CN100519769C - Boron steel producing converter smelting process - Google Patents
Boron steel producing converter smelting process Download PDFInfo
- Publication number
- CN100519769C CN100519769C CNB2007100490053A CN200710049005A CN100519769C CN 100519769 C CN100519769 C CN 100519769C CN B2007100490053 A CNB2007100490053 A CN B2007100490053A CN 200710049005 A CN200710049005 A CN 200710049005A CN 100519769 C CN100519769 C CN 100519769C
- Authority
- CN
- China
- Prior art keywords
- steel
- boron
- add
- refining
- aluminium
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The present invention belongs to the field of iron and steel smelting technology, and is especially boron steel producing process in a converter. The production process includes the steps of smelting in a converter, deoxidizing and refining in a ladle, and boron alloying. The boron steel producing process has low oxygen content in molten steel after refining, high boron steel yield of 69.4-91.8 %, and excellent application foreground.
Description
Technical field
The invention belongs to field of iron and steel smelting, be specifically related to a kind of method of boron steel producing converter smelting.
Background technology
The adding of trace B in the steel; its objective is to improving the hardening capacity of steel; and for the production of boron steel; because the chemical property of boron is very active; in alloying process very easily with steel in element reaction such as oxygen, nitrogen, thereby cause the recovery rate of boron lower and recovery rate is unstable, therefore; for boron steel production, the metallargist is devoted to the research of boron alloy metallization processes for a long time always.
At present, the main production of boron steel comprises electric furnace and two kinds of technologies of converter, and is wherein more with eaf process research.Because there be one " reduction period " in the electrosmelting process, the oxygen level of slag and molten steel is low, is in good reducing atmosphere, and the recovery rate of boron is more easy to control relatively, but has the problem that recovery rate is low, fluctuation is big in actual production equally.As, " special steel " magazine (1992 the 13rd 5 phases of volume, P56～58) has been introduced Xining Steel Works's electric furnace and has been produced the 40MnB steel, adopts different methods to add ferro-boron and carries out alloying, and the boron rate of recovery fluctuates 10%～65%; Equally, " Liaoning metallurgy " magazine (1997 the 5th phases, P21～24) two kinds of boron alloy effects of comforting steel employing electric furnace production 40MnBH steel have been introduced, when adopting ladle to add FeB technology the boron recovery rate be 7.5%～87.5%, average 43.4%, the boron recovery rate is 23.5%～71.5%, average 50.9% when adopting ladle to feed FeB heart yearn technology; Problem at boron recovery rate in the boron steel production, the research of electrosmelting aspect the boron alloy metallization processes, obtained certain progress at present, as, " special steel " magazine (1997 the 18th 2 phases of volume, P30～32) ladle of having introduced Xining special steel company " 50t electric furnace-LF ladle furnace-die casting " technical process exploitation is fed B heart yearn technology, and the B average recovery rate is 85.0%.
But China Steel is produced most converter process that adopt at present, and the output of converter steelmaking reaches about 90% of ultimate production.Because the otherness of converter smelting and electrosmelting, some advanced technologies in the electric furnace production are difficult to be suitable in converter, therefore, certain research has been carried out at the process aspect of boron steel producing converter smelting in each this area in recent years, for example, application number is the explained hereafter boron steel that 03134895.5 Chinese patent discloses a kind of employing " desulfurizing iron is skimmed → top and bottom combined blown converter smelting → ladle deoxidation alloying → steel ladle bottom argon blowing refining; refining terminal point target oxygen activity 25 * 10-6～45 * 10-6 → feed Al; Si-Ca line; boron line → continuous casting ", boron content range 0.005%～0.012% in the steel, the recovery rate 40%～50% of boron; " steel research " magazine (2004 the 4th phases, P18～22) reported that Shoudu Iron and Steel Co adopts 80tLD converter → LF liquid steel refining, the control refining is arrived at a station oxygen activity less than (FeO+MnO)≤3.0% in 20 * 10-6, the slag → add Al, Ti, boron alloyization → billet continuous casting explained hereafter boron-containing steel, the average recovery rate 60% of B.Though, the technology of boron steel producing converter smelting is mature on the whole, but from the documents and materials of being reported, because the molten steel oxygen level is higher before the boron alloyization, be that deoxidation effect is relatively poor, the recovery rate of boron is generally on the low side, and low boron recovery rate often causes the boron content of Finished Steel to be lower than the steel grade requirement easily, brings very big difficulty to production.Simultaneously, low boron recovery rate is hanged down the oxide amount (B that means boron in the steel
