CN101250659A - Method for improving and stabilising boron recovery rate for vacuum smelting steel containing boron - Google Patents
Method for improving and stabilising boron recovery rate for vacuum smelting steel containing boron Download PDFInfo
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- CN101250659A CN101250659A CNA2008100154979A CN200810015497A CN101250659A CN 101250659 A CN101250659 A CN 101250659A CN A2008100154979 A CNA2008100154979 A CN A2008100154979A CN 200810015497 A CN200810015497 A CN 200810015497A CN 101250659 A CN101250659 A CN 101250659A
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Abstract
The invention belongs to the iron and steel smelting field, which particularly relates to a method for smelting boron steel in vacuum and improving and stabilizing boron recovery ratio. The invention is characterized in that the method comprises the following steps: alloying boron before molten water vacuum disposal, getting molten water sample to analyze after processing molten water in vacuum, wherein boron recovery ratio is stabilized over 90%, achieving the purpose of producing a same boron containing steel grade, wherein the content deviation of smelting component boron among furnaces is less than 2ppm(namely 0.0002%). And the problems of unstable boron recovery ratio after molten water is processed in vacuum to alloy boron and secondary pollution to molten water which is caused in the process of alloying boron.
Description
Technical field
The invention belongs to field of iron and steel smelting, relate to the method that a kind of vacuum metling boron-containing steel improves and stablize the boron rate of recovery.
Background technology
The adding of trace B in the steel, its main purpose are in order to improve the hardening capacity of steel.Production for boron-containing steel, because boron content control in steel own is lower, chemical property is comparatively active in addition, thereby causes the rate of recovery instability of boron, fluctuation big, cause that to produce between same each heat of boracic steel grade the boron content deviation bigger, it is big finally to show as performance difference.In order to stablize the rate of recovery of boron, boron alloyization is generally closed in smelting and is adopted the mode that the aluminium suitcase is wrapped up in ferro-boron insertion molten steel or hello ferro-boron cored-wire to add when finishing.
The situation of the boron-containing steel boron rate of recovery is smelted in relevant document introduction:
| Sequence number | Name of document | Publish or deliver the time | Issue | The page number | The boron rate of recovery |
| 1 | Special steel | 1992 | 5 | 56～58 | 10～65％ |
| 2 | Liaoning metallurgy | 1997 | 5 | 21～24 | 23.5～71.5％ |
| 3 | Special steel | 1997 | 2 | 30～32 | Average 85% |
| 4 | Steel research | 2004 | 4 | 18～22 | Average 60% |
| 5 | Patent: converter smelting boron-containing steel | 2007 | Application number: 200710049005.3 | 69.4～91.8％ |
At present, in order to improve the quality of steel, reduce obnoxious flavour in the steel, increasing molten steel is all handled through vacuum outgas.Produce boron-containing steel and carry out boron alloyization again after vacuum-treat, boron also is difficult to reach in molten steel evenly in the short period of time, and alloying process also can cause secondary pollution to molten steel, influences the vacuum-treat effect.In addition, in order to stablize the performance of boron-containing steel, except that other elements, control has also proposed requirements at the higher level to boron content close limit, and the raising and the stable boron rate of recovery are significant to stablizing the boron-containing steel quality.
Against vacuum is smelted boron-containing steel, consults document, carry out boron alloyization after being vacuum, and boron rate of recovery instability and boron alloy process can cause secondary pollution to molten steel.
Summary of the invention
Carry out boron alloyization after the objective of the invention is to solve the molten steel vacuum-treat, boron rate of recovery instability and boron alloy process can cause the secondary pollution problem to molten steel, provide a kind of vacuum metling boron-containing steel to improve and stablize the method for the boron rate of recovery.
The invention provides the method that a kind of vacuum metling boron-containing steel improves and stablize the boron rate of recovery, it is characterized in that, carry out boron alloyization before the molten steel vacuum-treat.
A kind of vacuum metling boron-containing steel improves and stablizes the method for the boron rate of recovery, may further comprise the steps successively:
1), molten steel adopts the reductor deoxidation of deoxidizing capacity greater than boron, molten steel is finally controlled slag composition (%FeO)+(%MnO)＜1.50%, (%SiO behind LF stove or other reduction furnace deoxygenation refinings
2)＜15.00%, weight ratio;
2), add ferro-boron or feeding ferro-boron cored-wire;
3), molten steel vacuum-treat;
4), after the molten steel vacuum-treat, get the molten steel sample and analyze boron content.
Deoxidation of molten steel technology and molten steel vacuum processing technique all can adopt technique known.
Preferably, described deoxidizing capacity is selected from aluminium, calcium or titanium greater than the reductor of boron.
The beneficial effect of this aspect is: after the molten steel vacuum-treat, get the analysis of molten steel sample, the boron rate of recovery is stabilized in more than 90%; Can realize producing same boracic steel grade, smelting component boron content deviation is less than 2ppm (promptly 0.0002%) between stove and the stove.Carry out boron alloyization after having solved the molten steel vacuum-treat, boron rate of recovery instability and boron alloy process can cause the secondary pollution problem to molten steel.
