CN102676727B - Process for controlling smelting silicon content of low-silicon steel - Google Patents
Process for controlling smelting silicon content of low-silicon steel Download PDFInfo
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Abstract
The invention belongs to a steel-making process in the metallurgy field and relates to a process for preventing silicon increase in the smelting process of low-silicon steel and stably controlling silicon content at an end point of molten steel. By means of accurate ingredient and temperature control at a blowing end point of converter, steel-tapping deoxidization alloying and remaining oxygen operation, temperature rise of oxidizing slag at an earlier stage of a refining furnace and optimization of a slagging process in deoxidization desulfuration procedures, molten steel increase (Si) in the whole smelting process is smaller than 0.02%, the ingredient control at a smelting end point is stable and accurate, surfaces of casting blank and inside quality are excellent, the substandard rate of the casting blanks is reduced, and the economic profit is improved.
Description
Technical field
The invention belongs to the process for making of field of metallurgy, relate to a kind of smelting low-silicon steel silicone content and control technique, relate to specifically low silicon variety steel and prevent that smelting process from increasing silicon and the stable technique of controlling molten steel terminal silicone content.
Background technology
Due to the coating performance important of element silicon in steel to steel plate, it is generally acknowledged when in steel, [Si] surpasses 0.04%, the oxide film that high temperature coating raw sheet surface forms is difficult to fully be reduced, and the coating rear surface generates very thick canescence coating, and its adhesion property is poor.silicone content in converter current blow end point molten steel is vestige ([Si] ﹤ 0.001%) basically, in converter slag, (Si02) content is between 10%～20%, the tapping pushing off the slag is bad, and slag material, iron alloy is unavoidably brought a certain amount of silicon into, cause the enrichment of ladle top slag silicone content, at follow-up deoxidation of molten steel, when the slag making desulfurization goes to be mingled with refining, (Si02) in ladle top slag is easy to be reduced into [Si] by strong reductants such as aluminium and enters molten steel, cause that molten steel increases silicon, this just makes while producing low-silicon steel, the deoxidation of molten steel, desulfurization, slag making Control and Inclusion Removal and increase silicon phenomenon contradiction, prevent that whole smelting process from increasing silicon and becoming the bottleneck of smelting low-silicon variety steel.In order to break through this restricted bottleneck, develop and a kind ofly prevent that smelting process from increasing silicon and the stable control technique of continuous casting terminal silicone content, to be badly in need of a problem that solves, particularly for continuous many heats cast silicone contents less than 0.03% low-silicon steel, there will be because silicone content is controlled unstable disconnected the watering with strand that causes and the series of problems such as changed the original sentence to.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, provides a kind of smelting low-silicon steel silicone content to control technique, prevent that smelting process from increasing silicon less than 0.02%, stable molten steel terminal [Si] ﹤ 0.03% that controls, molten steel terminal Composition Control is accurate, and casting billet surface and internal soundness are good.
