CN104004887B - A kind of method reducing RH vacuum chamber elevated oxygen level - Google Patents
A kind of method reducing RH vacuum chamber elevated oxygen level Download PDFInfo
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- CN104004887B CN104004887B CN201410266161.5A CN201410266161A CN104004887B CN 104004887 B CN104004887 B CN 104004887B CN 201410266161 A CN201410266161 A CN 201410266161A CN 104004887 B CN104004887 B CN 104004887B
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Abstract
The invention discloses a kind of method reducing RH vacuum chamber elevated oxygen level, concrete steps are as follows: by the molten steel handling after deoxidation heats up to RH vacuum refining furnace; Buggy ladle transports ladle molten steel to vacuum-treat position jacking ladle and buggy ladle; Open vacuum pump system and carry out vacuum-treat; Vacuumize molten steel and start circulation, process first gently processes early stage, and vacuum tightness remains between 10KPa-20KPa; Circulation later stage vacuum chamber rocks and is tending towards normal, and ladle liquid level is steady, and tail gas CO concentration is normal; After cleaning, carry out special steel grade vacuum refinement.The invention solves to cause because vacuum chamber oxygen level is high that oxygen level rises, steel oxidation thing is mingled with and increases problem, promotes Molten Steel Cleanliness, reduce because phenomenon scrapped by the Molten Steel Cleanliness difference abnormal strand that causes casting.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of method reducing RH vacuum chamber elevated oxygen level.
Background technology
In field of metallurgy, because after the certain heat of RH vacuum-treat aluminium killed steel, the cold steel of inevitable generation is collected in vacuum chamber, gather for preventing cold steel and affect vacuum apparatus operation too much, generally process 40-50 heat or long-time stop using time need carry out vacuum chamber oxygen blast and melt smelting cold steel and carry out operation of releasing, release and terminate final vacuum room meeting nubbin oxidisability slag.When again carrying out molten steel vacuum-treat, RH stove is released and new vacuum chamber oxidizing substance can have an impact to molten steel, when major embodiment is RH vacuum-treat there is larger change and cause as Elements C, Si, Al and oxygen level raise refining slag to foam the phenomenons such as blackening in the composition of molten steel, to release final vacuum process composition changing conditions % in Table 1RH stove.
Table 1
For the change of composition and oxygen level, analyzing major cause is wherein leave C, Si, Mn, Al in a large amount of residue higher containing oxygen and molten steel after vacuum chamber is released to react and cause, after making process, molten steel is polluted, show that vacuum chamber causes composition and oxygen level to occur extremely because there is residual oxygen voltinism slag by contrast, thus affect steel product quality and Composition Control.
Summary of the invention
In order to overcome prior art Problems existing, the object of this invention is to provide a kind of method reducing RH vacuum chamber elevated oxygen level, the method can solve RH vacuum refinement and cause because vacuum chamber oxygen level is high that oxygen level rises, steel oxidation thing is mingled with and increases problem, promote special steel particularly aluminium killed steel Molten Steel Cleanliness, reduce treating processes aluminium to damage, reduce because phenomenon scrapped by the Molten Steel Cleanliness difference abnormal strand that causes casting.
Object of the present invention is achieved through the following technical solutions:
Reduce a method for RH vacuum chamber elevated oxygen level, it is characterized in that: the method is cleaned vacuum chamber before carrying out vacuum refinement to special steel grade, and concrete steps are as follows:
1) by the molten steel handling after deoxidation heats up to RH vacuum refining furnace;
2) buggy ladle transports ladle molten steel to vacuum-treat position jacking ladle and buggy ladle;
3) open vacuum pump system and carry out vacuum-treat;
4) vacuumize molten steel and start circulation, process first gently processes early stage, and vacuum tightness remains between 10KPa-20KPa; In the molten steel of the interior remaining oxidisability slag of vacuum chamber and circulation in treating processes, oxidizable element aluminum, carbon, silicon, manganese constantly react, now vacuum chamber has shaking phenomenon, bloating, the tail gas CO concentration of process is high, be generally about 30%-40%, if vacuum tightness is Gao Keda 70% comparatively, rock more violent, when CO concentration is 1%-2% after gas clean-up, illustrate that reaction between carbon and oxygen terminates;
5) the later stage vacuum chamber that circulates rocks and is tending towards normal, and ladle liquid level is steady, and tail gas CO concentration is normal, i.e. tail gas CO concentration < 2%;
6), after cleaning, special steel grade vacuum refinement is carried out.
