CN1220316A - Molten steel refining technology - Google Patents
Molten steel refining technology Download PDFInfo
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- CN1220316A CN1220316A CN 98125048 CN98125048A CN1220316A CN 1220316 A CN1220316 A CN 1220316A CN 98125048 CN98125048 CN 98125048 CN 98125048 A CN98125048 A CN 98125048A CN 1220316 A CN1220316 A CN 1220316A
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- heart yearn
- molten steel
- feeding
- calcium
- ladle
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to a refining process for molten steel, including the following procedures: 1. in the course of that the RH buggy ladle is going to RH treatment station, bottom-blowing Ar stirring pretreatment; 2. in the course of RH treatment, when molten steel F(O) is less than or equal to 20 ppm, feeding composite desulfurization cored wire in the ladle to make desulfurization treatement; and 3. at the same time of ending RH treatment and damaging vacuum in vacuum tank, feeding CaSi cored wire into the ladle to make calcium treatment or after the RH treatment is ended and sampled for measuring temp., at the same time of blowing Ar, instantly feeding CaSi cored wire to make calcium treatment. Said invention not only can shorten the production period, reduce nitrogen pick-up and temp. drop, but also can raise calcium yield.
Description
The present invention relates to a kind of molten steel refining technology, belong to the treatment process of fusion iron class alloy.
Along with the raising that the user requires steel quality, Steel Plant both domestic and external are all making great efforts to improve the concise ratio of molten steel.Therefore, except that molten steel being carried out vacuum circulation degassing handles, be the form of sulphur content and inclusion in the control steel, also to carry out powder injection desulphurization mostly and dust adding calcium and handling.The method of available technology adopting is: handle at vacuum circulation degassing-be in the RH treating processes, CaO/CaF jets in vacuum tank
2Deng powder desulfurization; After the RH processing finishes, with the ladle handling to the station of dusting, off-line winding-up calcium alloy powder.Its existing problem is: powder injection desulphurization system floor space is big, investment and maintenance cost height, and the treating processes temperature drop is big; Off-line adds calcium, causes the production cycle long, and nitrogen pick-up is serious.Japanese patent laid-open 8-333619 discloses a kind of " manufacture method of corrosion-resistant high-quality steel ", in the RH treating processes, when whole oxygen amount 20ppm is following in the molten steel, sprays into the calcium alloy powder or adds the calcium alloy heart yearn, is mingled with form to improve calm degree and to control.Because the boiling point of calcium is lower, has only 1484 ℃, as easy as rolling off a log volatilization is taken away under the vacuum-treat condition, causes the calcium recovery rate quite low, when sulphur content in the molten steel is high slightly, and also wayward inclusion morphology.
The purpose of this invention is to provide and a kind ofly can shorten the production cycle, reduce the treating processes nitrogen increased amount, reduce temperature drop, can improve the molten steel refining technology of the recovery rate of calcium again.
The objective of the invention is to realize by following technical solution.
A kind of molten steel refining technology comprises that vacuum circulation degassing is that RH handles, and has following technological process:
1) leaves for RH at RH ladle chassis and handle in the station process, carry out bottom blowing Ar and stir pre-treatment;
2) in the RH treating processes, molten steel F[O]≤during 20ppm, feeding composite desulfate heart yearn carries out desulfurization and handles in ladle;
3) when the RH processing finishes vacuum tank destruction vacuum, feeding CaSi heart yearn carries out the calcium processing in ladle, or after the RH processing finishes the thermometric sampling, feeds the CaSi heart yearn immediately and carry out the calcium processing when blowing Ar.
Blow Ar and stir pre-treatment, it blows Ar pressure 0.6～1.0MPa, blows Ar intensity 150～500NL/min, pretreatment time 2～4min.
The proportioning raw materials of composite desulfate heart yearn core pulvis is: the lime powder 55～75% (weight) of CaO 〉=90%, CaF
2〉=85%, SiO
2≤ 8% fluorite powder 15～35% (weight), Al
2O
3〉=80%, SiO
2≤ 10% bauxitic clay 10～20% (weight), granularity≤1mm, its outer cladding has iron sheet; Heart yearn feeds in ladle by the soaking tub of 500～700mm in the immersion molten steel of feeding wire machine, the feeding degree of depth be positioned at upcast lower end 800mm with, near the molten steel rises stream burst district of bag wall, feed quantity is: 4～6 kilograms of steel feeding core pulvis net weight per ton.The diameter of composite desulfate heart yearn is 16～20mm, generally adopts double-current heart yearn to feed simultaneously, feeding speed 100～150m/min.
The core calcium content of CaSi heart yearn is a core pulvis calcium content 28～32% (weight), and its outer cladding has iron sheet, and feed quantity is: 0.6～1.0 kilogram of steel feeding core pulvis net weight per ton.The diameter of CaSi heart yearn is 13～16mm, but can adopt double-current heart yearn to feed also single current heart yearn feeding, feeding speed 160～220m/min simultaneously.