2O
3) increase, and will reduce the hardening capacity of steel like this, thus the final performance of steel influenced.Therefore the method for the boron steel producing converter smelting that the molten steel oxygen level is low, the boron recovery rate is high after a kind of refining finishes is badly in need of developing in this area.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method of boron steel producing converter smelting.This method may further comprise the steps:
A, the water of in converter, just making steel;
B, in tapping process, in ladle, add reductor and carry out pre-deoxidation, and by the refining slag that steel per ton adds 7.0～11.0kg molten steel is carried out refining with tapping process, add aluminium then molten steel is carried out final deoxygenation, and sour molten aluminium in the molten steel is controlled at 0.02%～0.04%;
C, ladle is transported to the LF stove then and carried out refining once more, refining finishes to guarantee total amount≤2.0% of FeO and MnO in the slag, the α of molten steel
[O]≤ 10 * 10
-6
D, in ladle, add aluminium once more and carry out deep deoxidation, add aluminium after, add ferrotianium by the steel grade requirement, add ferro-boron at last on request, continuous casting, promptly.
Wherein, the physical and chemical index of reductor is among the step b of the method for above-mentioned boron steel producing converter smelting: contain CaC by weight
260%～70%, Si13%～20%, surplus are iron.Require its its carbon residue index 1%～3%, gas forming amount 180～210L/kg.
Wherein, the add-on of reductor is steel 2.0～3.0kg per ton among the aforesaid method step b.
Wherein, the predominant quantity percentage composition of slag charge should be controlled among the aforesaid method step b: Al
2O
340.0%～50.0%, SiO
213.0%～19.0%, surplus is CaO.Requiring its gas forming amount is 200～260L/kg.
Wherein, the add-on of slag charge is steel 7.0～11.0kg per ton among the aforesaid method step b.
Wherein, add aluminium in the aforesaid method steps d and carry out the mode of deep deoxidation for feeding aluminum steel.
Wherein, the add-on of aluminium is steel 0.20～0.25kg per ton in the aforesaid method steps d.
The concise and to the point technical process of production method of the present invention is: converter smelting → ladle pre-deoxidation and refining, ladle final deoxygenation → LF stove refining, deep deoxidation, alloying → continuous casting.
The inventive method can be implemented by following mode:
1) composite deoxidant that smelting molten steel in converter, converter tapping steel per ton in the process of ladle adds 2.0～3.0k carries out pre-deoxidation, the main physical and chemical index of the reductor CaC that is weight percentage
260%～70%, Si 13%～20%, surplus are iron, and the carbon residue index is 1%～3%, gas forming amount 180～210L/kg; Simultaneously, the refining slag that adds 7.0～11.0kg with tapping process steel per ton carries out refining to molten steel, and the main physical and chemical index that adds refining slag is: Al
2O
340.0%～50.0%, SiO
213.0%～19.0%, surplus is CaO, gas forming amount 200～260L/kg, and acid-soluble aluminum content in the molten steel is controlled at 0.02%～0.04%.
2) then ladle is transported to the LF stove and carried out refining again, refining finishes to guarantee total amount≤2.0% of FeO and MnO in the slag, and the oxygen activity of molten steel (is α
[O]) be worth less than 10 * 10
-6
3) carry out the alloying process of boron after refining is finished: in ladle, add aluminium at first once more and carry out deep deoxidation, add aluminium after, add ferrotianium by the steel grades requirement, add ferro-boron at last on request, continuous casting, promptly.
Enforcement the inventive method it should be noted that pre-deoxidation and final deoxygenation are all finished among the step a in ladle, but sequential difference, and pre-deoxidation is in that killing carries out while tapping from the process of converter tapping, and final deoxygenation then carries out after first refining is finished in tapping.CaC in the reductor
2Be the effective constituent of deoxidation, the carbon residue index of reductor is meant and adopts CaC among the present invention
2+ H
2O-Ca (OH)
2+ C
2H
2The amount of the remaining carbon in reaction back, this index is low more good more, illustrates that the effective constituent of reductor is high more.
