CN101045948A - Method for producing boron steel by smelting in converter - Google Patents
Method for producing boron steel by smelting in converter Download PDFInfo
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- CN101045948A CN101045948A CN 200710049005 CN200710049005A CN101045948A CN 101045948 A CN101045948 A CN 101045948A CN 200710049005 CN200710049005 CN 200710049005 CN 200710049005 A CN200710049005 A CN 200710049005A CN 101045948 A CN101045948 A CN 101045948A
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- aluminium
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- 229910000712 Boron steel Inorganic materials 0.000 title claims abstract description 31
- 238000003723 Smelting Methods 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 95
- 239000010959 steel Substances 0.000 claims abstract description 95
- 238000000034 method Methods 0.000 claims abstract description 62
- 229910052796 boron Inorganic materials 0.000 claims abstract description 59
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000007670 refining Methods 0.000 claims abstract description 39
- 229910052782 aluminium Inorganic materials 0.000 claims description 32
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 31
- 239000004411 aluminium Substances 0.000 claims description 23
- 239000002893 slag Substances 0.000 claims description 22
- 238000010079 rubber tapping Methods 0.000 claims description 18
- 238000009749 continuous casting Methods 0.000 claims description 9
- 238000006392 deoxygenation reaction Methods 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 11
- 239000001301 oxygen Substances 0.000 abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 abstract description 11
- 238000005275 alloying Methods 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 229910052742 iron Inorganic materials 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 241001062472 Stokellia anisodon Species 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910000521 B alloy Inorganic materials 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910008455 Si—Ca Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Abstract
The invention belongs to the field of steel smelting, and particularly relates to a method for producing boron steel by smelting in a converter. The method adopts the process of converter smelting → ladle deoxidation, refining → boron alloying to produce boron steel. The boron steel produced by the method has low oxygen content of the molten steel after refining, and the obtained boron-containing steel has high yield of 69.4-91.8 percent and has good application prospect.
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%, Si 13%～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%, Si 17.5%; 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 (B 23.0%) 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 (7)
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%;
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 physical and chemical index of the described reductor of step b is: contain CaC by weight
260%～70%, Si 13%～20%, surplus are ferro element.
3, the method for boron steel producing converter smelting according to claim 1 is characterized in that: the add-on of the described reductor of step b is steel 2.0～3.0kg per ton.
4, the method for boron steel producing converter smelting according to claim 1 is characterized in that: the predominant quantity percentage composition of the slag charge described in the step b should be controlled at: Al
2O
340.0%～50.0%, SiO
213.0%～19.0%, surplus is CaO.
5, the method for boron steel producing converter smelting according to claim 1 is characterized in that: the add-on of the refining slag described in the step b is steel 7.0～11.0kg per ton.
6, the method for boron steel producing converter smelting according to claim 1 is characterized in that: the aluminium that adds described in the step b carries out the mode of deep deoxidation for feeding aluminum steel.
7, 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 step c is steel 0.20～0.25kg per ton.
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|---|---|---|---|
| CNB2007100490053A CN100519769C (en) | 2007-04-29 | 2007-04-29 | Method for producing boron steel by smelting in converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100490053A CN100519769C (en) | 2007-04-29 | 2007-04-29 | Method for producing boron steel by smelting in converter |
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| Publication Number | Publication Date |
|---|---|
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| CN100519769C CN100519769C (en) | 2009-07-29 |
Family
ID=38770870
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| CN1224722C (en) * | 2002-09-23 | 2005-10-26 | 郭建华 | Aluminum-calcium slag and its preparing method |
| CN1309856C (en) * | 2003-09-27 | 2007-04-11 | 首钢总公司 | Method for manufacturing continuous casting low carbon steel containing boron in small square billets |
| CN1296504C (en) * | 2004-09-01 | 2007-01-24 | 东北大学 | Method for smelting boron steel directly from pig iron containing boron |
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2007
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