The molten steel being used in the present invention cleaning is common molten steel, is different from the general steel shown in molten steel established technology regulation of the special steels such as spring steel, bearing steel, abrading-ball steel and large round billet forging steel or the excellent steel without particular requirement.Step 6) in, the interval time of special steel grade vacuum refinement is no more than 3 hours, otherwise need re-start above step.
The present invention is when smelting special steel grade, and before vacuum refinement, use common steel grade to carry out vacuum chamber cleaning, compared with prior art, tool has the following advantages:
1, solve RH vacuum refinement and cause composition unusual phenomenon because vacuum chamber oxygen level is high, namely oxidizable element causes composition to reduce as C, Si, Mn, Al, Ti etc. and the oxygen in vacuum chamber react and does not meet and process steel grades requirement;
2, solve that RH vacuum refinement causes because vacuum chamber oxygen level is high that oxygen level rises, steel oxidation thing is mingled with and increases problem;
3, promote special steel particularly aluminium killed steel Molten Steel Cleanliness, reduce treating processes aluminium and damage;
4, promote the castability of special steel particularly aluminium killed steel molten steel casting process, reduce because phenomenon scrapped by the Molten Steel Cleanliness difference abnormal strand that causes casting;
5, the quality objection because RH vacuum processing of liquid steel purity difference causes has been stopped.
Embodiment
Reduce a method for RH vacuum chamber elevated oxygen level, first clean vacuum chamber before carrying out vacuum refinement to special steel grade, concrete steps are as follows:
The first step, by the common molten steel handling after deoxidation heats up to RH vacuum refining furnace;
Second step, buggy ladle transports ladle molten steel to vacuum-treat position jacking ladle and buggy ladle;
3rd step, opens vacuum pump system and carries out vacuum-treat;
4th step, vacuumizes molten steel and starts circulation, and process first gently processes early stage, and vacuum tightness remains between 10KPa-20KPa; In the molten steel of the interior remaining oxidisability slag of vacuum chamber and circulation in treating processes, oxidizable element aluminum, carbon, silicon, manganese etc. constantly react, now vacuum chamber has shaking phenomenon, bloating, the tail gas CO concentration of process is higher, be generally about 30%-40%, if vacuum tightness is Gao Keda 70% comparatively, rock more violent;
5th step, circulation later observations vacuum chamber rocks and is tending towards normal, and ladle liquid level is steady, and tail gas CO concentration is normal, illustrates that reaction between carbon and oxygen terminates to carry out present treatment when namely CO concentration is less than 2%;
6th step, follow-up special steel grade vacuum refinement can be carried out in cleaning final vacuum room, but should not surpass 3 hours interval time otherwise need re-start above step.
LF refining furnace can be returned to the general steel after clean vacuum chambers again carry out refining operation or directly cast.In process of production, every 50 stoves clean a vacuum chamber, can keep Molten Steel Cleanliness, solve RH vacuum refinement and cause composition unusual phenomenon because vacuum chamber oxygen level is high.
After vacuum chamber cleaning, oxygen level is controlled, and can find out that larger change does not all occur in the element determinations such as carbon before and after vacuum-treat, aluminium, silicon, manganese, oxygen from table 2 composition, and illustrate that vacuum chamber cleaning performance is good, vacuum refining molten steel purity is guaranteed.
