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Converter bottom oxygen blowing smelting method

A converter bottom blowing and smelting method technology, which is applied in the field of iron and steel metallurgy, can solve problems such as molten steel overoxidation, achieve the effects of improving the phenomenon of steel returning to carbon, shortening smelting time, and reducing converter splashing

Pending Publication Date: 2021-12-10
河北敬业中厚板有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the problem of molten steel peroxidation caused by pure oxygen blowing by bottom blowing is more prominent, and it is necessary to optimize the oxygen-enriched gas supply mode of bottom blowing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A converter bottom-blown oxygen-enriched smelting method: characterized in that:

[0042] The target value of C content at the end point of converter smelting is 0.03-0.04%. Add 80 tons of qualified molten iron pretreated by KR into the top-bottom combined blowing converter, and switch the bottom blowing gas to natural gas and oxygen. Among them, the bottom blowing brick of the converter is used It is a double-layer casing type, the inner layer of the casing is passed through oxygen, and the outer layer is passed through natural gas. The bottom blowing gas of the inner and outer casing can be switched with argon or nitrogen; during the converter blowing period, the converter bottom blowing gas supply process is the first 80% of the blowing time. Oxygen is supplied from each layer, and bottom-blown oxygen and natural gas are supplied synchronously with top-blown oxygen. During blowing, the converter stops oxygen blowing under any circumstances, and bottom-blown oxygen an...

Embodiment 2

[0052] A converter bottom-blowing oxygen-enriched smelting method, characterized in that: the target value of C content at the end point of converter smelting is 0.07-0.08%, and 100 tons of qualified molten iron pretreated by KR is added to the top-bottom double-blowing converter, and the bottom blowing gas is switched to god

[0053] Natural gas and oxygen, among which the blowing brick at the bottom of the converter adopts a double-layer casing type, the inner layer of the casing is passed through oxygen, and the outer layer is passed through with natural gas. The bottom blowing gas of the inner and outer casing can be switched with argon or nitrogen; during the converter blowing period, the converter bottom blowing gas supply process is the first 80% of the blowing time. Oxygen is supplied from each layer, and bottom-blown oxygen and natural gas are supplied synchronously with top-blown oxygen. During blowing, the converter stops oxygen blowing under any circumstances, and ...

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PUM

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Abstract

The invention discloses a control model for converter bottom blowing oxygen-enriched smelting. The converter smelting time can be shortened, converter smelting period can be matched with continuous casting period, converter splashing is reduced, and converter tapping molten steel peroxidation is controlled, and hydrogen in the steel brought by the covering gas is reduced through an external refining technology. According to the control model, the smelting time can be shortened by about 11-16%, and the matching of the converter smelting period and the continuous casting period can be realized.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a smelting process for shortening converter smelting time, reducing converter spatter, and controlling peroxidation of molten steel in converter tapping, and specifically refers to a converter bottom oxygen blowing smelting method. Background technique [0002] In the last century, steel mills in Luxembourg and Austria in Western Europe experimented with blowing a certain amount of oxygen at the bottom of the converter to achieve re-blowing oxygen supply at the top and bottom, and developed a new converter steelmaking process, which was later adopted by Nippon Steel. During the application, it was found that the operation of bottom blowing oxygen in the later stage of converter blowing will lead to high oxygen content in steel, cover gas, resulting in high hydrogen content in steel, low alloy yield, many inclusions in steel, and bottom blowing air bricks. Due to the low s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/35C21C7/10
CPCC21C5/35C21C7/10Y02P10/143
Inventor 杨海西樊利智齐进刚王少博刘元霞
Owner 河北敬业中厚板有限公司