Convertor smelting technology method for producing low-phosphorous steel

A converter smelting and process method technology, applied in the manufacture of converters, etc., can solve the problem of in-depth dephosphorization without more detailed research reports, and achieve the effect of reducing raw material consumption

Inactive Publication Date: 2012-02-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main purpose of the MURC process developed by Nippon Steel is to save lime, and there is no more detailed research report on in-depth dephosphorization

Method used

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  • Convertor smelting technology method for producing low-phosphorous steel
  • Convertor smelting technology method for producing low-phosphorous steel
  • Convertor smelting technology method for producing low-phosphorous steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The initial phosphorus content of molten iron [%P]=0.0785, the temperature T=1305℃, and the oxygen supply in the early stage blowing is 3900Nm 3 , the amount of lime is 2.5t, the amount of iron ore is 2.0t, the amount of dolomite is 0.5t, the blowing time is 340 seconds, and the P 2 o 5 The percentage content is 3.71, 2.0t of lime and 1.5t of dolomite are added in the second stage of blowing, the molten steel at the end of the converter [%P]=0.0089, the temperature T=1689℃, and the final slag P 2 o 5 The percentage content is 1.66.

Embodiment 2

[0019] The initial phosphorus content of molten iron [%P]=0.0787, the temperature T=1255°C, and the oxygen supply in the early stage blowing is 3900Nm 3 , the amount of lime is 4.0t, the amount of iron ore is 1.5t, the blowing time is 345 seconds, and the P 2 o 5 The percentage content is 3.60, 2.5t of lime and 1.5t of dolomite are added in the second stage of blowing, the molten steel at the end of the converter [%P]=0.0085, the temperature T=1692℃, and the final slag P 2 o 5 The percentage content is 1.67.

Embodiment 3

[0021] The initial phosphorus content of molten iron [%P]=0.0804, the temperature T=1281℃, and the oxygen supply in the early stage of blowing is 4000Nm 3 , the amount of lime is 3.0t, the amount of iron ore is 1.0t, the amount of dolomite is 0.5t, the blowing time is 368 seconds, and the P 2 o 5 The percentage content is 3.26, 2.5t of lime and 2.0t of dolomite are added in the second stage of blowing, the molten steel at the end of the converter [%P]=0.0061, the temperature T=1658℃, and the final slag P 2 o 5 The percentage content is 1.79.

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Abstract

The invention relates to the technical field f convertor steel making in metallurgy industries, in particular to a method for smelting low-phosphorous steel through combined steel-tapping slag-left and double slag process technology, which aims at providing convertor technology for producing the low-phosphorous steel. The method prolongs previous dephosphorization blowing time, thereby prolonging reaction time of steel slag in a previous blowing stage, improving reaction temperature of dephosphorization steel slag in previous blowing, improving dynamics and thermodynamics conditions of steel slag reaction, improving dephosphorization effect in previous blowing and enabling phosphorus in steel liquid to be absorbed in slag as much as possible. Slag with high P2O5 content is poured out of a convertor so as to reduce phosphorus content of the whole convertor system, providing favorable conditions for dephosphorization in a later decarburization blowing stage and achieving the purpose of producing the low-phosphorous steel. Compared with other methods for producing the low-phosphorous steel, the method for producing the low-phosphorous steel has the advantages of being simple in operation methods, low in cost, easy to obtain and the like.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking in the metallurgical industry, and mainly relates to a converter smelting process method for producing low-phosphorus steel by adopting a slag left in tapping and a double slag smelting method to remove phosphorus in molten steel. Background technique [0002] Phosphorus is an element that is easy to segregate in steel. When the phosphorus content in steel is greater than 0.015%, the segregation of phosphorus increases sharply and increases the hardness of the segregation zone. At the same time, phosphorus also deteriorates the welding performance of steel and significantly reduces the low temperature impact of steel. Toughness, increasing the brittle transition temperature of steel, making steel prone to cold and brittle phenomena. Generally, high-quality steel has a strict upper limit on the phosphorus content, most of which require the phosphorus content to be less than 0.015%, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/30
Inventor 王新华何肖飞王万军陈书浩黄福祥
Owner UNIV OF SCI & TECH BEIJING
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