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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
vacuum
steel
molten steel
vacuum chamber
ladle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201410266161.5A
Other languages
Chinese (zh)
Other versions
CN104004887A (en
Inventor
张正林
叶玉奎
仝太钦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zenith Steel Group Co Ltd
Original Assignee
Zenith Steel Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zenith Steel Group Co Ltd filed Critical Zenith Steel Group Co Ltd
Priority to CN201410266161.5A priority Critical patent/CN104004887B/en
Publication of CN104004887A publication Critical patent/CN104004887A/en
Application granted granted Critical
Publication of CN104004887B publication Critical patent/CN104004887B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Treatment Of Steel In Its Molten State (AREA)

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

A kind of method reducing RH vacuum chamber elevated oxygen level
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.
CN201410266161.5A 2014-06-13 2014-06-13 A kind of method reducing RH vacuum chamber elevated oxygen level Active CN104004887B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410266161.5A CN104004887B (en) 2014-06-13 2014-06-13 A kind of method reducing RH vacuum chamber elevated oxygen level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410266161.5A CN104004887B (en) 2014-06-13 2014-06-13 A kind of method reducing RH vacuum chamber elevated oxygen level

Publications (2)

Publication Number Publication Date
CN104004887A CN104004887A (en) 2014-08-27
CN104004887B true CN104004887B (en) 2016-02-10

Family

ID=51365793

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410266161.5A Active CN104004887B (en) 2014-06-13 2014-06-13 A kind of method reducing RH vacuum chamber elevated oxygen level

Country Status (1)

Country Link
CN (1) CN104004887B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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 *

Also Published As

Publication number Publication date
CN104004887A (en) 2014-08-27

Similar Documents

Publication Publication Date Title
CN103741006B (en) A kind of preparation method containing the low nitrogen stainless steel of Ti
CN104212934A (en) Control method for titanium nitride inclusion of gear steel bar material
CN103773917B (en) The smelting process of vanadium-bearing hot metal vanadium extraction steel-making
CN105316573B (en) 80-grade cord steel wire rod suitable for acid pickling and descaling and production method thereof
CN102418041B (en) Production method for bearing steel
CN104561697B (en) A kind of method that direct use electrolytic aluminium liquid bottom pouring type casting and roll process produces pop can tank material
CN107012282A (en) Method for improving purity of high-quality ultra-low carbon steel
CN104004887B (en) A kind of method reducing RH vacuum chamber elevated oxygen level
JP2012241229A (en) Method of manufacturing high-fatigue strength steel cast slab
CN103394826B (en) A kind of process reducing extruded rod defect
US20240287635A1 (en) Method for preparing titanium-containing ultra-low-carbon steel
JP2015209586A (en) Ingot formation method of high-s low-n steel alloy
CN103938002B (en) A kind of Cu-Cr-Zr alloy casting rod reduces the vacuum melting technique of segregation
CN102051439B (en) Method for smelting high aluminium steel
CN101633974B (en) Smelting process of ultra low oxygen steel
CN103451507B (en) Method for reducing inclusion defect rate of cold-rolled automobile sheet
CN110079688A (en) A kind of method of molten aluminum holding furnace automatic refining processing
JP7126103B2 (en) Melting method of high manganese steel
Chen et al. Optimization of calcium addition to high-strength low-alloy steels
JP2008229649A (en) Method for casting alloy, and die-cast member
CN103525977A (en) Dehydrogenation method
JP2019526708A (en) Alloy steel manufacturing method
CN101469369B (en) Composite additive for electroslag remelted alloy tool and die steel and adding method thereof
CN106544474B (en) Operation method for quickly changing medium-high carbon steel vacuum chamber
RU2569621C1 (en) Method of producing niobium-containing steel

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant