CN101565771A - Calcium treatment method for molten steel in steel making - Google Patents
Calcium treatment method for molten steel in steel making Download PDFInfo
- Publication number
- CN101565771A CN101565771A CNA2009100686778A CN200910068677A CN101565771A CN 101565771 A CN101565771 A CN 101565771A CN A2009100686778 A CNA2009100686778 A CN A2009100686778A CN 200910068677 A CN200910068677 A CN 200910068677A CN 101565771 A CN101565771 A CN 101565771A
- Authority
- CN
- China
- Prior art keywords
- molten steel
- steel
- calcium
- impurities
- inclusion
- 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.)
- Granted
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a calcium treatment method for molten steel in steel making, which comprises the steps of: melting steel in an electric furnace, tapping and pre-deoxidizing, conducting calcium treatment to the molten steel and stirring to cause impurities to float up. After the calcium treatment, the compound impurities in the molten steel is easy to float up after being stirred; the impurities with a diameter less than 10 mum, which collide with each other and grow up with bottom argon stirring in the course of refining, can also float up and be eliminated . The method has the advantages that the adoption of calcium treatment method for molten steel in steel making plays a good role in reducing the impurities in the molten steel; the impurities super-long heat is obviously reduced from originally 6-10 furnaces per month to currently less than 2 furnaces per month; the rating of class-B impurities decrease totally; level 0 and level 0.5 together account for 97.2%; B refinement is average 0.07; the impurities control level is obviously improved; and quality problems caused by impurities are greatly reduced. As the waste caused by impurities every year is not less than 500 tons, the method can greatly reduce waste quantity and remarkably increase economic benefits.
Description
Technical field
The present invention relates to a kind of calcium treating method of molten steel in steel making.
Background technology
Steel-making calcium treating processes generally is to finish the weak then certain hour that stirs of a certain amount of silico-calcium silk of feeding in molten steel in refining treatment at present, and purpose is that inclusion modification in the molten steel is handled, and by solid-state liquefy, makes inclusion floating be convenient to remove.But the careless slightly calcium of molten steel that just can cause is dealt with improperly, and the amount itself that calcium is handled just is not easy to hold, and can cause following consequence like this:
The one, when the calcium add-on is too low, may form CA6 and CA2, these solid inclusions ratio aluminum oxides are more tough and tensile; The 2nd, it is too big that calcium is handled intensity, because the vapour pressure of calcium is very big, will causes the molten steel surface to seethe and cause secondary oxidation, stirring intensity is excessive, cause and ladle slag between reaction, cause Ca and Mg in the slag or in the refractory materials to be delivered in the molten steel, form magnesium-aluminium spinel and be mingled with.
Summary of the invention
For solving the problem that exists in the above-mentioned technology, the calcium treating method that the purpose of this invention is to provide a kind of molten steel in steel making, purpose is to maximize favourable factors and minimize unfavourable ones, the strong point that performance calcium is handled, promptly change inclusion morphology, its easier come-up is removed, eliminate the drawback that calcium is handled simultaneously, prevent to deal with pollution and the adverse consequences that causes molten steel improperly, reach the purpose that improves the molten steel purity because of calcium.
For achieving the above object, technical solution of the present invention provides a kind of calcium treating method of molten steel in steel making, and this method includes following steps:
1., electrosmelting
Electric furnace conducts heat by electrode arc and the wall lance oxygen blast will be that raw material is fused into crude molten steel with steel scrap, molten iron, and removes unnecessary carbon and phosphorus in the molten steel, and reaction process is as follows:
[C]+[O]＝{CO} (1)
[C]+[FeO]＝[Fe]+{CO} (2)
2[P]+8(FeO)＝(3FeO·P2O5)+5[Fe] (3)
2., tapping and pre-deoxidation
Above-mentioned crude molten steel is transferred to ladle from electric furnace, needs the molten steel that contains a large amount of dissolved oxygens in the molten steel is carried out deoxidation treatment, carries out secondary refining; In ladle, add earlier aluminium, silicon, calcium, manganese alloy before the tapping, pour the electric furnace molten steel into ladle then, fully react by oxygen and deoxidant element in the argon gas stirring molten steel at the bag end, dissolved oxygen sharply reduces in the steel, formed the oxide compound particle, these oxide compound particles are the impurity in the steel, need by certain means its major part to be removed, and the reaction formula is;
[Al，Si，Ca，Mn]+[O]→(Al2O3，SiO2，CaO，MnO) (4)
3., molten steel calcium is handled
Make dissolved oxygen reduction in the molten steel through above-mentioned pre-deoxidation, but still remnants have a large amount of deoxidation productss, feed a certain amount of calcium silk to described molten steel this moment and carry out the calcium processing, inclusion in the molten steel is carried out sex change, become the compound state inclusion by the simple substance attitude, by the solid-state low melting point liquid inclusions that becomes, to be convenient to its come-up and to remove, its reaction process is as follows:
[Ca]+[S]＝(CaS) (5)
x[Ca]+y<Al2O3>＝<xCaO·(y-x/3)Al
2O
3>+2x/3[Al] (6)
4., stir come-up
After the calcium processing, the compound state inclusion is easy to come-up through stirring in the above-mentioned molten steel, stirs by the argon bottom-blowing in the refining process for the inclusion below the diameter 10um, and inclusion collides mutually grows up, the removal of finally also floating.
Effect of the present invention is to adopt the calcium treating method of molten steel in steel making to have inclusion effect in the good reduction molten steel, inclusion overlength heat obviously reduces, be reduced to by former every month 6 ~ 10 stove and be not more than 2 stoves in present every month, the grading of category-B inclusion is overall to be reduced, 0 grade+0.5 grade accounts for 97.2%, B thin average 0.07, the Control and Inclusion Removal level obviously improves, also significantly reduce the quality problems that cause because of inclusion, the annual waste product that causes because of inclusion is no less than 500 tons, the amount of reducing the number of rejects and seconds greatly, its economic benefit obviously improves.
Description of drawings
Fig. 1 is the add-on of Ca of the present invention and the graph of a relation between the steel inclusion form.
Embodiment
Reaching embodiment in conjunction with the accompanying drawings is illustrated the calcium treating method of molten steel in steel making of the present invention.
As shown in Figure 1, the calcium treating method of molten steel in steel making of the present invention includes following steps:
1., electrosmelting
Electric furnace conducts heat by electrode arc and the wall lance oxygen blast will be that raw material is fused into crude molten steel with steel scrap, molten iron, and removes unnecessary carbon and phosphorus in the molten steel, and reaction process is as follows:
[C]+[O]＝{CO} (1)
[C]+[FeO]＝[Fe]+{CO} (2)
2[P]+8(FeO)＝(3FeO·P2O5)+5[Fe]?(3)
2., tapping and pre-deoxidation
Above-mentioned crude molten steel is transferred to ladle from electric furnace, needs the molten steel that contains a large amount of dissolved oxygens in the molten steel is carried out deoxidation treatment, carries out secondary refining; In ladle, add earlier aluminium, silicon, calcium, manganese alloy before the tapping, pour the electric furnace molten steel into ladle then, fully react by oxygen and deoxidant element in the argon gas stirring molten steel at the bag end, dissolved oxygen sharply reduces in the steel, formed the oxide compound particle, these oxide compound particles are the impurity in the steel, need by certain means its major part to be removed, and the reaction formula is;
[Al，Si，Ca，Mn]+[O]→(Al2O3，SiO2，CaO，MnO) (4)
3., molten steel calcium is handled
Make dissolved oxygen reduction in the molten steel through above-mentioned pre-deoxidation, but still remnants have a large amount of deoxidation products Al2O3, feed a certain amount of calcium silk to described molten steel this moment and carry out the calcium processing, inclusion in the molten steel is carried out sex change, become the compound state inclusion by the simple substance attitude, by the solid-state low melting point liquid inclusions that becomes, to be convenient to its come-up and to remove, its reaction process is as follows:
[Ca]+[S]＝(CaS) (5)
x[Ca]+y<Al2O3>＝<xCaO·(y-x/3)Al
2O
3>+2x/3[Al] (6)
When the add-on of calcium metal was 0.001%, reactant was dystectic CaO6Al2O3; When the calcium metal add-on was 0.005%～0.02%, reactant was higher melt CaOAl2O3 and CaS; When the calcium metal add-on was 0.03%, reactant was low melting point 3CaOAl2O3; When the calcium metal add-on was 0.04%, reactant was high-melting-point CaO and CaS.Sulphur content is also influential to inclusion in the steel in addition, and sulphur content is low more in the steel, and the add-on that forms the required calcium metal of low-melting calcium aluminate is few more.
