CN102296158A - Method for preventing molten steel from splashing during refining - Google Patents
Method for preventing molten steel from splashing during refining Download PDFInfo
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- CN102296158A CN102296158A CN201010209257XA CN201010209257A CN102296158A CN 102296158 A CN102296158 A CN 102296158A CN 201010209257X A CN201010209257X A CN 201010209257XA CN 201010209257 A CN201010209257 A CN 201010209257A CN 102296158 A CN102296158 A CN 102296158A
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Abstract
The invention provides a method for preventing molten steel from splashing during refining. The method comprises the following steps of: slowly reducing pressure in a vacuum chamber during molten steel refining of a vacuum cycle degassing furnace, namely an RH (Ruhrstahl Heraeus) furnace; setting target pressure of a pressure control device to be 18-22kPa; decarbonizing for 5 minutes and then setting the target pressure to be 8-12kPa; cancelling pressure control after decarbonizing for 10 minutes; adding aluminum in a proportion of 0.04-0.10kg per ton of steel when splashing still exists; and quickly reducing the oxygen content of the molten steel in the vacuum chamber. Thus, the splashing of the molten steel in the vacuum chamber is effectively reduced, accidents of blockage of a feed port of the vacuum chamber and burnout of a top lance caused by splashing of the molten steel are avoided, and smooth RH refining production is guaranteed. The method is simple and practical, convenient to operate, easy to control and less in investment and has quick response.
Description
Technical field
The invention belongs to steel-making refinery practice technical field, relate in particular to the method that prevents the molten steel splash in a kind of vacuum degassing furnace (being called for short RH) refining process.
Background technology
At present, most steelworkss have all adopted RH liquid steel refining technology, and in the RH molten steel refining technology, if the carbon content in the molten steel is higher, and oxygen level is when also higher, at the vacuum refinement initial stage, the reaction between carbon and oxygen of molten steel can be very violent, so molten steel will produce bigger splash in vacuum chamber, when serious even can stop up feed opening, burn out top gun apparatus etc., thereby the liquid steel refining process is brought very adverse influence.
Up to now, still not having concrete terms of settlement for the problem of molten steel splash in the RH liquid steel refining process, only be to alleviate splash by the method that reduces the lift gas flow on technology controlling and process, but effect is unsatisfactory.
Summary of the invention
Purpose of the present invention is exactly at above-mentioned defective, provides a kind of simple, is convenient to operation, can effectively control the reaction between carbon and oxygen intensity in the molten steel in the RH refining process, reduces the molten steel splash, avoids feed opening to stop up and burn out the method for top rifle accident.
For this reason, the solution that the present invention taked is:
A kind of method of avoiding molten steel splash in the refining process is to be in the RH liquid steel refining process at vacuum degassing furnace, slowly reduces the pressure in the vacuum chamber, suitably adds aluminium and reduces oxygen level in the molten steel, and control decarburizing reaction intensity reduces the molten steel splash; Its concrete grammar is:
1, control vacuum indoor pressure:
The goal pressure of pressure control device is set at 18～22kPa, again goal pressure is set at 8～12kPa behind the decarburization 5min, cancel pressure-controlling behind the decarburization 10min;
2, add deoxidized aluminium:
When the above-mentioned control vacuum indoor pressure method of enforcement still had splash, the ratio adding aluminium according to steel 0.04～0.10kg per ton reduced molten steel oxygen level in the vacuum chamber.
Beneficial effect of the present invention is:
Because the pressure in the vacuum chamber has been carried out syllogic control, the pressure in the vacuum chamber is slowly reduced, until there not being the refining of pressure; And when a little splash occurring, take suitably to add the measure of aluminium again, reduce molten steel oxygen level in the vacuum chamber fast, reaction between carbon and oxygen intensity in the control molten steel, thereby effectively reduced the splash of molten steel in vacuum chamber, prevented that vacuum chamber feed opening that the invar water projection causes from stopping up and the top rifle burns out accident, avoided and reduced causality loss that has guaranteed that the RH refining produces carries out smoothly.The inventive method is simple, is convenient to operation, and easily control is implemented safe and reliablely, need not the more investments of increase and acquires any equipment, just can take effect rapidly.
Embodiment
Below, the invention will be further described in conjunction with the embodiments.
Embodiment 1:
Adopting RH refining tonnage is 250t.
1, vacuum indoor pressure control:
At first, by pressure control device goal pressure is set at 18kPa, slowly reduces vacuum indoor pressure then, behind the decarburization 5min goal pressure is set at 8kPa, control decarburizing reaction intensity is cancelled pressure-controlling behind the decarburization 10min, does not have the pressure refining.
2, the adding of deoxidized aluminium:
When molten steel still has splash after taking above-mentioned control vacuum indoor pressure method, in molten steel, add 10kg aluminium, reduce molten steel oxygen level in the vacuum chamber fast, reduce the molten steel splash.