When feeding the calcium treating method of CaSi heart yearn when adopting the RH processing to finish thermometric sampling after-blow Ar, it blows Ar pressure 0.6～1.0MPa, blows Ar intensity 150～300NL/min, and line feeding continues to blow Ar2～6min after finishing.
Below in conjunction with drawings and Examples the present invention is discussed in detail.
Fig. 1 is molten steel refining technology of the present invention and prior art calcium treating method production X60 pipe line steel processing period frequency distribution plan.
Fig. 2 is that molten steel refining technology of the present invention and prior art calcium treating method production X60 pipe line steel treating processes increase [N] amount comparison diagram.
Fig. 3 is molten steel refining technology of the present invention and prior art calcium treating method production X60 pipe line steel treating processes temperature drop comparison diagram.
Molten steel refining technology of the present invention comprises that vacuum circulation degassing is that RH handles, and before RH handles, in the treating processes and after handling, carries out bottom blowing Ar respectively and stir pre-treatment, desulfurization processing and calcium processing.At different steel grades and product requirement, can be in the one-time process process, finish RH processing, bottom blowing Ar stirring pre-treatment, desulfurization processing and calcium and handle four kinds of refining treatment, also can only carry out one or both processing in RH processing and bottom blowing Ar stirring pre-treatment, desulfurization processing, the calcium processing.Below be to adopt the inventive method to produce the technological process of X60 pipe line steel:
In the ladle handling during to RH ladle chassis, that connects ladle bottom blows the Ar pipe, leaves for RH at the RH chassis and handles in the station process, molten steel is carried out bottom blowing Ar stir pre-treatment.Bottom blowing Ar stirs the pretreated Ar pressure 1.0MPa that blows, and blows Ar intensity 300NL/min, pretreatment time 3min.With even molten steel composition and temperature, guarantee that RH sampling composition is even, temperature is representative, avoids owing to composition, non-uniform temperature cause the treatment time to prolong or the sampling of repetition thermometric.
In the RH treating processes, molten steel F[O]≤during 20ppm, feeding composite desulfate heart yearn carries out desulfurization in ladle.The core one-tenth of composite desulfate heart yearn is grouped into and comprises CaO64% (weight), CaF
220% (weight), Al
2O
314% (weight), its outer cladding has iron sheet.The feeding degree of depth of heart yearn in ladle is: be positioned at upcast lower end 800mm with, near the molten steel rises stream burst district of bag wall, feed quantity is: 5 kilograms of steel feeding core pulvis net weight per ton.Heart yearn is melted very soon, and flows to into upcast with steel, is flung by downtake to enter in the ladle again, promotes sweetening process.The diameter of composite desulfate heart yearn is 16mm, adopts double-current heart yearn to feed simultaneously, feeding speed 130m/min.With the feed quantity of guarantor unit in the time, effectively control the RH treatment time.
Inclusion morphology and sex change for a change after the RH processing finishes the thermometric sampling, feeds the CaSi heart yearn immediately and carries out the calcium processing when blowing Ar.Blow Ar pressure 1.0MPa, blow Ar intensity 300NL/min.The core calcium content of CaSi heart yearn is 30% (weight), and its outer cladding has iron sheet, feed quantity: 0.8 kilogram of steel feeding core pulvis net weight per ton, feeding speed 180m/min.The diameter of CaSi heart yearn is 13mm, adopts double-current heart yearn to feed simultaneously.Line feeding finishes to continue to blow Ar 4min.Calcium is handled after RH handles, and carries out under the non-vacuum condition, has reduced the volatilization of calcium.
The advantage that the present invention compared with prior art has is: because bottom blowing Ar stirs in advance The employing for the treatment of process, before having improved RH and processing, the hit at first time of temperature, composition sampling Rate can shorten RH process for producing cycle 3～5min. Calcium is processed after the RH processing finishes immediately Process station at RH and carry out, with prior art ladle handling to the station off-line that dusts is carried out the calcium place Reason is compared, and the calcium processing time shortens, and sees Fig. 1; The processing procedure nitrogen increased amount obviously descends, and sees figure 2; Temperature drop reduces, and sees Fig. 3. Process the worker with the disclosed calcium of Japanese patent laid-open 8-333619 Skill is compared, owing to carry out under non-vacuum condition, has reduced the volatilization of calcium, and the recovery rate of calcium can Improve 60%, see attached list, and inclusion morphology and mechanical performance have all been obtained further Improve. Subordinate list:
| Calcium treating method | Calcium recovery rate (%) |
| The open method of Unexamined Patent 8-333619 | 10,10 |
| The inventive method | 10.2,12.5,14.5,14.7,15.5,17.6,20.8,21.4 |
Claims (7)
1. molten steel refining technology comprises that vacuum circulation degassing is that RH handles, and is characterized in that it has following technological process:
1) leaves for RH at RH ladle chassis and handle in the station process, carry out bottom blowing Ar and stir pre-treatment;
2) in the RH treating processes, molten steel F[O]≤during 20ppm, feeding composite desulfate heart yearn carries out desulfurization and handles in ladle;
3) when the RH processing finishes RH groove destruction vacuum, feeding CaSi heart yearn carries out the calcium processing in ladle, or after the RH processing finishes the thermometric sampling, feeds the CaSi heart yearn immediately and carry out the calcium processing when blowing Ar.