Following enforcement is used to set forth the present invention, but protection scope of the present invention is not limited in following examples.
Embodiment 1:
The 35MnB steel of vacuum metling boron-containing quantity 0.0005%～0.0030% uses the inventive method to carry out boron alloyization and control boron content.
Molten steel is analyzed molten steel aluminium content 0.048%, titanium content 0.034% behind LF stove deoxygenation refining; Analyze slag specimen (FeO) content 0.18%, (MnO) content 0.80%, (SiO
2) content 5.84%; 53.5 tons of molten steel amounts.
Ladle adopts the mode that the aluminium suitcase is wrapped up in ferro-boron insertion molten steel to add ferro-boron to furnaceman VD position, vacuumizes the processing molten steel then, 21 minutes vacuum-treat total times.Add 6.0 kilograms of ferro-boron amounts, ferro-boron boron-containing quantity 21.44%.Boron content is 0.0002% in the preceding analysis of the adding ferro-boron molten steel, and boron content is 0.0024% in the vacuum-treat post analysis molten steel, and the rate of recovery of boron is 91.50%.
Embodiment 2:
The 35MnB steel of vacuum metling boron-containing quantity 0.0005%～0.0030% uses the inventive method to carry out boron alloyization and control boron content.
Molten steel is analyzed molten steel aluminium content 0.037%, titanium content 0.033% behind LF stove deoxygenation refining; Analyze slag specimen (FeO) content 0.15%, (MnO) content 0.78%, (SiO
2) content 6.37%; 54.0 tons of molten steel amounts.
Ladle adopts the mode that directly ferro-boron is added molten steel to add ferro-boron to furnaceman VD position, vacuumizes the processing molten steel then, 20 minutes vacuum-treat total times.Add 5.5 kilograms of ferro-boron amounts, ferro-boron boron-containing quantity 21.44%.Boron content is 0.0002% in the preceding analysis of the adding ferro-boron molten steel, and boron content is 0.0022% in the vacuum-treat post analysis molten steel, and the rate of recovery of boron is 91.59%.
Embodiment 3:
The 27MnTiB steel of vacuum metling boron-containing quantity 0.0005%～0.0030% uses the inventive method to carry out boron alloyization and control boron content.
Molten steel is analyzed molten steel aluminium content 0.035%, titanium content 0.054% behind LF stove deoxygenation refining; Analyze slag specimen (FeO) content 0.27%, (MnO) content 0.75%, (SiO
2) content 7.08%; 54.5 tons of molten steel amounts.
Ladle adopts the mode that the aluminium suitcase is wrapped up in ferro-boron insertion molten steel to add ferro-boron to furnaceman VD position, vacuumizes the processing molten steel then, 24 minutes vacuum-treat total times.Add 4.5 kilograms of ferro-boron amounts, ferro-boron boron-containing quantity 21.44%.Boron content is 0.0002% in the preceding analysis of the adding ferro-boron molten steel, and boron content is 0.0018% in the vacuum-treat post analysis molten steel, and the rate of recovery of boron is 90.38%.
Embodiment 4:
The 27MnTiB steel of vacuum metling boron-containing quantity 0.0005%～0.0030% uses the inventive method to carry out boron alloyization and control boron content.
Molten steel is analyzed molten steel aluminium content 0.032%, titanium content 0.053% behind LF stove deoxygenation refining; Analyze slag specimen (FeO) content 0.24%, (MnO) content 0.73%, (SiO
2) content 6.96%; 54.0 tons of molten steel amounts.
Ladle adopts the mode of ferro-boron cored-wire feeding molten steel to add ferro-boron to furnaceman VD position, vacuumizes the processing molten steel then, 25 minutes vacuum-treat total times.Add 4.4 kilograms of ferro-boron amounts, ferro-boron boron-containing quantity 21.44%.Boron content is 0.0002% in the preceding analysis of the adding ferro-boron molten steel, and boron content is 0.0018% in the vacuum-treat post analysis molten steel, and the rate of recovery of boron is 91.59%.
Claims (3)
1. a vacuum metling boron-containing steel improves and stablizes the method for the boron rate of recovery, it is characterized in that, carry out boron alloyization before the molten steel vacuum-treat.
2. vacuum metling boron-containing steel as claimed in claim 1 improves and stablizes the method for the boron rate of recovery, may further comprise the steps successively:
1), molten steel adopts the reductor deoxidation of deoxidizing capacity greater than boron, molten steel is finally controlled slag composition (%FeO)+(%MnO)＜1.50%, (%SiO behind LF stove or other reduction furnace deoxygenation refinings
2)＜15.00%, weight ratio;
2), add ferro-boron or feeding ferro-boron cored-wire;
3), molten steel vacuum-treat;
4), after the molten steel vacuum-treat, get the molten steel sample and analyze boron content.
