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Smelting method of semisteel

A smelting method and converter smelting technology, which is applied in the field of semi-steel smelting, can solve the problems of insufficient heat source of the converter, and it is difficult to increase the carbon content and temperature at the end of the converter at the same time, so as to achieve the effect of increasing the carbon content and temperature

Inactive Publication Date: 2014-07-30
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that it is difficult to simultaneously increase the carbon content and temperature at the end point of the converter in the existing semi-steel smelting method, and provide a semi-steel smelting method that can simultaneously increase the carbon content and temperature of the molten steel at the end point of the converter
Therefore, adding silicon to the semi-steel before smelting the converter can effectively solve the problem of insufficient heat source of the converter during the semi-steel smelting process, while effectively increasing the temperature of the molten steel at the end of the converter, while ensuring the carbon content of the molten steel at the end of the converter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment is used to illustrate the semi-steel smelting method of the present invention.

[0026] The vanadium-extracted semi-steel used in Example 1 contained: 3.5 wt % C, 0.012 wt % Si, 96 wt % Fe, 0.046 wt % P, and 0.006 wt % S.

[0027] (1) Tapping the vanadium-extracted semi-steel at 140t and 1380°C, and adding 1.5kg / ton of semi-steel ferrosilicon (purchased from Sichuan Panyan Technology Co., Ltd., block) with the steel flow when tapping 1 / 3 The silicon content is 75% by weight), and the molten steel is mixed to make the silicon evenly distributed in the semi-steel, and the silicon content in the semi-steel is 0.1% by weight;

[0028] (2) After the tapping is completed, the semi-steel is transferred into a converter for converter smelting. The temperature of molten steel entering the furnace is 1346°C, the temperature of molten steel at the end point of the converter is 1680°C, the carbon content is 0.11% by weight, the sulfur content is 0.007% by weight, an...

Embodiment 2

[0030] This embodiment is used to illustrate the semi-steel smelting method of the present invention.

[0031] The vanadium-extracted semi-steel used in Example 2 contained: 3.62 wt % C, 0.015 wt % Si, 96 wt % Fe, 0.057 wt % P, and 0.004 wt % S.

[0032] (1) Tapping the vanadium-extracted semi-steel at 138t and 1360°C, and adding 1.7kg / ton of semi-steel ferrosilicon (purchased from Sichuan Panyan Technology Co., Ltd., silicon The content is 75% by weight), and the molten steel is mixed to make the silicon evenly distributed in the semi-steel, and the silicon content in the semi-steel is 0.12% by weight;

[0033] (2) After the tapping is completed, the semi-steel is transferred into a converter for converter smelting. The temperature of molten steel entering the furnace is 1355°C, the temperature of molten steel at the end point of the converter is 1690°C, the carbon content is 0.17% by weight, the sulfur content is 0.006% by weight, and the phosphorus content It is 0.007% by ...

Embodiment 3

[0035] This embodiment is used to illustrate the semi-steel smelting method of the present invention.

[0036] The vanadium-extracted semi-steel used in Example 3 contained: 3.4% by weight of C, 0.02% by weight of Si, 95.6% by weight of Fe, 0.053% by weight of P, and 0.005% by weight of S.

[0037] (1) Tapping the vanadium-extracted semi-steel at 139t and 1350°C, and adding 2.0kg / ton of semi-steel ferrosilicon (purchased from Sichuan Panyan Technology Co., Ltd., silicon The content is 75% by weight), and the molten steel is mixed to make the silicon evenly distributed in the semi-steel, and the silicon content in the semi-steel is 0.14% by weight;

[0038] (2) After the tapping is completed, the semi-steel is transferred into a converter for converter smelting. The temperature of molten steel entering the furnace is 1350 ° C, the temperature of molten steel at the end of the converter is 1685 ° C, the carbon content is 0.14% by weight, the sulfur content is 0.007% by weight, a...

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PUM

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Abstract

The invention discloses a smelting method of semisteel, which comprises steps of tapping of semisteel, and smelting in a converter when tapping is completed, wherein the semisteel is subjected to silicon increasing by adding a silicon increasing agent into the steel flow during the tapping process. The method can increase both the carbon content and the temperature of the molten steel at the end point of the converter, reduces the TFe content of converter final slag, thus effectively reduces loss of steel materials, is simple in operation, and strong in practicality, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a semi-steel smelting method. Background technique [0002] At present, when using vanadium titanomagnetite as raw material for steelmaking, vanadium-containing titanium molten iron should be extracted from vanadium-titanium molten iron before converter steelmaking, and then the semi-steel after vanadium extraction is sent to the converter for steelmaking, which is more efficient than ordinary molten iron. In other words, the physical and chemical heat sources of semi-steel are relatively low, which leads to the shortage of heat source in converter steelmaking, and the deep blowing of converters often occurs, resulting in poor quality of molten steel, large consumption of steel materials, and low carbon content in tapping. Patent application CN102094103A discloses a method for increasing the carbon content at the end of the converter, the method proposes a compact ...

Claims

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Application Information

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IPC IPC(8): C21C5/28
Inventor 曾建华张敏龚洪君陈均李扬州杨森祥杜利华李平凡翁建军
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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