So form the ideal inclusion morphology, the add-on of calcium metal needs decide according to on-site actual situations, the amount that generally feeds the calcium silk be in the molten steel inclusion 0.02%～0.03%.
4., stir come-up
After the removal degree of deoxidation products from steel mainly handled by calcium, the compound state inclusion was easy to come-up through stirring in the above-mentioned molten steel, stirs by the argon bottom-blowing in the refining process for the inclusion below the diameter 10um, promotes inclusion floating.Inclusion collides mutually grows up, and the removal of finally also floating reaches the purpose of molten steel cleaning.
Claims (2)
1, a kind of calcium treating method of molten steel in steel making, this method includes following steps:
1., electrosmelting
Electric furnace conducts heat by electrode arc and the wall lance oxygen blast will be that raw material is fused into crude molten steel with steel scrap, molten iron, and removes unnecessary carbon and phosphorus in the molten steel, and reaction process is as follows:
[C]+[O]＝{CO} (1)
[C]+[FeO]＝[Fe]+{CO} (2)
2[P]+8(FeO)＝(3FeO·P2O5)+5[Fe] (3)
2., tapping and pre-deoxidation
Above-mentioned crude molten steel is transferred to ladle from electric furnace, needs the molten steel that contains a large amount of dissolved oxygens in the molten steel is carried out deoxidation treatment, carries out secondary refining; In ladle, add earlier aluminium, silicon, calcium, manganese alloy before the tapping, pour the electric furnace molten steel into ladle then, fully react by oxygen and deoxidant element in the argon gas stirring molten steel at the bag end, dissolved oxygen sharply reduces in the steel, formed the oxide compound particle, these oxide compound particles are the impurity in the steel, need by certain means its major part to be removed, and the reaction formula is;
[Al，Si，Ca，Mn]+[O]→(Al2O3，SiO2，CaO，MnO)(4)
3., molten steel calcium is handled
Make dissolved oxygen reduction in the molten steel through above-mentioned pre-deoxidation, but still remnants have a large amount of deoxidation productss, feed a certain amount of calcium silk to described molten steel this moment and carry out the calcium processing, inclusion in the molten steel is carried out sex change, become the compound state inclusion by the simple substance attitude, by the solid-state low melting point liquid inclusions that becomes, to be convenient to its come-up and to remove, its reaction process is as follows:
[Ca]+[S]＝(CaS) (5)
x[Ca]+y＜Al2O3＞＝＜xCaO·(y-x/3)Al
2O
3＞+2x/3[Al](6)
4., stir come-up
After the calcium processing, the compound state inclusion is easy to come-up through stirring in the above-mentioned molten steel, stirs by the argon bottom-blowing in the refining process for the inclusion below the diameter 10um, and inclusion collides mutually grows up, the removal of finally also floating.