3. vacuum metling boron-containing steel as claimed in claim 1 improves and stablizes the method for the boron rate of recovery, it is characterized in that described deoxidizing capacity is selected from aluminium, calcium or titanium greater than the reductor of boron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810015497A CN100580117C (en) | 2008-04-08 | 2008-04-08 | Method for improving and stabilizing boron recovery rate for vacuum smelting steel containing boron |
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|---|---|---|---|
| CN200810015497A CN100580117C (en) | 2008-04-08 | 2008-04-08 | Method for improving and stabilizing boron recovery rate for vacuum smelting steel containing boron |
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| CN101250659A true CN101250659A (en) | 2008-08-27 |
| CN100580117C CN100580117C (en) | 2010-01-13 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812643B (en) * | 2009-11-30 | 2012-05-30 | 济南钢铁股份有限公司 | Boracic pinion steel and preparation method thereof |
| CN102477473A (en) * | 2010-11-20 | 2012-05-30 | 山西太钢不锈钢股份有限公司 | Method for controlling boron content of boron-containing steel smelted by vacuum induction furnace |
| CN102719607A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Boron alloying method for ladle refining |
| CN101818230B (en) * | 2009-02-27 | 2012-12-19 | 鞍钢股份有限公司 | Using method of manganese boron deoxidizer |
| CN102994700A (en) * | 2012-11-28 | 2013-03-27 | 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 |
| CN103422006A (en) * | 2013-07-15 | 2013-12-04 | 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 |
| CN104451030A (en) * | 2014-12-03 | 2015-03-25 | 河北钢铁股份有限公司 | Method for accurately controlling boron content during smelting of boron-containing steel in vacuum induction furnace |
| CN106756440A (en) * | 2017-03-15 | 2017-05-31 | 常熟理工学院 | A kind of smelting process of precise control boron-containing alloy steel Boron contents |
| CN111020103A (en) * | 2019-11-22 | 2020-04-17 | 舞阳钢铁有限责任公司 | Ferroboron adding method and ferroboron adding device for improving acid-soluble boron proportion |
| CN112795840A (en) * | 2020-12-24 | 2021-05-14 | 舞阳钢铁有限责任公司 | 690 MPa-grade steel plate and production method thereof |
-
2008
- 2008-04-08 CN CN200810015497A patent/CN100580117C/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818230B (en) * | 2009-02-27 | 2012-12-19 | 鞍钢股份有限公司 | Using method of manganese boron deoxidizer |
| CN101812643B (en) * | 2009-11-30 | 2012-05-30 | 济南钢铁股份有限公司 | Boracic pinion steel and preparation method thereof |
| CN102477473A (en) * | 2010-11-20 | 2012-05-30 | 山西太钢不锈钢股份有限公司 | Method for controlling boron content of boron-containing steel smelted by vacuum induction furnace |
| CN102477473B (en) * | 2010-11-20 | 2013-06-12 | 山西太钢不锈钢股份有限公司 | Method for controlling boron content of boron-containing steel smelted by vacuum induction furnace |
| CN102719607B (en) * | 2011-03-29 | 2014-05-07 | 鞍钢股份有限公司 | Boron alloying method for ladle refining |
| CN102719607A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Boron alloying method for ladle refining |
| CN102994700A (en) * | 2012-11-28 | 2013-03-27 | 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 |
| CN103422006A (en) * | 2013-07-15 | 2013-12-04 | 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 |
| 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 |
| CN104451030A (en) * | 2014-12-03 | 2015-03-25 | 河北钢铁股份有限公司 | Method for accurately controlling boron content during smelting of boron-containing steel in vacuum induction furnace |
| CN104451030B (en) * | 2014-12-03 | 2016-03-30 | 河北钢铁股份有限公司 | The accuracy control method of Boron contents during vacuum induction furnace smelting boron-containing steel |
| CN106756440A (en) * | 2017-03-15 | 2017-05-31 | 常熟理工学院 | A kind of smelting process of precise control boron-containing alloy steel Boron contents |
| CN111020103A (en) * | 2019-11-22 | 2020-04-17 | 舞阳钢铁有限责任公司 | Ferroboron adding method and ferroboron adding device for improving acid-soluble boron proportion |
| CN112795840A (en) * | 2020-12-24 | 2021-05-14 | 舞阳钢铁有限责任公司 | 690 MPa-grade steel plate and production method thereof |
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|---|---|
| CN100580117C (en) | 2010-01-13 |
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Effective date of registration: 20120305 Address after: 250101 Ji'nan Industrial Road, Shandong, No. 21 Patentee after: Jinan Iron and Steel Co., Ltd. Address before: 271104, Xinxing Road, Gangcheng District, Shandong, Laiwu, 21 Patentee before: Laiwu Iron Co., Ltd. |
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Address after: 250101 Ji'nan Industrial Road, Shandong, No. 21 Patentee after: Shandong Iron & Steel Group Co., Ltd. Address before: 250101 Ji'nan Industrial Road, Shandong, No. 21 Patentee before: Jinan Iron and Steel Co., Ltd. |
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