Embodiment 2:
Adopting RH refining tonnage is 250t.
1, vacuum indoor pressure control:
At first, by pressure control device goal pressure is set at 22kPa, slowly reduces vacuum indoor pressure then, behind the decarburization 5min goal pressure is set at 12kPa, control decarburizing reaction intensity is cancelled pressure-controlling behind the decarburization 10min, does not have the pressure refining.
2, the adding of deoxidized aluminium:
When molten steel still has splash after taking above-mentioned control vacuum indoor pressure method, in molten steel, add 25kg aluminium, reduce molten steel oxygen level in the vacuum chamber fast, reduce the molten steel splash.
Claims (1)
1. a method of avoiding molten steel splash in the refining process is characterized in that, is in the RH liquid steel refining process at vacuum degassing furnace, slowly reduce the pressure in the vacuum chamber, suitably add aluminium and reduce oxygen level in the molten steel, control decarburizing reaction intensity reduces the molten steel splash; Its concrete grammar is:
(1), control vacuum indoor pressure:
The goal pressure of pressure control device is set at 18～22kPa, again goal pressure is set at 8～12kPa behind the decarburization 5min, cancel pressure-controlling behind the decarburization 10min;
(2), add deoxidized aluminium:
When the above-mentioned control vacuum indoor pressure method of enforcement still had splash, the ratio adding aluminium according to steel 0.04～0.10kg per ton reduced molten steel oxygen level in the vacuum chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010209257XA CN102296158A (en) | 2010-06-25 | 2010-06-25 | Method for preventing molten steel from splashing during refining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010209257XA CN102296158A (en) | 2010-06-25 | 2010-06-25 | Method for preventing molten steel from splashing during refining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102296158A true CN102296158A (en) | 2011-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201010209257XA Pending CN102296158A (en) | 2010-06-25 | 2010-06-25 | Method for preventing molten steel from splashing during refining |
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| CN (1) | CN102296158A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225010A (en) * | 2013-04-24 | 2013-07-31 | 山西太钢不锈钢股份有限公司 | Method for preventing molten steel of high nitrogen steel from spraying |
| CN104004887A (en) * | 2014-06-13 | 2014-08-27 | 中天钢铁集团有限公司 | Method for reducing RH vacuum chamber high oxygen content |
| CN106544474A (en) * | 2015-09-17 | 2017-03-29 | 鞍钢股份有限公司 | A kind of method of operating of medium high carbon steel grade vacuum chamber quick change |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410559A (en) * | 2002-11-25 | 2003-04-16 | 武汉钢铁(集团)公司 | Method of producing super low carbon steel using vacuum degassing |
| CN101058837A (en) * | 2007-05-30 | 2007-10-24 | 山西太钢不锈钢股份有限公司 | Smelting method for decarburization and denitrogenation of ultra-pure ferrite stainless steel |
-
2010
- 2010-06-25 CN CN201010209257XA patent/CN102296158A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410559A (en) * | 2002-11-25 | 2003-04-16 | 武汉钢铁(集团)公司 | Method of producing super low carbon steel using vacuum degassing |
| CN101058837A (en) * | 2007-05-30 | 2007-10-24 | 山西太钢不锈钢股份有限公司 | Smelting method for decarburization and denitrogenation of ultra-pure ferrite stainless steel |
Non-Patent Citations (4)
| Title |
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| 刘良田: "RH真空脱碳的实践", 《炼钢》 * |
| 王殿录: "用RH真空脱气设备处理低碳硅钢", 《真空科学与技术》 * |
| 赵云珠: "本钢RH生产超低碳钢过程碳成分控制实践", 《2008年全国炼钢-连铸生产技术会议文集》 * |
| 陆世英等: "《不锈钢》", 30 November 1998, 原子能出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225010A (en) * | 2013-04-24 | 2013-07-31 | 山西太钢不锈钢股份有限公司 | Method for preventing molten steel of high nitrogen steel from spraying |
| CN104004887A (en) * | 2014-06-13 | 2014-08-27 | 中天钢铁集团有限公司 | Method for reducing RH vacuum chamber high oxygen content |
| CN104004887B (en) * | 2014-06-13 | 2016-02-10 | 中天钢铁集团有限公司 | A kind of method reducing RH vacuum chamber elevated oxygen level |
| CN106544474A (en) * | 2015-09-17 | 2017-03-29 | 鞍钢股份有限公司 | A kind of method of operating of medium high carbon steel grade vacuum chamber quick change |
| CN106544474B (en) * | 2015-09-17 | 2018-11-06 | 鞍钢股份有限公司 | A kind of operating method of medium high carbon steel grade vacuum chamber quick change |
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Application publication date: 20111228 |