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Low-oxygen pressure converter steelmaking method

A converter steelmaking and oxygen pressure technology, applied in the manufacture of converters, etc., can solve problems such as production, quality accidents, splashing, and excessive oxidation of final slag, and achieve the effects of avoiding production interruption, reducing erosion and reducing risks.

Active Publication Date: 2013-12-18
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working oxygen pressure of the oxygen lance oxygen supply is generally 0.9-1.1Mpa. If the oxygen pressure is lower than this, that is, the oxygen flow rate during blowing cannot reach the set oxygen flow rate, which will cause splashing during the blowing process of the converter and oxidation of the final slag. Excessive strength, uneven temperature of molten steel at the end point and other bad phenomena, which will cause accidents in production and quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] When the working oxygen pressure is between 0.75≤oxygen pressure<0.85Mpa, compared with the normal oxygen pressure operation:

[0033] 1) The position of the process gun is lowered by 300-500mm;

[0034] 2) The position of the carbon gun is lowered by 300-400mm;

[0035] 3) Lightly burned dolomite is added to reduce 6-8kg per ton of steel;

[0036] 4) Active white ash is added to increase 5-10kg per ton of steel;

[0037] 5) The carbon pulling time is increased by 30 seconds.

Embodiment 2

[0039] When the working oxygen pressure is between 0.65Mpa≤oxygen pressure<0.75Mpa, compared with normal oxygen pressure operation:

[0040] 1) The position of the process gun is lowered by 400-600mm;

[0041] 2) The position of the carbon gun is lowered by 400-500mm;

[0042] 3) Lightly burned dolomite is added to reduce 10-15kg per ton of steel;

[0043] 4) Active white ash is added to increase 8-12kg per ton of steel;

[0044] 5) The carbon pulling time is increased by 1 minute.

Embodiment 3

[0046] When the working oxygen pressure is less than 0.65Mpa, through practice and theoretical calculation, it is not suitable for blowing operation due to the blowing effect and intrinsic safety considerations.

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Abstract

The invention discloses a low-oxygen pressure converter steelmaking method. The low-oxygen pressure converter steelmaking method is characterized in that when the actual oxygen supply flow cannot achieve the oxygen flow of objective requirement, the oxygen pressure is smaller than 0.85 Mpa and greater than or equal to 0.75 Mpa, or the oxygen pressure is smaller than 0.75 Mpa and greater than or equal to 0.65 Mpa, or the oxygen pressure is smaller than 0.65 Mpa, the position of an oxygen lance, the adding amount of light burned dolomite and active lime and the carbon catching time are adjusted according to the oxygen pressure. Compared with the prior art, the low-oxygen pressure converter steelmaking method has the beneficial effects that stable blowing and safe production can be achieved at low oxygen pressure; production interruption or delay of progress of works caused by low oxygen pressure is avoided; corrosion of high-oxidability slag on a lining is reduced; the risk of a safety accident is also effectively reduced.

Description

technical field [0001] The invention relates to the field of converter smelting, in particular to a low oxygen pressure converter steelmaking method. Background technique [0002] For converter smelting, the oxygen supply system is one of the key technologies of converter smelting, and a reasonable oxygen supply system plays a vital role in the smooth smelting process and uniform temperature of components. The working oxygen pressure of the oxygen lance for oxygen supply is generally 0.9-1.1Mpa. If it is lower than this oxygen pressure, the oxygen flow rate during blowing cannot reach the set oxygen flow rate, which will cause splashing during the blowing process of the converter and oxidative properties of the final slag. Excessive strength, uneven temperature of molten steel at the end point and other bad phenomena will cause accidents in production and quality. With the large-scale development of converters, low oxygen pressure events due to oxygen plant failures and equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30
Inventor 郭猛张越赵志刚马勇王鹏王鹏飞王小善康永弟简龙毛志勇张志文孙艳霞
Owner ANGANG STEEL CO LTD
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