CN105648138B - A kind of method for reducing converter semi-steel making nitrogen content - Google Patents
A kind of method for reducing converter semi-steel making nitrogen content Download PDFInfo
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- CN105648138B CN105648138B CN201610105729.4A CN201610105729A CN105648138B CN 105648138 B CN105648138 B CN 105648138B CN 201610105729 A CN201610105729 A CN 201610105729A CN 105648138 B CN105648138 B CN 105648138B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
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Abstract
The invention belongs to metallurgical technology field, and in particular to a kind of method for reducing converter semi-steel making nitrogen content.The inventive method includes：A, converter smelting control hot metal ratio, makes hot metal ratio ＞ 0.9；B, blowing the later stage, using low rifle position operate：On the basis of Converter Oxigen Blowing amount, when blowing oxygen quantity reaches the 70~80% of total oxygen demand, oxygen lance position is reduced, until tapping；Dolomite is added when c, tapping to 2/3, while adds lime, one layer of top slag, thickness of slag layer ＜ 60mm are formed in molten steel face；D, tapping adds top slag modifier after terminating；E, tapping hole is safeguarded, ensures that tapping steel stream does not dissipate.A kind of method for reducing converter semi-steel making nitrogen content of the present invention, tapping nitrogen content is controlled by converter smelting, so that tapping Control of Nitrogen Content can meet the needs of the steel grade higher to requirement of nitrogen, the inventive method has a good application prospect and promotional value within 15ppm.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of method for reducing converter semi-steel making nitrogen content.
Background technology
For most of steel grades, nitrogen is harmful element, and nitrogen in steel content has a great influence to the mechanical performance of steel, especially
It is that the adverse effect of nitrogen is particularly evident when producing for the low-carbon under the conditions of deep-draw, ultra-low-carbon steel.The increase of nitrogen in steel content, meeting
Improve the yield limit, strength degree and hardness of steel, plasticity declines, and impact flexibility reduces, and causes age-hardening.Nitrogen can also
The ductile-brittle transition temperature of steel is increased substantially, but also there is a possibility that steel produces Low-Temperature Temper Brittleness, some nitride can also be led
Cause the hot-short of steel.Therefore, smelting with high value added products such as high deep drawing quality, high intensity, it is necessary to the nitrogen content in steel is reduced,
The extent of injury of the nitrogen in molten steel is reduced, so as to ensure the deep drawability of steel, reduction is ageing, eliminates yield point elongation and shows
As making steel surface bright and clean, lumber recovery is high.
Semi-steel making is because its more general molten iron of carbon mass percent is low (3.4%~4.0%), silicon, manganese heating in half steel
Slagging constituent content is vestige, therefore semisteel smelting has in converting process that acid slagging material is few, slag system constituent element is single and hot
The features such as insufficient is measured, this make it that semi-steel making is more difficult than molten iron-steelmaking, while can according to the solubility formula of nitrogen in steel content
Know：
The theoretical dissolution degree of nitrogen content in molten steel can be increased in steel less containing V, Ti and Si, Mn contents.Therefore, molten steel during semisteel smelting
The middle more general molten iron of Control of Nitrogen Content is more difficult.
Converter smelting is to remove one of maximally effective means of Nitrogen in Hot Metal, the RH in the case where nitrogen content of molten steel is higher
Application of vacuum can also slough part nitrogen content, in practice it has proved that when nitrogen content is less than 35ppm in molten steel, RH application of vacuum denitrogenation is imitated
Fruit is very poor, can cause molten steel nitrogen pick-up because vacuum plant sealing effectiveness is bad toward contact.Using traditional smelting process converter terminal
Nitrogen content of molten steel can be controlled within 30ppm, and is fluctuated greatly, and then needs converter tapping nitrogen to contain the higher steel grade of requirement of nitrogen
Within 15ppm, using can be with stability contorting within 15ppm after this method for amount control.
The content of the invention
The technical problems to be solved by the invention are to provide one kind and control tapping nitrogen content by converter smelting, make final
Method of the nitrogen content stability contorting in below 15ppm in molten steel.
A kind of method for reducing converter semi-steel making nitrogen content of the present invention, wherein this method include：
A, converter smelting control hot metal ratio, wherein hot metal ratio ＞ 0.9；
B, blowing the later stage, using low rifle position operate：On the basis of Converter Oxigen Blowing amount, reach the 70 of total oxygen demand in blowing oxygen quantity
When~80%, oxygen lance position is reduced, until tapping；
Dolomite is added when c, tapping to 2/3, while adds lime, one layer of top slag, thickness of slag layer ＜ are formed in molten steel face
60mm；
D, tapping adds top slag modifier after terminating；
E, tapping hole is safeguarded, ensures that tapping steel stream rounding does not dissipate.
