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Method for reducing rephosphorization amount in convertor steelmaking process

A converter steelmaking and steel tapping process technology, applied in the manufacture of converters, etc., to increase the converter smelting cycle, reduce the amount of phosphorus returned to molten steel, and improve the ability of phosphorus fixation

Active Publication Date: 2012-11-21
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] Domestic and foreign papers and patents involve measures to control the amount of phosphorus return, focusing on reducing the amount of phosphorus returned by controlling the amount of slag or adding dephosphorization agents during the tapping process, dephosphorizing outside the furnace, modifying the final slag in the converter, and preventing phosphorus return , there is no relevant report

Method used

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  • Method for reducing rephosphorization amount in convertor steelmaking process
  • Method for reducing rephosphorization amount in convertor steelmaking process

Examples

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Effect test

Embodiment 1

[0028] A domestic steel plant smelted GCr15 bearing steel with a 210-ton converter. At the end of smelting, the same sample tapping time was 4.6 minutes, and the carbon content at the end was 0.42%. Add 450Kg of FeO-containing powder during the sampling period, and the bottom blowing argon gas flow rate is 20NL 3 / min, the top oxygen blowing flow rate per ton of steel is 150NM 3 / h, the height of the oxygen lance from the liquid steel surface is 2.0 meters, and the slag foams after the soft blowing lasts for 35S. Before the method is implemented, the detection result of phosphorus content in molten steel is 0.009% (mass percentage, the same below), and the phosphorus content is 0.011%.

Embodiment 2

[0030] A domestic steel mill smelted high-strength ship plate D36 with a 210-ton converter. At the end of smelting, the tapping time for the same sample was 5.2 minutes, and the carbon content of the tapping was 0.10%. Add 408Kg of FeO-containing powder during the equal sample, and the bottom blowing argon gas flow rate is 20NL 3 / min, the top oxygen blowing flow rate per ton of steel is 200NM 3 / h, the height of the oxygen lance from the liquid steel surface is 2.2 meters, and the slag foams after the soft blowing lasts for 30S. Before the method is implemented, the detection result of phosphorus content in molten steel is 0.008%, and the phosphorus content is 0.009%.

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Abstract

The invention relates to a method for reducing rephosphorization amount in a convertor steelmaking process, which belongs to the field of steelmaking and mainly relates to slagging and slag modification in a process of tapping with waiting sampling at the end of convertor steelmaking and improvement in the phosphorus immobilizing capacity of slag by controlling the properties of the slag for preventing rephosphorization. Usually, a single slag process is used for smelting low-phosphorus steel; and the phosphorus content of the steel smelted by the single slag process is less than 0.015 percent, and the rephosphorization amount is between 0.002 and 0.004 percent. While when the new process is adopted, the phosphorus content of the steel smelted by the single slag process is less than 0.015percent and the rephosphorization amount is between 0 and 0.002 percent. The process has the advantages of improving the properties of the slag quickly, improving phosphorus immobilizing capability and lowering rephosphorization amount.

Description

Technical field: [0001] The invention relates to a converter steelmaking process, in particular to a method for reducing phosphorus return in the converter steelmaking process. Background technique: [0002] The invention relates to a method for reducing phosphorus return in a converter steelmaking process, belongs to the field of steelmaking, and mainly relates to slagging and slag modification in the process of equal sample steel tapping at the end of converter smelting. Phosphorus in steel is a harmful element. High phosphorus content will cause the "cold brittleness" of steel, reduce the low-temperature plasticity and impact toughness of high-equivalent steel, and make the welding performance and cold bending performance of steel worse; phosphorus is to reduce the steel With the increase of phosphorus content, the surface tension of molten steel decreases significantly, thereby reducing the crack resistance of steel; phosphorus has a high degree of segregation in continu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/35
Inventor 王海宝刘洋姜中行吕延春李鹏程王文军刘启江徐莉刘美艳沈钦义
Owner SHOUGANG CORPORATION