In this area, the recovery rate of boron is: (boron content in tap * steel)/boron add-on * 100%; Known in this field, in the process of smelting boron steel, if the recovery rate of boron is low, then the oxide compound of boron and amount of nitrides can increase in the steel, and a large amount of existence of these materials will have a strong impact on the hardening capacity of steel; The recovery rate height also can reduce alloy addition, reduces cost, and economizes on resources, and is convenient to the stable control of processing parameter;
Beneficial effect of the present invention is, adopts the present invention to produce boron-containing steel and has low (the oxygen activity α [O]≤10 * 10 of molten steel oxygen level
-6, and prior art is commonly 20 * 10
-6More than), tangible advantage such as boron recovery rate height and recovery rate are stable.Adopt the inventive method that converter molten steel is carried out deoxidation and boron steel is produced in refining, can make the boron recovery rate is 69.4%～91.8%, and the recovery rate of existing converter process boron higher only about 60%, be better than prior art greatly.And the inventive method step is simple, and raw material is easy to get, and has made full use of existing technical process and equipment, does not need equipment is added or transforms, and has good application prospects.
Description of drawings:
Fig. 1 is the outline flowchart of the inventive method
Below, in conjunction with the accompanying drawings foregoing of the present invention is described in further detail again by embodiment.But this should be interpreted as it is limitation of the present invention.
Embodiment:
Embodiment one uses the inventive method smelting boron steel
Use the inventive method to smelt the boron steel of boron-containing quantity 0.0005%～0.0030%:
Add 135.2 tons of molten iron in the multiple converter in the end, top, just be smelt molten steel.
Converter tapping, tapping process add reductor 360kg (the about 2.7kg of steel per ton) and carry out pre-deoxidation, and the reductor main component is CaC
262.3%, Si17.5%; Tapping process adds refining slag 980kg (the about 7.4kg of steel per ton) simultaneously, and the main physical and chemical index of slag charge is: Al
2O
343.2%, SiO
217.5%, gas forming amount 240L/kg; Feed aluminum steel 300m (meter 60kg) with feeding wire machine and carry out final deoxygenation, analyzing the molten aluminium of molten steel acid is 0.022%.
After having fed aluminum steel, ladle is transported to the LF stove and is carried out refining, and refining finishes, and analyzing slag specimen is FeO 1.05%, and MnO 0.62%, on-line determination molten steel α
[O]Be 7 * 10
-6Refining finishes and adds aluminium 33kg (ton steel about 0.25kg) to ladle, adds adding ferrotianium 130kg (Ti 40%) behind the aluminium, adds ferro-boron 16kg (B 23.0%) at last, continuous casting, promptly.
Before adding boron, boron content is 0.0001% in the sampling analysis steel, and it is 0.0019% that Finished Steel is analyzed boron content, and the recovery rate of boron is 69.4%.
Embodiment two uses the inventive method smelting boron steel
Use the inventive method to smelt the boron steel of boron-containing quantity 0.0005%～0.0030%:
In the multiple converter in the end, top, add 140.5 tons of molten iron, just be smelt molten steel.
Converter tapping, tapping process add reductor 400kg (the about 2.8kg of steel per ton) and carry out pre-deoxidation, and the reductor main component is CaC
268.4%, Si 13.9%; Tapping process adds refining slag 1000kg (the about 7.1kg of steel per ton) simultaneously, and the main physical and chemical index of slag charge is: Al
2O
345.8%, SiO
216.2%, gas forming amount 260L/kg; Feed aluminum steel 300m (meter 60kg) with feeding wire machine and carry out final deoxygenation, analyzing the molten aluminium of molten steel acid is 0.029%.
After having fed aluminum steel, ladle is transported to the LF stove and is carried out refining, and refining finishes, and the analysis slag specimen is FeO0.79%, MnO0.23%, the α of on-line determination molten steel
[O]Be 5 * 10
-6Refining finishes and adds aluminium 30kg (the about 0.21kg of steel per ton) to ladle, adds to add ferrotianium 130kg (Ti 40%) behind the aluminium, adds ferro-boron 16kg (B2 3.0%) at last, continuous casting, promptly.
Add before the boron that boron content be＜0.0001% in the sampling analysis steel, Finished Steel analysis boron content is 0.0020%, and the recovery rate of boron is 75.7%.