2, the calcium treating method of molten steel in steel making according to claim 1 is characterized in that: described step during 3. molten steel calcium is handled to the amount of described molten steel feeding calcium silk be in the molten steel inclusion 0.02%～0.03%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100686778A CN101565771B (en) | 2009-04-29 | 2009-04-29 | Calcium treatment method for molten steel in steel making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100686778A CN101565771B (en) | 2009-04-29 | 2009-04-29 | Calcium treatment method for molten steel in steel making |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101565771A true CN101565771A (en) | 2009-10-28 |
| CN101565771B CN101565771B (en) | 2011-01-19 |
Family
ID=41282132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100686778A Active CN101565771B (en) | 2009-04-29 | 2009-04-29 | Calcium treatment method for molten steel in steel making |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101565771B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962702A (en) * | 2010-10-22 | 2011-02-02 | 首钢总公司 | Method for controlling non-metallic inclusions in steel |
| CN103194573A (en) * | 2013-03-29 | 2013-07-10 | 攀钢集团成都钢钒有限公司 | Method for treating molten steel calcium, composite calcium line and method for manufacturing steel |
| CN105331776A (en) * | 2014-08-08 | 2016-02-17 | 上海梅山钢铁股份有限公司 | Calcium treatment method of ultra-low-carbon and high-aluminum steel |
| CN105378118A (en) * | 2013-07-10 | 2016-03-02 | 杰富意钢铁株式会社 | Method for producing steel material |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1247799C (en) * | 2004-12-10 | 2006-03-29 | 宝钢集团上海五钢有限公司 | Production method for reducing and fining the high-carbon chromium bearing steel D-type impurity |
| CN100525953C (en) * | 2005-12-26 | 2009-08-12 | 天津钢管集团股份有限公司 | Technique for preventing surface crack of continuous casting steel billet for petroleum casing |
-
2009
- 2009-04-29 CN CN2009100686778A patent/CN101565771B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962702A (en) * | 2010-10-22 | 2011-02-02 | 首钢总公司 | Method for controlling non-metallic inclusions in steel |
| CN103194573A (en) * | 2013-03-29 | 2013-07-10 | 攀钢集团成都钢钒有限公司 | Method for treating molten steel calcium, composite calcium line and method for manufacturing steel |
| CN103194573B (en) * | 2013-03-29 | 2014-10-01 | 攀钢集团成都钢钒有限公司 | Method for treating molten steel calcium, composite calcium line and method for manufacturing steel |
| CN105378118A (en) * | 2013-07-10 | 2016-03-02 | 杰富意钢铁株式会社 | Method for producing steel material |
| US10072320B2 (en) | 2013-07-10 | 2018-09-11 | Jfe Steel Corporation | Method of producing steel material |
| CN105331776A (en) * | 2014-08-08 | 2016-02-17 | 上海梅山钢铁股份有限公司 | Calcium treatment method of ultra-low-carbon and high-aluminum steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101565771B (en) | 2011-01-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2765475C1 (en) | Method for production of acid-resistant high purity pipeline steel | |
| CN110177889B (en) | Molten steel desulfurization treatment method and desulfurizing agent | |
| CN102304606B (en) | Slag former and slagging method for semisteel steelmaking | |
| CN102199684B (en) | Production method of ultralow-oxygen titanium-containing ferrite stainless steel | |
| CN104212935B (en) | A kind of method with high titanium ferrochrome production high-quality GCr15 bearing steel | |
| Abdelaziz et al. | Control of Ca addition for improved cleanness of low C, Al killed steel | |
| CN103045928A (en) | Method for producing ferrovanadium by aluminothermic process | |
| CN101993974B (en) | Method for preparing pure iron with extremely low gas content | |
| CN101565771B (en) | Calcium treatment method for molten steel in steel making | |
| CN109777918A (en) | A kind of external refining production method refining high-carbon-chromium bearing steel inclusion particle | |
| CN105420445A (en) | Method for smelting coarse-grained steel | |
| CN102329917B (en) | Production method of clean steel | |
| CN113774180A (en) | Control method for oxide inclusions of high-silicon series spring steel | |
| JP2015178646A (en) | Method of forming ingot of low-sulfur steel | |
| CN113278762A (en) | Ca alloying method in high-aluminum calcium sulfur composite free-cutting steel | |
| CN113005261A (en) | Comprehensive deoxidation and desulfurization process for smelting stainless steel by using small-capacity AOD furnace | |
| JP5891826B2 (en) | Desulfurization method for molten steel | |
| CN112322958A (en) | Low-carbon aluminum-containing steel and smelting control method thereof | |
| CN102373316B (en) | Control method of slag system of ladle refining furnace | |
| CN101054613A (en) | Fluxing agent for prerefining molten steel during tapping process | |
| CN114292984B (en) | LF refining slag component research [ Mn ] [ Si ] element RC process method | |
| CN103225009A (en) | Method for producing high-cleanness steel | |
| CN106811573A (en) | Improve the manufacture method of the steel of molten steel casting properties | |
| RU2566230C2 (en) | Method of processing in oxygen converter of low-siliceous vanadium-bearing molten metal | |
| CN1284868C (en) | Composite deoxidant silicon aluminium barium calcium manganese iron ally for steel making and its preparation method |
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 | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190625 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee before: Tianjin Steel Pipe Group Co., Ltd. |
|
| TR01 | Transfer of patent right |