2. molten steel refining technology according to claim 1 is characterized in that: the described Ar of blowing stirs pre-treatment, and it blows Ar pressure 0.6～1.0MPa, blows
ArIntensity 150～500NL/min, pretreatment time 2～4min.
3. molten steel refining technology according to claim 1 is characterized in that: described composite desulfate heart yearn, the proportioning raw materials of core pulvis is: the lime powder 55～75% (weight) of CaO 〉=90%, CaF
2〉=85%, SiO
2≤ 8% fluorite powder 15～35% (weight), Al
2O
3〉=80%, SiO
2≤ 10% bauxitic clay 10～20% (weight), granularity≤1mm, its outer cladding has iron sheet; The feeding degree of depth of heart yearn in ladle be positioned at upcast lower end 800mm with, near the molten steel rises stream burst district of bag wall, feed quantity is: 4～6 kilograms of steel feeding core pulvis net weight per ton.
4. molten steel refining technology according to claim 3 is characterized in that: described composite desulfate heart yearn, diameter is 16～20mm, adopts double-current heart yearn to feed simultaneously, feeding speed 100～150m/min.
5. molten steel refining technology according to claim 1 is characterized in that: described CaSi heart yearn, and core pulvis calcium content 28～32% (weight), its outer cladding has iron sheet, and feed quantity is: 0.6～1.0 kilogram of steel feeding core pulvis net weight per ton.
6. molten steel refining technology according to claim 5 is characterized in that: described CaSi heart yearn, diameter is 13～16mm, adopts double-current heart yearn to feed simultaneously or the feeding of single current heart yearn, feeding speed 160～220m/min.
7. according to claim 1,5 or 6 described molten steel refining technologies, it is characterized in that: feeding CaSi heart yearn carried out the calcium processing when described RH processing finished thermometric sampling after-blow Ar, it blows Ar pressure 0.6～1.0MPa, blow Ar intensity 150～300NL/min, line feeding continues to blow Ar2～6min after finishing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98125048 CN1062020C (en) | 1998-11-30 | 1998-11-30 | Molten steel refining technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98125048 CN1062020C (en) | 1998-11-30 | 1998-11-30 | Molten steel refining technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1220316A true CN1220316A (en) | 1999-06-23 |
| CN1062020C CN1062020C (en) | 2001-02-14 |
Family
ID=5228992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98125048 Expired - Lifetime CN1062020C (en) | 1998-11-30 | 1998-11-30 | Molten steel refining technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1062020C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101462155B (en) * | 2007-12-21 | 2010-12-01 | 首钢总公司 | Method for producing ultra-low carbon wire by small square billet continuous casting |
| 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 |
| CN102899448A (en) * | 2011-07-25 | 2013-01-30 | 攀钢集团攀枝花钢钒有限公司 | Treatment method for calcium in liquid steel |
| CN108330246A (en) * | 2017-01-20 | 2018-07-27 | 宝山钢铁股份有限公司 | Non-oriented electrical steel adds calcium method under a kind of non-vacuum |
-
1998
- 1998-11-30 CN CN 98125048 patent/CN1062020C/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101462155B (en) * | 2007-12-21 | 2010-12-01 | 首钢总公司 | Method for producing ultra-low carbon wire by small square billet continuous casting |
| 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 |
| CN102899448A (en) * | 2011-07-25 | 2013-01-30 | 攀钢集团攀枝花钢钒有限公司 | Treatment method for calcium in liquid steel |
| CN108330246A (en) * | 2017-01-20 | 2018-07-27 | 宝山钢铁股份有限公司 | Non-oriented electrical steel adds calcium method under a kind of non-vacuum |
| CN108330246B (en) * | 2017-01-20 | 2020-01-31 | 宝山钢铁股份有限公司 | method for adding calcium to non-oriented electrical steel in non-vacuum state |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1062020C (en) | 2001-02-14 |
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Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD Owner name: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD Free format text: FORMER NAME OR ADDRESS: BAOSHAN STEEL GROUP IRON AND STEEL CO LTD |
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Address after: 201900, Fujin Road, Shanghai, Baoshan District orchard Patentee after: BAOSHAN IRON & STEEL Co.,Ltd. Address before: 200122 No. 370 Pu circuit, Shanghai, Pudong New Area Patentee before: BAOSHAN IRON & STEEL CO.,LTD. Address after: 200122 No. 370 Pu circuit, Shanghai, Pudong New Area Patentee after: BAOSHAN IRON & STEEL CO.,LTD. Address before: 201900 No. 1, Middle Road, Baoshan District, Shanghai Patentee before: Baosteel Group Corporation |
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Granted publication date: 20010214 |