Embodiment three uses the inventive method smelting boron steel
Use the inventive method to smelt the boron steel of boron-containing quantity 0.0005%～0.0030%:
In the multiple converter in the end, top, add 145.0 tons of molten iron, just be smelt molten steel.
Converter tapping, tapping process add reductor 420kg (the about 2.9kg of steel per ton) and carry out pre-deoxidation, and the reductor main component is CaC
265.3%, Si 14.6%; Tapping process adds refining slag 1200kg (the about 8.2kg of steel per ton), and the main physical and chemical index of slag charge is: Al
2O
345.4%, SiO
216.4%, gas forming amount 240L/kg; Feed Al line 400m (meter 80kg) with feeding wire machine and carry out final deoxygenation, getting the molten aluminium of steel sample analysis acid is 0.035%.
After having fed aluminum steel, ladle is transported to the LF stove and is carried out refining, and refining finishes, and the analysis slag specimen is FeO0.55%, MnO0.31%, the α of online detection molten steel
[O]Be 3 * 10
-6Refining finishes and adds aluminium 30kg (ton steel about 0.21kg) to ladle, adds adding ferrotianium 130kg (Ti 40%) behind the aluminium, adds ferro-boron 16kg (B 23.0%) at last, continuous casting, promptly.
Before adding boron, boron content is＜0.0001% in the sampling analysis steel, and it is 0.0023% that Finished Steel is analyzed boron content, and the recovery rate of boron is 91.3%.
Above-mentioned example shows, adopts the present invention to produce boron-containing steel, and the molten steel oxygen level is significantly less than prior art, waits tangible advantage.Can make the boron recovery rate is 69.4%～91.8%, and recovery rate is stable, also is better than existing converter process greatly.And the inventive method has made full use of existing technical process and equipment, do not need equipment is added or transforms, and step is simple, and raw material is easy to get, and has good application prospects.
Claims (3)
1, a kind of method of boron steel producing converter smelting is characterized in that adopting the explained hereafter boron-containing steel of converter smelting → ladle deoxidation, refining → boron alloyization, it is characterized in that may further comprise the steps:
A, the water of in converter, just making steel;
B, in tapping process, in ladle, add reductor and carry out pre-deoxidation, and by the refining slag that steel per ton adds 7.0～11.0kg molten steel is carried out refining with tapping process, add aluminium then molten steel is carried out final deoxygenation, and sour molten aluminium in the molten steel is controlled at 0.02%～0.04%; The physical and chemical index of described reductor is: contain CaC by weight
260%～70%, Si13%～20%, surplus are ferro element, and add-on is steel 2.0～3.0kg per ton; The predominant quantity percentage composition of described refining slag should be controlled at: Al
2O
340.0%～50.0%, SiO
213%～19.0%, surplus is CaO;
C, ladle is transported to the LF stove then and carried out refining once more, refining finishes to guarantee total amount≤2.0% of FeO and MnO in the slag, the α of molten steel
[O]≤ 10 * 10
-6
D, in ladle, add aluminium once more and carry out deep deoxidation, add aluminium after, add ferrotianium by the steel grade requirement, add ferro-boron at last on request, continuous casting, promptly.
2, the method for boron steel producing converter smelting according to claim 1 is characterized in that: the aluminium that adds described in the steps d carries out the mode of deep deoxidation for feeding aluminum steel.