The technical scheme that the present invention solves above technical problem is:
The smelting low-silicon steel silicone content is controlled technique, comprising:
Converter smelting process:
1. dark desulfurization operations: enter the stove molten iron through the desulfurization pre-treatment and skim totally, requiring [S]≤0.002%;
2. terminal operation: improve a time catch carbon hit rate, avoid a little blowing, prevent Molten Steel over-oxidation, control oxygen in steel by the control to converter terminal carbon, improve as much as possible converter tapping carbon under the condition that meets the LF carbon increasing amount, terminal [C] content is controlled at 0.06%～0.10%, and [O] content is controlled at≤and 0.050%, tapping temperature, greater than 1640～1680 ℃, avoids refining furnace to return silicon in the heat temperature raising process frequently;
3. pushing off the slag operation: strictly control the lower quantity of slag in tapping process, control the lower quantity of slag≤2kg/t, prevent that the silicon in the high white residue of converter from entering molten steel;
4. stay oxygen operation: tapping process adopts the weak deoxidation of manganese aluminium, controls in the refining furnace molten steel [O] at 80～150ppm, avoids the strong deoxidation of converter tapping and causes back silicon;
The refining furnace smelting technology:
(I) steel converter [S], meet the requirements of sulfur steel, refining process:
When converter tapping [S] meets the requirement of steel grade sulphur, refining furnace only needs composition, temperature are finely tuned and the floating of inclusion is removed, LF stokehold phase 6～10min stays the oxygen heating, the disposable target temperature that is warmed up to, reduce the lower electrode heating times, feed a deoxidation of aluminum steel and increase aluminium and put in place, prevent frequent heat up and deoxidation causes and increases silicon;
(Ii) steel converter [S], greater than steel sulfur requirements, the refining process:
the LF stove is processed and is stayed oxygen heat temperature raising 6～10min early stage, during heating, argon bottom-blowing is controlled 200～400Nl/min, after being raised to 1580～1595 ℃ of suitable temperature, the disposable target temperature that is warmed up to, with aluminium wire and aluminium powder, slag is carried out diffusive deoxidation, aluminium wire add-on ton steel is less than 1Kg, simultaneously according to the slag condition, add lime, fluorite carries out the slag making desulfurization, each lime adding amount ton steel is less than 4 Kg, the slag color becomes grey and greyish-green gets final product, the sweetening process flow 350～500Nl/min that calms the anger, the disposable aluminum steel of feeding is mended sour molten aluminium in molten steel, feed aluminum steel and control argon flow amount 30～60Nl/min, carry out the fine setting of composition and temperature after line feeding, temperature adjustment will be to shorten heat-up time and to reduce heating times as principle as far as possible, promote the floating of inclusion to remove for better, control soft stirring greater than 12min, the soft argon flow amount 10～60Nl/min that stirs.
Like this, by converter tapping high temperature, stay the oxygen operation, deoxidation optimization after stove, refining furnace stays oxygen to heat up in earlier stage, the optimization of refining process deoxidation, desulfurization slag making and argon bottom-blowing technique; By to converter terminal accurately composition carbon oxygen control, oxygen, the optimization of refining furnace intensification, deoxidation, desulfurization slag making and argon bottom-blowing technique are stayed in pushing off the slag tapping steel, tapping; Smelting process is optimized temperature, deoxidation slag making, argon gas bottom blowing; Prevent that smelting process from increasing silicon less than 0.02%, stable molten steel terminal [Si] ﹤ 0.03% that controls, molten steel terminal Composition Control is accurate, and casting billet surface and internal soundness are good, have realized the control of smelting low-silicon steel process molten steel [Si] stable content.
The technical scheme that the present invention further limits is:
Aforesaid smelting low-silicon steel silicone content is controlled technique, in the institute's oxygen that stays operation, alloy and slag charge addition sequence: lime → high carbon ferromanganese → aluminium block, carbon dust adds with alloy, suitably increases the amount of lime that converter tapping process adds, and amount of lime increases to the 5kg/t steel, form in advance high alkalinity top slag, dilute ladle top slag, further reduce the activity of SiO2 in ladle top slag, finally reduce the SiO2 reduction and become the driving source of element silicon.
The invention has the beneficial effects as follows: the present invention has successfully solved low silicon variety steel smelting process and has increased the control difficult point of silicon, and while particularly guaranteeing the continuous pouring heat, the stable control of smelting process increases silicon less than 0.02%, the stable 0.03% following level that is controlled at of terminal silicone content.The stable low-silicon steel terminal composition hit rate that improved of the present invention, reduce strand and change the original sentence to rate, thereby reduced the production cost of low-silicon steel, increases substantially economic benefit.
Description of drawings
Fig. 1 is process flow sheet of the present invention.