Further, as preferred technical scheme, a kind of side for reducing converter semi-steel making nitrogen content described above
Method, wherein a are preferably a step 0.9 ＜ hot metal ratios ＜ 1.
A kind of method for reducing converter semi-steel making nitrogen content described above, oxygen lance position is reduced wherein in b step the bottom of to
More than portion 1~1.4m.
A kind of method for reducing converter semi-steel making nitrogen content described above, wherein during semisteel smelting, in order to avoid
N2Enter Deng other gases in oxygen, influence final half steel performance, the oxygen purity ＞ 99.7% of oxygen blast.
A kind of method for reducing converter semi-steel making nitrogen content described above, while dolomite is added wherein in step c,
According to 4~6kg/t steel, refining granule lime, granularity≤50mm of the granule lime are added.
Further, as preferred technical scheme, a kind of side for reducing converter semi-steel making nitrogen content described above
Method, wherein 5mm ＜ granularities≤50mm granule lime account for more than the 95wt% of whole granule limes；Granularity≤5mm granule is white
Ash is not more than the 5wt% of whole granule limes.
It is described above it is a kind of reduce converter semi-steel making nitrogen content method, wherein in Step d top slag modifier mainly into
It is divided into MgO >=56.83%, C >=10%, moisture≤2.53%.
Further, a kind of method for reducing converter semi-steel making nitrogen content described above, pushes up slag modification wherein in Step d
The addition of agent is 1~4kg/t steel.
Further, as preferred technical scheme, a kind of side for reducing converter semi-steel making nitrogen content described above
The addition of top slag modifier is 2~3kg/t steel in method, wherein Step d.
A kind of method for reducing converter semi-steel making nitrogen content described above, nitrogen content ＜ in molten steel wherein after converter blow off
15ppm。
A kind of method for reducing converter semi-steel making nitrogen content of the present invention, tapping nitrogen content is controlled by converter smelting,
So that tapping Control of Nitrogen Content within 15ppm, can meet the needs of the steel grade higher to requirement of nitrogen, and use tradition
Smelting process converter terminal nitrogen content of molten steel can be controlled within 30ppm, and is fluctuated big.The inventive method has good application
Prospect and promotional value, can be enterprise's creation income more than 5,000,000/year.
Embodiment
A kind of method for reducing converter semi-steel making nitrogen content of the present invention, wherein this method include：
A, converter smelting control hot metal ratio, reduces and adds steel scrap process nitrogen increased amount, make hot metal ratio ＞ 0.9；
B, blowing the later stage, using low rifle position operate：On the basis of Converter Oxigen Blowing amount, reach total oxygen demand in top blast blowing oxygen quantity
70~80% when, reduce oxygen lance position reduce nitrogen pick-up, avoid re-blowing, until tapping；
Dolomite is added when c, tapping to 2/3, while adds lime, one layer of top slag is formed in molten steel face, is effectively completely cut off
Air, and ensure that molten steel has certain oxygen content, prevent from inhaling nitrogen, thickness of slag layer ＜ 60mm；
D, tapping adds top slag modifier after terminating, and is for residue adjustment, prevents from inhaling nitrogen；
E, tapping hole is safeguarded, has kept tapping hole state, ensures that tapping steel stream rounding does not dissipate, reduces molten steel and connect with air
Contacting surface.
Further, a kind of method for reducing converter semi-steel making nitrogen content described above, wherein hot metal ratio no maximum, but
It is to consider that a is preferably a step 0.9 ＜ hot metal ratios ＜ 1 to consume steel scrap and economic benefit,.
A kind of method for reducing converter semi-steel making nitrogen content described above, oxygen lance position is reduced wherein in b step the bottom of to
More than portion 1~1.4m.
A kind of method for reducing converter semi-steel making nitrogen content described above, wherein during semisteel smelting, in order to avoid
N2Enter Deng other gases in oxygen, influence final half steel performance, the oxygen purity ＞ 99.7% of oxygen blast.
A kind of method for reducing converter semi-steel making nitrogen content described above, while dolomite is added wherein in step c,
According to 4~6kg/t steel, refining granule lime, granularity≤50mm of the granule lime are added.