Table 2
Claims (3)
1. reduce a method for RH vacuum chamber elevated oxygen level, it is characterized in that: the method is cleaned vacuum chamber before carrying out vacuum refinement to special steel grade, and concrete steps are as follows:
1) by the molten steel handling after deoxidation heats up to RH vacuum refining furnace; Described molten steel is common molten steel, and common molten steel refers to the molten steel being different from spring steel, bearing steel, abrading-ball steel and large round billet forging special steel, the general steel shown in established technology regulation or the excellent steel without particular requirement;
2) buggy ladle transports ladle molten steel to vacuum-treat position jacking ladle and buggy ladle;
3) open vacuum pump system and carry out vacuum-treat;
4) vacuumize molten steel and start circulation, process first gently processes early stage, and vacuum tightness remains between 10KPa-20KPa; In the molten steel of the interior remaining oxidisability slag of vacuum chamber and circulation in treating processes, oxidizable element aluminum, carbon, silicon, manganese constantly react, and now vacuum chamber has shaking phenomenon, bloating, and the tail gas CO concentration of process is high;
5) the later stage vacuum chamber that circulates rocks and is tending towards normal, and ladle liquid level is steady, reaches tail gas CO concentration < 2%;
6), after cleaning, special steel grade vacuum refinement is carried out.
2. the method for reduction RH vacuum chamber elevated oxygen level according to claim 1, it is characterized in that: in step 4), CO concentration is 30%-40%, if vacuum tightness height CO concentration can reach 70%, rock more violent, when CO concentration is < 2% after gas clean-up, illustrate that reaction between carbon and oxygen terminates.
3. the method for reduction RH vacuum chamber elevated oxygen level according to claim 1, it is characterized in that: in step 6), the interval time of special steel grade vacuum refinement is no more than 3 hours.
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| CN201410266161.5A CN104004887B (en) | 2014-06-13 | 2014-06-13 | A kind of method reducing RH vacuum chamber elevated oxygen level |
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| CN201410266161.5A CN104004887B (en) | 2014-06-13 | 2014-06-13 | A kind of method reducing RH vacuum chamber elevated oxygen level |
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| CN104004887B true CN104004887B (en) | 2016-02-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104988280A (en) * | 2015-05-27 | 2015-10-21 | 北京首钢股份有限公司 | Method for lowering oxygen activity of steel with oxygen before aluminum feeding |
| CN111088453B (en) * | 2020-01-08 | 2021-05-14 | 柳州钢铁股份有限公司 | Control method for acid-soluble aluminum in SWRH82B steel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06116626A (en) * | 1991-07-04 | 1994-04-26 | Nippon Steel Corp | Method for smelting low carbon steel by using vacuum refining furnace |
| CN102296158A (en) * | 2010-06-25 | 2011-12-28 | 鞍钢股份有限公司 | Method for preventing molten steel from splashing in refining process |
| CN102296159A (en) * | 2010-06-25 | 2011-12-28 | 鞍钢股份有限公司 | Method for treating blockage of insertion tube |
| CN102477477A (en) * | 2010-11-30 | 2012-05-30 | 攀钢集团钢铁钒钛股份有限公司 | Vacuum refining method of molten steel |
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- 2014-06-13 CN CN201410266161.5A patent/CN104004887B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06116626A (en) * | 1991-07-04 | 1994-04-26 | Nippon Steel Corp | Method for smelting low carbon steel by using vacuum refining furnace |
| CN102296158A (en) * | 2010-06-25 | 2011-12-28 | 鞍钢股份有限公司 | Method for preventing molten steel from splashing in refining process |
| CN102296159A (en) * | 2010-06-25 | 2011-12-28 | 鞍钢股份有限公司 | Method for treating blockage of insertion tube |
| CN102477477A (en) * | 2010-11-30 | 2012-05-30 | 攀钢集团钢铁钒钛股份有限公司 | Vacuum refining method of molten steel |
Non-Patent Citations (1)
| Title |
|---|
| RH真空精炼原理及工艺简介;孙利顺;《河北省冶金学会2008年炼钢连铸技术与学术交流会论文集》;20081231;第371页第5-6段 * |
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