Embodiment
Embodiment 1
The smelting low-silicon steel silicone content of the present embodiment is controlled technical process as shown in Figure 1, comprising:
Converter smelting process:
1. dark desulfurization operations: enter the stove molten iron through the desulfurization pre-treatment and skim totally, requiring [S] 0.002%; Control impurity in steel scrap, reduce the converter tapping sulphur content, alleviate the LF operation and make the desulfurization burden of strong reducing slag, prevent strongly reducing atmosphere, the factors such as long-time refining, the silicon in the reduction ladle top slag, cause molten steel to return silicon;
2. terminal operation: improve a time catch carbon hit rate, avoid a little blowing, prevent Molten Steel over-oxidation, control oxygen in steel by the control to converter terminal carbon, improve as much as possible converter tapping carbon under the condition that meets the LF carbon increasing amount, terminal [C] content is controlled at 0.06%, and [O] content is controlled at 0.050%, tapping temperature, greater than 1640 ℃, avoids refining furnace to return silicon in the heat temperature raising process frequently;
3. pushing off the slag operation: strictly control the lower quantity of slag in tapping process, control lower quantity of slag 2kg/t, prevent that the silicon in the high white residue of converter from entering molten steel;
4. stay oxygen operation: tapping process adopts the weak deoxidation of manganese aluminium, controls in the refining furnace molten steel [O] at 80ppm, avoids the strong deoxidation of converter tapping and causes back silicon; Alloy and slag charge addition sequence: lime → high carbon ferromanganese → aluminium block, carbon dust adds with alloy, suitably increase the amount of lime that converter tapping process adds, amount of lime increases to the 5kg/t steel, form in advance high alkalinity top slag, dilute ladle top slag, further reduce the activity of SiO2 in ladle top slag, finally reduce the SiO2 reduction and become the driving source of element silicon.
The refining furnace smelting technology:
(I) steel converter [S], meet the requirements of sulfur steel, refining process:
When converter tapping [S] meets the requirement of steel grade sulphur, refining furnace only needs composition, temperature are finely tuned and the floating of inclusion is removed, LF stokehold phase 6min stays the oxygen heating, the disposable target temperature that is warmed up to, reduce the lower electrode heating times, feed a deoxidation of aluminum steel and increase aluminium and put in place, prevent frequent heat up and deoxidation causes and increases silicon; Technique: LF stay oxygen heat up → determine oxygen, thermometric take a sample → feed aluminum steel take off molten steel oxygen, mend aluminium → fine setting composition → little argon gas stir 3 minutes → determine oxygen, the thermometric aluminum steel benefit aluminium → soft stirring 15min → continuous casting of taking a sample → feed.
Refinery practice when (2) converter tapping [S] requires greater than steel grade sulphur:
the LF stove is processed and is stayed oxygen heat temperature raising 6min early stage, during heating, argon bottom-blowing is controlled 200Nl/min, after being raised to 1580 ℃ of suitable temperature, the disposable target temperature that is warmed up to, with aluminium wire and aluminium powder, slag is carried out diffusive deoxidation, aluminium wire add-on ton steel 0.8Kg, simultaneously according to the slag condition, add lime, fluorite carries out the slag making desulfurization, each lime adding amount ton steel is less than 3.6Kg, the slag color becomes grey and greyish-green gets final product, sweetening process flow 350 Nl/min that calm the anger, the disposable aluminum steel of feeding is mended sour molten aluminium in molten steel, feed aluminum steel and control argon flow amount 30Nl/min, carry out the fine setting of composition and temperature after line feeding, temperature adjustment will be to shorten heat-up time and to reduce heating times as principle as far as possible, promote the floating of inclusion to remove for better, control the soft 13min that stirs, the soft argon flow amount 10Nl/min that stirs.
