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Oxygen top blown converter steel making method

A converter steel-making and oxygen top-blowing technology, applied in the direction of manufacturing converters, etc., can solve the problems of difficult to control splashing and back-drying, low steel-making efficiency, and achieve the effect of avoiding splashing and back-drying and improving efficiency.

Inactive Publication Date: 2009-11-11
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of adding a large amount of steelmaking raw materials in the steelmaking method of the prior art, which makes it difficult to control splashing and dry back in the steelmaking process and low steelmaking efficiency, the present invention provides a method for adding a large amount of steelmaking raw materials in the steelmaking process. Oxygen top-blown converter steelmaking method with high steelmaking efficiency and auxiliary materials but no splashing and dry back during steelmaking process

Method used

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  • Oxygen top blown converter steel making method

Examples

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Effect test

Embodiment 1

[0020] This example is used to illustrate the oxygen top-blown converter steelmaking method provided by the present invention.

[0021] Add 132 tons of vanadium-extracted semi-steel into the converter for smelting, wherein the composition of the semi-steel and the furnace temperature are shown in Table 1, then blow oxygen into it and add auxiliary materials, the added auxiliary materials (lime, high-magnesium lime and The total weight of acidic composite slag) and the total amount of blown oxygen are as shown in Table 2, and the relationship between the addition of auxiliary materials and the corresponding oxygen blowing amount when adding auxiliary materials is as follows: taking the total amount of blown oxygen as a benchmark, the oxygen blowing amount When it is 1%, add 60% by weight of lime of the total amount of lime, 60% by weight of high-magnesia lime of the total amount of high-magnesia lime and 80% by weight of acid composite slag of the total amount of acid composite ...

Embodiment 2

[0030] This example is used to illustrate the oxygen top-blown converter steelmaking method provided by the present invention.

[0031] 138.36 tons of vanadium-extracted semi-steel were put into the converter for smelting, and then 6.969 tons of steel scrap were added to it. According to the carbon content of the semi-steel and the amount of steel scrap added, the static steelmaking model is used to calculate by computer that it is necessary to add a temperature raising agent to raise the temperature of the steelmaking system by 15°C. Blow oxygen into the converter and add auxiliary materials, the total weight of the added auxiliary materials (lime, high magnesium lime, acidic composite slag and graphite (model YB / T 044-2007)) and the total amount of oxygen blown are shown in Table 5 As shown, the relationship between the addition of auxiliary materials and the corresponding oxygen blowing amount when adding auxiliary materials is as follows: taking the total amount of oxygen ...

Embodiment 3

[0040] This example is used to illustrate the oxygen top-blown converter steelmaking method provided by the present invention.

[0041] 135.2 tons of vanadium-extracted semi-steel were put into the converter for smelting, and then 6.17 tons of steel scrap were added to it. According to the carbon content of the semi-steel and the amount of steel scrap added, the static steelmaking model is used to calculate by computer that it is necessary to add a coolant to lower the temperature of the steelmaking system by 25 °C. Oxygen is blown into the converter and auxiliary materials are added, the added auxiliary materials (lime, high magnesium lime, acid composite slag and sludge balls (produced from finely powdered converter sludge containing 45-50% by weight of metallic iron)) The total weight and the total amount of oxygen blown in are shown in Table 8. The relationship between the addition of auxiliary materials and the corresponding oxygen blowing amount when adding auxiliary mat...

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Abstract

The invention relates to an oxygen top blown converter steel making method, comprising the following steps: the steel material is added to a converter, oxygen is blown into the converter by an oxygen lance and auxiliary materials are added into the furnace by stages in the process of oxygen blowing; wherein the steel material comprises semisteel; lance position of the oxygen lance moves within 1.5-2.2m above molten steel liquid surface in the converter, wherein blowing beginning lance position is 1.95-2.05m, blowing lance position is 1.5-2.2m and catch carbon lance position is 1.7-1.75m; wherein, the auxiliary materials comprise compound slag, lime and high-magnesium lime; in every ton of semisteel, 17-20kg of the compound slag is used, 30-34.5kg of lime is used, 30-34.5kg of high-magnesium lime is used, a total of 43-53 cubic meters of oxygen is blown into the furnace; with the total content of the blown oxygen as a benchmark, the first batch of auxiliary materials are added when the oxygen blowing content is 0.8-2%; with the method of the invention adopted, steelmaking time can be reduced and slag splashing and drying can be effectively avoided in the process of steelmaking.

Description

technical field [0001] The invention relates to a method for making steel in an oxygen top-blown converter. Background technique [0002] The raw material used in Panzhihua Steel Plant is molten iron containing V and Ti. In order to extract the useful element vanadium in molten iron, Panzhihua Iron and Steel adopts a double-link process, that is, the molten iron needs to go through a special vanadium extraction converter for vanadium extraction, and the molten iron after vanadium extraction becomes Semi-steel, and then semi-steel molten iron is sent to the steelmaking converter for steelmaking. With the increase of Panzhihua Iron and Steel's variety of steel production, especially some high value-added products have stricter requirements on the end point S, P, O and N content values ​​(hopefully as low as possible), how to quickly and effectively produce low P and S steels has become a high priority for production. Bottleneck of quality steel. [0003] Compared with ordina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/32
Inventor 梁新腾陈永李安林戈文荪何为肖明富李桂军杨森祥李清春蒋龙奎杨辉合孙维松
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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