Further, as preferred technical scheme, a kind of side for reducing converter semi-steel making nitrogen content described above
Method, wherein 5mm ＜ granularities≤50mm granule lime account for more than the 95wt% of whole granule limes；Granularity≤5mm granule is white
Ash is not more than the 5wt% of whole granule limes.
It is described above it is a kind of reduce converter semi-steel making nitrogen content method, wherein in Step d top slag modifier mainly into
It is divided into MgO >=56.83%, C >=10%, moisture≤2.53%.
Further, a kind of method for reducing converter semi-steel making nitrogen content described above, pushes up slag modification wherein in Step d
The addition of agent is 1~4kg/t steel.
Further, as preferred technical scheme, a kind of side for reducing converter semi-steel making nitrogen content described above
The addition of top slag modifier is 2~3kg/t steel in method, wherein Step d.
A kind of method for reducing converter semi-steel making nitrogen content described above, nitrogen content ＜ in molten steel wherein after converter blow off
15ppm。
The embodiment of the present invention is further described with reference to embodiment, therefore not limited the present invention
System is among described scope of embodiments.
Embodiment 1
The 200t converters of certain factory use semi-steel making, converter smelting control hot metal ratio, hot metal ratio 0.9, are bessemerizing the later stage
Iron ore, oxygen purity are added, mass fraction is more than 99.7%；In the blowing later stage, operated using low rifle position：With Converter Oxigen Blowing amount
On the basis of, when blowing oxygen quantity reaches the 75% of total oxygen demand, oxygen lance position is reduced to 1~1.4m, avoids tapping of re-blowing；Tap to 2/
Dolomite is put into when 3, while adds 1000kg refining granule lime, one layer of top slag is formed in molten steel face, thickness of slag layer is small
In 60mm, air is effectively completely cut off, and ensure that molten steel has certain oxygen content, prevented from inhaling nitrogen, tapping adds after terminating
400kg top slag modifiers；Converter taphole will frequently be safeguarded, kept tapping hole state, ensure that tapping steel stream rounding does not dissipate；
After using these measures, converter blow off nitrogen is can be controlled within 15ppm.
Embodiment 2
The 200t converters of certain factory use semi-steel making, converter smelting control hot metal ratio, hot metal ratio 0.91, are bessemerizing the later stage
Iron ore, oxygen purity are added, mass fraction is more than 99.8%；In the blowing later stage, operated using low rifle position：With Converter Oxigen Blowing amount
On the basis of, when blowing oxygen quantity reaches the 75% of total oxygen demand, oxygen lance position is reduced to 1~1.35m, avoids tapping of re-blowing；Tapping is extremely
Dolomite is put into when 2/3, while adds 1010kg refining granule lime, one layer of top slag, thickness of slag layer are formed in molten steel face
Less than 60mm, air is effectively completely cut off, and ensure that molten steel has certain oxygen content, prevented from inhaling nitrogen, tapping adds after terminating
Enter 410kg top slag modifiers；Converter taphole will frequently be safeguarded, kept tapping hole state, ensure that tapping steel stream rounding is not sent out
Dissipate；After using these measures, converter blow off nitrogen is can be controlled within 15ppm.
Embodiment 3
Converter smelting controls hot metal ratio, hot metal ratio 0.95, is bessemerizing later stage addition iron ore, oxygen purity, quality
Fraction is more than 99.9%；In the blowing later stage, operated using low rifle position：On the basis of Converter Oxigen Blowing amount, reach total oxygen in blowing oxygen quantity
Amount 75% when, reduce oxygen lance position to 1~1.36m, avoid tapping of re-blowing；Dolomite is put into when tapping is to 2/3, is added simultaneously
1020kg refining granule lime, forms one layer of top slag in molten steel face, and thickness of slag layer is less than 60mm, has effectively completely cut off sky
Gas, and ensure that molten steel has certain oxygen content, prevent from inhaling nitrogen, tapping adds 420kg top slag modifiers after terminating；To converter
Tapping hole will be safeguarded frequently, keep tapping hole state, ensure that tapping steel stream rounding does not dissipate；After using these measures, converter
Blow off nitrogen is can be controlled within 15ppm.
In summary, using converter tapping nitrogen content can be reduced after the method.