Embodiment 2
The smelting low-silicon steel silicone content of the present embodiment is controlled technical process as shown in Figure 1, comprising:
Converter smelting process:
1. dark desulfurization operations: enter the stove molten iron through the desulfurization pre-treatment and skim totally, requiring [S] 0.0015%; Control impurity in steel scrap, reduce the converter tapping sulphur content, alleviate the LF operation and make the desulfurization burden of strong reducing slag, prevent strongly reducing atmosphere, the factors such as long-time refining, the silicon in the reduction ladle top slag, cause molten steel to return silicon;
2. terminal operation: improve a time catch carbon hit rate, avoid a little blowing, prevent Molten Steel over-oxidation, control oxygen in steel by the control to converter terminal carbon, improve as much as possible converter tapping carbon under the condition that meets the LF carbon increasing amount, terminal [C] content is controlled at 0.08%, and [O] content is controlled at 0.040%, tapping temperature, greater than 1660 ℃, avoids refining furnace to return silicon in the heat temperature raising process frequently;
3. pushing off the slag operation: strictly control the lower quantity of slag in tapping process, control lower quantity of slag 1.5kg/t, prevent that the silicon in the high white residue of converter from entering molten steel;
4. stay oxygen operation: tapping process adopts the weak deoxidation of manganese aluminium, controls in the refining furnace molten steel [O] at 100ppm, avoids the strong deoxidation of converter tapping and causes back silicon; Alloy and slag charge addition sequence: lime → high carbon ferromanganese → aluminium block, carbon dust adds with alloy, suitably increase the amount of lime that converter tapping process adds, amount of lime increases to the 5kg/t steel, form in advance high alkalinity top slag, dilute ladle top slag, further reduce the activity of SiO2 in ladle top slag, finally reduce the SiO2 reduction and become the driving source of element silicon.
The refining furnace smelting technology:
(I) steel converter [S], meet the requirements of sulfur steel, refining process:
When converter tapping [S] meets the requirement of steel grade sulphur, refining furnace only needs composition, temperature are finely tuned and the floating of inclusion is removed, LF stokehold phase 8min stays the oxygen heating, the disposable target temperature that is warmed up to, reduce the lower electrode heating times, feed a deoxidation of aluminum steel and increase aluminium and put in place, prevent frequent heat up and deoxidation causes and increases silicon; Technique: LF stay oxygen heat up → determine oxygen, thermometric take a sample → feed aluminum steel take off molten steel oxygen, mend aluminium → fine setting composition → little argon gas stir 4 minutes → determine oxygen, the thermometric aluminum steel benefit aluminium → soft stirring 15min → continuous casting of taking a sample → feed.
Refinery practice when (2) converter tapping [S] requires greater than steel grade sulphur:
the LF stove is processed and is stayed oxygen heat temperature raising 8min early stage, during heating, argon bottom-blowing is controlled 300 Nl/min, after being raised to 1588 ℃ of suitable temperature, the disposable target temperature that is warmed up to, with aluminium wire and aluminium powder, slag is carried out diffusive deoxidation, aluminium wire add-on ton steel 0.6Kg, simultaneously according to the slag condition, add lime, fluorite carries out the slag making desulfurization, each lime adding amount ton steel 3 Kg, the slag color becomes grey and greyish-green gets final product, sweetening process flow 400 Nl/min that calm the anger, the disposable aluminum steel of feeding is mended sour molten aluminium in molten steel, feed aluminum steel and control argon flow amount 45Nl/min, carry out the fine setting of composition and temperature after line feeding, temperature adjustment will be to shorten heat-up time and to reduce heating times as principle as far as possible, promote the floating of inclusion to remove for better, control the soft 16min that stirs, the soft argon flow amount 40Nl/min that stirs.
