.

The use of micro-alloying elements with an alloy content of 5–20% barium prevents the elements from interacting with the metal oxygen and increases the degree of steel modification.

Studies have found that modifying processing is necessary in two stages, and when the cost ratio in the second and first periods is 1: (2-4) .. With a cost ratio of less than 1-4, it is impossible to ensure effective metal modification in the second period, to prevent Oxygen leakage from the lining to protect microalloying additives from oxidation. Increasing the flow ratio of more than 1: 2 does not allow reducing the sulfur and oxygen content after the first treatment period to the required values.

 The use of calcium and barium alloys with a ratio of not 1: (1-3) will, on the one hand, lead to a decrease in the modifying capacity of the alloy, and on the other, to a decrease in its desulfurization ability. In addition, the specified ratio of calcium and barium in the alloy provides the most technologic thallus.

introducing it into the liquid after the preprocessing with modifiers creates the most favorable conditions for introducing microalloying elements into the metal, ensuring the required stability of absorption and the necessary form of their presence. The effectiveness of the input micro-alloying elements depends on the consumption of the modifier in the second period. Studies have shown that the modifier consumption in the second period (0.5-1.0) from the consumption of alloying additives is optimal. When the cost ratio is less than 0.5, no effect of the modifier on nonmetallic inclusions is observed;

Technological variants of modifying treatment, micro alloying and quality indicators of the production of low alloy steel

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The data of these heats showed that 55 elements and ultra-low concentration using the proposed method of sulfur in the metal.

Claims (3)

while respecting the claimed parameters, the claims allow to obtain high quality 1. Method for the production of alloyed steel, degree of mastering of alloying steels, including smelting ms 34121 7 the quality of the metal, as its oxygen content increases. Increasing the cost ratio over n 1.0 is not advisable due to an increase in the total flow rate of the modifier, a decrease in the efficiency of its input, excessive contamination of the metal, an increase in the processing time, 10 erosion of the lining of the ladle. To estimate the parameters of the method, experimental melting was carried out with the output of each parameter beyond the upper and lower boundary values. In addition, 15 were melted at the lower, upper and average values of the required parameters and in accordance with the method of the prototype. The results of the experimental heats are listed in the table. 0.036 85 89 51 tal in the steelmaking unit, alloying and micro-alloying in the process of modifying the treatment in the ladle with powdery reagents, due to the fact that, in order to improve the quality of steel, the degree of assimilation of alloying elements and ensure deep desulfurization of the steel, the modifying treatment is carried out in two stages at a cost ratio. in the second and first stage l (2-A), the micro-alloying additives are introduced into the metal after the first stage of processing with a modifier consumption per Editor Y. Sereda Compiled by M. Pribavkin Tehred M. Khodanich Proofreader M. Pojo Order 4402Аз 1 Circulation 549 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 at the second stage is 0.5-1.0 from the consumption of micro-alloying additives, while the modifying treatment is carried out with the consumption of modifier 1-4 kg / t of steel. 2. A method according to claim I, characterized in that the modifying treatment is carried out with alloys containing hundreds of calcium and barium in a ratio of 1: (1-3). 3. Method POP.1, which differs from the fact that microalloying elements are introduced into the metal in the form of an alloy containing 5–20% barium.