Claims (10)
- A kind of 1. method for reducing converter semi-steel making nitrogen content, it is characterised in that：This method includes：A, converter smelting control hot metal ratio, wherein hot metal ratio ＞ 0.9；B, blowing the later stage, using low rifle position operate：On the basis of Converter Oxigen Blowing amount, blowing oxygen quantity reach total oxygen demand 70~ When 80%, more than oxygen lance position to bottom 1~1.4m is reduced, until tapping；Dolomite is added when c, tapping to 2/3, while adds lime, one layer of top slag, thickness of slag layer ＜ 60mm are formed in molten steel face；D, tapping adds top slag modifier after terminating；E, tapping hole is safeguarded, ensures that tapping steel stream rounding does not dissipate.
- A kind of 2. method for reducing converter semi-steel making nitrogen content according to claim 1, it is characterised in that：A steps 0.9 ＜ Hot metal ratio ＜ 1.
- A kind of 3. method for reducing converter semi-steel making nitrogen content according to claim 1, it is characterised in that：Blown in b step The oxygen purity ＞ 99.7% of oxygen.
- A kind of 4. method for reducing converter semi-steel making nitrogen content according to claim 1, it is characterised in that：Add in step c While entering dolomite, according to 4~6kg/t steel, refining granule lime, granularity≤50mm of the granule lime are added.
- A kind of 5. method for reducing converter semi-steel making nitrogen content according to claim 4, it is characterised in that：In granule lime 5mm ＜ granularities≤50mm more than the 95wt% for accounting for whole granule limes；Granularity≤5mm granule lime is not more than whole granules The 5wt% of lime.
- A kind of 6. method for reducing converter semi-steel making nitrogen content according to claim 1, it is characterised in that：Pushed up in Step d Slag modifier main component is MgO >=56.83%, C >=10%, moisture≤2.53%.
- 7. according to a kind of method for reducing converter semi-steel making nitrogen content of claim 1 or 6, it is characterised in that：In Step d The addition of top slag modifier is 1~4kg/t steel.
- A kind of 8. method for reducing converter semi-steel making nitrogen content according to claim 7, it is characterised in that：Pushed up in Step d The addition of slag modifier is 2~3kg/t steel.
- 9. according to a kind of any one of claim 1~6 method for reducing converter semi-steel making nitrogen content, it is characterised in that： Nitrogen content ＜ 15ppm in molten steel after converter blow off.
- A kind of 10. method for reducing converter semi-steel making nitrogen content according to claim 8, it is characterised in that：Converter blow off Nitrogen content ＜ 15ppm in molten steel afterwards.
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| CN201610105729.4A CN105648138B (en) | 2016-02-25 | 2016-02-25 | A kind of method for reducing converter semi-steel making nitrogen content |
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| CN106244765A (en) * | 2016-09-05 | 2016-12-21 | 攀钢集团攀枝花钢铁研究院有限公司 | The denitrogenation method of converter semi-steel making |
| CN106521076A (en) * | 2016-11-14 | 2017-03-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling nitrogen increment in process of converter steel tapping |
| CN109504818B (en) * | 2018-12-20 | 2021-07-09 | 首钢京唐钢铁联合有限责任公司 | Method for controlling smoke emission of semisteel in full-three-removal process |
| CN110106304A (en) * | 2019-04-23 | 2019-08-09 | 邯郸钢铁集团有限责任公司 | The converter smelting method of ultralow nitrogen IF steel |
| CN111334635B (en) * | 2020-03-16 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | Method for modifying top slag of deep-drawing steel |
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| CN101469356A (en) * | 2007-12-29 | 2009-07-01 | 安阳钢铁集团有限责任公司 | Steel melting method for reducing nitrogen content in steel by converter tapping feeble deoxidization |
| CN102277467A (en) * | 2010-06-09 | 2011-12-14 | 鞍钢股份有限公司 | Method for denitrifying molten steel in tapping process of converter |
| CN102230051B (en) * | 2011-06-16 | 2012-12-12 | 攀钢集团有限公司 | Method for controlling nitrogen content in steel by semi-steel smelting |
| CN102719600A (en) * | 2012-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Production method of ultra low carbon steel |
| CN102851433B (en) * | 2012-08-29 | 2014-06-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling content of nitrogen in semi-steel smelted tire cord steel or hard wire steel |
| CN102978330B (en) * | 2012-11-27 | 2014-07-09 | 南京钢铁股份有限公司 | Method for controlling tapping nitrogen content of converter |
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Effective date of registration: 20171207 Address after: 617000 Taoyuan street, Panzhihua, Sichuan, No. 90 Applicant after: Sichuan Pan Yan Technology Co., Ltd. Address before: 617000 Taoyuan street, Panzhihua, Sichuan, No. 90 Applicant before: Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. |
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