3, the method for boron steel producing converter smelting according to claim 1 is characterized in that: the add-on of the aluminium described in the steps d is steel 0.20～0.25kg per ton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100490053A CN100519769C (en) | 2007-04-29 | 2007-04-29 | Boron steel producing converter smelting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100490053A CN100519769C (en) | 2007-04-29 | 2007-04-29 | Boron steel producing converter smelting process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101045948A CN101045948A (en) | 2007-10-03 |
| CN100519769C true CN100519769C (en) | 2009-07-29 |
Family
ID=38770870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100490053A Expired - Fee Related CN100519769C (en) | 2007-04-29 | 2007-04-29 | Boron steel producing converter smelting process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100519769C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074462A (en) * | 2013-02-01 | 2013-05-01 | 首钢水城钢铁（集团）有限责任公司 | Deoxidation method used in converter steelmaking process |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102719724B (en) * | 2011-03-29 | 2014-07-30 | 鞍钢股份有限公司 | Method for improving and stabilizing boron yield in smelting boron-containing steel |
| CN102719607B (en) * | 2011-03-29 | 2014-05-07 | 鞍钢股份有限公司 | Boron alloying method for ladle refining |
| CN102268513B (en) * | 2011-06-30 | 2012-12-12 | 攀钢集团有限公司 | Method for improving castability of molten steel of medium and low carbon steel |
| CN102312152B (en) * | 2011-09-30 | 2013-04-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel containing boron |
| CN102363828B (en) * | 2011-10-25 | 2014-01-15 | 浙江大隆合金钢有限公司 | Method for preventing longitudinal cracks of steel ingots by performing complex deoxidation by adding titanium and calcium into carbon structural steel and alloy structural steel |
| CN102424883B (en) * | 2011-12-05 | 2013-03-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Vacuum method for producing 25CrMnB steel |
| CN102409133B (en) * | 2011-12-05 | 2013-03-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing 23MnB steel by adopting vacuum process |
| CN102433414B (en) * | 2011-12-05 | 2013-05-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing 23MnB steel by adopting vacuum process |
| CN102424894B (en) * | 2011-12-05 | 2013-03-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing 23MnB steel in converter process |
| CN102409132B (en) * | 2011-12-05 | 2013-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing 25CrMnB steel through converter flow |
| CN102409134B (en) * | 2011-12-05 | 2013-03-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing 23MnB steel based on converter flow path |
| CN102994700B (en) * | 2012-11-28 | 2014-01-29 | 武钢集团昆明钢铁股份有限公司 | Smelting method for stably increasing content of boron in boron-containing steel |
| CN103422006B (en) * | 2013-07-15 | 2015-01-07 | 河北钢铁股份有限公司唐山分公司 | Boron-containing steel production method for reducing steel ladle lining refractory consumption |
| CN103436656B (en) * | 2013-08-26 | 2015-12-23 | 江苏大学 | A kind of borax replaces ferro-boron to carry out the boron micro-alloyed method of steel |
| CN103695600B (en) * | 2013-12-19 | 2015-05-13 | 马钢(集团)控股有限公司 | Low-cost production method of boracic low-alloy-structured steel sheet billet |
| CN104213023A (en) * | 2014-09-04 | 2014-12-17 | 武汉钢铁(集团)公司 | Welding stick steel with low carbon and high strength and production method thereof |
| CN104561449B (en) * | 2015-01-13 | 2016-05-18 | 山东钢铁股份有限公司 | A kind of ladle argon-blown is produced the smelting process containing boron high-toughness H shaped steel |
| CN105369010B (en) * | 2015-10-23 | 2017-11-28 | 首钢京唐钢铁联合有限责任公司 | A kind of method of Boron contents in control boron steel |
| CN109234607B (en) * | 2018-10-26 | 2020-11-10 | 山东钢铁集团日照有限公司 | Wide slab production method for increasing acid-soluble boron content |
| CN110373514A (en) * | 2019-08-30 | 2019-10-25 | 马鞍山钢铁股份有限公司 | A kind of stable method for improving boron recovery rate in steel |
| CN114182062B (en) * | 2021-12-08 | 2022-12-13 | 武汉钢铁有限公司 | Method for accurately controlling Als content of high-magnetic-induction oriented silicon steel plate blank |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000265208A (en) * | 1999-03-16 | 2000-09-26 | Nisshin Steel Co Ltd | Method for adding boron to molten steel in vacuum degassing treatment |
| CN1408886A (en) * | 2002-09-23 | 2003-04-09 | 郭建华 | Aluminum-calcium slag and its preparing method |
