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A converter steelmaking process

A converter steelmaking and process technology, applied in the field of iron and steel smelting, can solve the problems of slow oxidation of solute primary color, low FeO content, low oxygen utilization rate, etc., to improve kinetic conditions, increase utilization rate, and facilitate slagging and chemical Slag effect

Active Publication Date: 2019-11-01
TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patent adopts constant pressure and variable lance position to supply oxygen. When operating at a high lance position, it is beneficial to slag melting, but the stirring of the molten pool is poor and the primary color of the solute is oxidized slowly, and the utilization rate of oxygen is low. When operating at a low lance position, the slag in the slag FeO content is low, which is not conducive to slag melting. In actual operation, the gun position needs to be changed frequently. If the gun position is not changed in time, splashing is easy to occur, resulting in metal loss.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: as figure 1 Shown, a kind of converter steelmaking process comprises the following steps:

[0038] Step 1, prepare molten iron and scrap steel, the weight percentage of molten iron is 70%, the weight percentage of scrap steel is 30%, control the temperature of molten iron ≥ 1250 ℃, P≤0.12%, Cr≤0.25%, add molten iron to converter, and then Preheated steel scrap is added to the converter;

[0039] Step 2, continuously blowing oxygen into the lowering gun, and adding the first batch of slagging materials at the same time, the gun position is constant when blowing oxygen, the oxygen pressure is 0.7MPa in 0-6 minutes, 1.2MPa in 7-10 minutes, 11- The oxygen pressure is 1.0MPa at 15 minutes, 1.3MPa at 16-18 minutes, and the oxygen supply intensity is 2.0m 3 / t.min;

[0040] Step 3, add the second batch of slag-forming material to continue blowing at 5-6 minutes, and control the alkalinity of the slag at 3.0;

[0041] Step 4: Invert the furnace, measure temper...

Embodiment 2

[0044] Embodiment 2: A converter steelmaking process, which is different from Embodiment 1 in that it includes the following steps:

[0045] Step 1, prepare molten iron and scrap steel, the weight percentage of molten iron is 72.5%, the weight percentage of scrap steel is 27.5%, control the temperature of molten iron ≥ 1250 ℃, P≤0.12%, Cr≤0.25%, add molten iron to converter, and then Preheated steel scrap is added to the converter;

[0046] Step 2, continuously blowing oxygen into the lowering gun, and adding the first batch of slagging materials at the same time, the gun position is constant when blowing oxygen, the oxygen pressure is 0.7MPa in 0-6 minutes, 1.2MPa in 7-10 minutes, 11- The oxygen pressure is 1.0MPa at 15 minutes, 1.3MPa at 16-18 minutes, and the oxygen supply intensity is 2.0m 3 / t.min;

[0047] Step 3, add the second batch of slag-forming material to continue blowing at 5-6 minutes, and control the alkalinity of the slag at 3.0;

[0048]Step 4: Invert the ...

Embodiment 3

[0051] Embodiment 3: A converter steelmaking process, the difference from Example 1 is that step 1 prepares molten iron and steel scrap, the weight percentage of molten iron is 75%, the weight percentage of scrap steel is 25%, and the temperature of molten iron is controlled ≥1250℃, P≤0.12%, Cr≤0.25%, put the molten iron into the converter, and then add the preheated steel scrap into the converter;

[0052] Step 2, continuously blowing oxygen into the lowering gun, and adding the first batch of slagging materials at the same time, the gun position is constant when blowing oxygen, the oxygen pressure is 0.7MPa in 0-6 minutes, 1.2MPa in 7-10 minutes, 11- The oxygen pressure is 1.0MPa at 15 minutes, 1.3MPa at 16-18 minutes, and the oxygen supply intensity is 2.0m 3 / t.min;

[0053] Step 3, add the second batch of slag-forming material to continue blowing at 5-6 minutes, and control the alkalinity of the slag at 3.0;

[0054] Step 4: Invert the furnace, measure temperature, and ...

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Abstract

The invention discloses a converter steelmaking process, and relates to the technical field of steelmaking in order to solve the problem of metal loss during constant-pressure variable gun position oxygen supply. The converter steelmaking process comprises the following steps that firstly, molten iron and scrap steel are prepared, the molten iron is added into a converter, and then the preheated scrap steel is added into the converter; secondly, a gun is lowered to blow oxygen inwards, a first batch of slagging materials are added at the same time, and during oxygen blowing, a constant gun position variable pressure oxygen supply mode is adopted; thirdly, a second batch of slagging materials are added after five to six minutes for continuous converting; fourthly, converter turning down, temperature measurement and sampling are conducted, and the reblowing time is determined; and fifthly, the gun is lifted up, steel is discharged, and low-nitrogen carbon powder, alumcakes, silicomanganese, ferrosilicon and lime are sequentially added, and secondary refining outside the converter is conducted. The converter steelmaking process is beneficial to slag formation and slug melting, avoidssplashing, reduces metal loss, and promotes decarburization, dephosphorization and desulfuration.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, more specifically, it relates to a converter steelmaking process. Background technique [0002] Converter steelmaking is to blow oxygen into molten pig iron to oxidize impurities such as silicon and manganese. A large amount of heat is released during the oxidation process (1% silicon can increase the temperature of pig iron by 200 degrees Celsius), which can make the furnace reach a sufficiently high temperature. Therefore, converter steelmaking does not need to use additional fuel. The basic tasks of steelmaking are decarburization, dephosphorization, desulfurization, deoxidation, removal of harmful gases and non-metallic inclusions, increase of temperature and adjustment of composition. [0003] A Chinese invention patent with the publication number CN102199682A discloses a semi-steel steelmaking method, which includes converter blowing of semi-steel, addition of slagging agen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/32C21C5/46C21C7/00C22C33/06C22C38/02C22C38/04
CPCC21C5/32C21C5/462C21C7/0006C21C7/0025C21C7/0037C22C33/06C22C38/02C22C38/04Y02P10/20
Inventor 刘晓军刘和家
Owner TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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