| CN1600885A (en) * | 2003-09-27 | 2005-03-30 | 首钢总公司 | Method for manufacturing continuous casting low carbon steel containing boron in small square billets |
| CN1600884A (en) * | 2004-09-01 | 2005-03-30 | 东北大学 | Method for smelting boron steel directly from pig iron containing boron |
-
2007
- 2007-04-29 CN CNB2007100490053A patent/CN100519769C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000265208A (en) * | 1999-03-16 | 2000-09-26 | Nisshin Steel Co Ltd | Method for adding boron to molten steel in vacuum degassing treatment |
| CN1408886A (en) * | 2002-09-23 | 2003-04-09 | 郭建华 | Aluminum-calcium slag and its preparing method |
| CN1600885A (en) * | 2003-09-27 | 2005-03-30 | 首钢总公司 | Method for manufacturing continuous casting low carbon steel containing boron in small square billets |
| CN1600884A (en) * | 2004-09-01 | 2005-03-30 | 东北大学 | Method for smelting boron steel directly from pig iron containing boron |
Non-Patent Citations (7)
| Title |
|---|
| 《中国冶金百科全书》. 137页，冶金工业出版社. 2003 炼钢学. 郑沛然 主编，160-161，冶金工业出版社. 2004 |
| 《中国冶金百科全书》. 137页，冶金工业出版社. 2003 * |
| 炼钢学. 郑沛然 主编，160-161，冶金工业出版社. 2004 * |
| 矩形坯连铸生产含硼钢试验. 于广石.钢铁研究，第2004卷第8期. 2004 |
| 矩形坯连铸生产含硼钢试验. 于广石.钢铁研究，第2004卷第8期. 2004 * |
| 采用BOF-LF-CC工艺试制20MnVB钢. 于广石.山东冶金，第26卷第3期. 2004 |
| 采用BOF-LF-CC工艺试制20MnVB钢. 于广石.山东冶金，第26卷第3期. 2004 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074462A (en) * | 2013-02-01 | 2013-05-01 | 首钢水城钢铁（集团）有限责任公司 | Deoxidation method used in converter steelmaking process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101045948A (en) | 2007-10-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100519769C (en) | Boron steel producing converter smelting process | |
| CN103468874B (en) | Method for manufacturing low-carbon TWIP steel through AOD (argon oxygen decarburization) furnace | |
| CN101503746A (en) | Method for producing boron steel by converter | |
| CN103627853A (en) | Method for manufacturing low-carbon and low-silicon steel | |
| CN100580117C (en) | Method for improving and stabilizing boron recovery rate for vacuum smelting steel containing boron | |
| CN102796947A (en) | High-grade non-oriented silicon steel with excellent magnetism and smelting method for high-grade non-oriented silicon steel | |
| CN110643785B (en) | Refining deoxidation method of low-carbon low-silicon welding wire steel | |
| CN102994871A (en) | Method for smelting medium/high-carbon hard-wired steel by vanadium-titanium containing molten iron | |
| CN114107601A (en) | Method for refining rare earth inclusions in steel by magnesium pretreatment | |
| CN101519747A (en) | Rare-earth aluminum-calcium-iron alloy | |
| CN103233094B (en) | Smelting process of high-strength alloy steel | |
| CN105039632B (en) | A kind of recovery rate method of B in raising 20MnTiB high-intensity fasteners steel smeltings | |
| CN103643117A (en) | Ultra-low aluminum steel and smelting method thereof | |
| CN108977612A (en) | The smelting process of high-strength weather-resistant bolt steel | |
| CN105886765A (en) | Method for producing ferrosilicon | |
| CN103695600B (en) | Low-cost production method of boracic low-alloy-structured steel sheet billet | |
| CN105369010B (en) | A kind of method of Boron contents in control boron steel | |
| CN101451209B (en) | Method for adding ferroboron during steel smelting process | |
| CN101054613A (en) | Fluxing agent for prerefining molten steel during tapping process | |
| CN101565792B (en) | Method for smelting boron steel | |
| CN109097665A (en) | The smelting process of high-strength weather-resistant bolt steel | |
| CN105274281A (en) | Method used for controlling boron content in steel accurately | |
| CN110714161B (en) | High-sulfur free-cutting steel for automobile and production process thereof | |
| CN102102138A (en) | Method for solving problem of copper segregation in steel | |
| CN104988282A (en) | Deoxidation method for converter smelted 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 | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 617000 No. 90 Taoyuan Road, Sichuan, Panzhihua Co-patentee after: Pangang Group Steel Vanadium & Titanium Co., Ltd. Patentee after: Panzhihua Iron & Steel Research Institute of PanGang Group Address before: 617000 No. 90 Taoyuan Road, Sichuan, Panzhihua Co-patentee before: Panzhihua New Steel & Vanadium Co., Ltd. Patentee before: Panzhihua Iron & Steel Research Institute of PanGang Group |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090729 Termination date: 20160429 |