Embodiment 3
The smelting low-silicon steel silicone content of the present embodiment is controlled technical process as shown in Figure 1, comprising:
Converter smelting process:
1. dark desulfurization operations: enter the stove molten iron through the desulfurization pre-treatment and skim totally, requiring [S] 0.001%; Control impurity in steel scrap, reduce the converter tapping sulphur content, alleviate the LF operation and make the desulfurization burden of strong reducing slag, prevent strongly reducing atmosphere, the factors such as long-time refining, the silicon in the reduction ladle top slag, cause molten steel to return silicon;
2. terminal operation: improve a time catch carbon hit rate, avoid a little blowing, prevent Molten Steel over-oxidation, control oxygen in steel by the control to converter terminal carbon, improve as much as possible converter tapping carbon under the condition that meets the LF carbon increasing amount, terminal [C] content is controlled at 0.10%, and [O] content is controlled at 0.030%, tapping temperature, greater than 1680 ℃, avoids refining furnace to return silicon in the heat temperature raising process frequently;
3. pushing off the slag operation: strictly control the lower quantity of slag in tapping process, control lower quantity of slag 1.5kg/t, prevent that the silicon in the high white residue of converter from entering molten steel;
4. stay oxygen operation: tapping process adopts the weak deoxidation of manganese aluminium, controls in the refining furnace molten steel [O] at 150ppm, avoids the strong deoxidation of converter tapping and causes back silicon; Alloy and slag charge addition sequence: lime → high carbon ferromanganese → aluminium block, carbon dust adds with alloy, suitably increase the amount of lime that converter tapping process adds, amount of lime increases to the 5kg/t steel, form in advance high alkalinity top slag, dilute ladle top slag, further reduce the activity of SiO2 in ladle top slag, finally reduce the SiO2 reduction and become the driving source of element silicon.
The refining furnace smelting technology:
(I) steel converter [S], meet the requirements of sulfur steel, refining process:
When converter tapping [S] meets the requirement of steel grade sulphur, refining furnace only needs composition, temperature are finely tuned and the floating of inclusion is removed, LF stokehold phase 10min stays the oxygen heating, the disposable target temperature that is warmed up to, reduce the lower electrode heating times, feed a deoxidation of aluminum steel and increase aluminium and put in place, prevent frequent heat up and deoxidation causes and increases silicon; Technique: LF stay oxygen heat up → determine oxygen, thermometric take a sample → feed aluminum steel take off molten steel oxygen, mend aluminium → fine setting composition → little argon gas stir 5 minutes → determine oxygen, the thermometric aluminum steel benefit aluminium → soft stirring 20min → continuous casting of taking a sample → feed.
Refinery practice when (2) converter tapping [S] requires greater than steel grade sulphur:
the LF stove is processed and is stayed oxygen heat temperature raising 10min early stage, during heating, argon bottom-blowing is controlled 400 Nl/min, after being raised to 1595 ℃ of suitable temperature, the disposable target temperature that is warmed up to, with aluminium wire and aluminium powder, slag is carried out diffusive deoxidation, aluminium wire add-on ton steel 0.4Kg, simultaneously according to the slag condition, add lime, fluorite carries out the slag making desulfurization, each lime adding amount ton steel 2Kg, the slag color becomes grey and greyish-green gets final product, sweetening process flow 500 Nl/min that calm the anger, the disposable aluminum steel of feeding is mended sour molten aluminium in molten steel, feed aluminum steel and control argon flow amount 60Nl/min, carry out the fine setting of composition and temperature after line feeding, temperature adjustment will be to shorten heat-up time and to reduce heating times as principle as far as possible, promote the floating of inclusion to remove for better, control the soft 20min that stirs, soft argon flow amount 60 Nl/min that stir.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (2)
1. the smelting low-silicon steel silicone content is controlled technique, it is characterized in that:
Converter smelting process:
1. dark desulfurization operations: enter the stove molten iron through the desulfurization pre-treatment and skim totally, requiring [S]≤0.002%;
2. terminal operation: improve a time catch carbon hit rate, avoid a little blowing, prevent Molten Steel over-oxidation, control oxygen in steel by the control to converter terminal carbon, improve as much as possible converter tapping carbon under the condition that meets the LF carbon increasing amount, terminal [C] content is controlled at 0.06%～0.10%, and [O] content is controlled at≤and 0.050%, tapping temperature, greater than 1640～1680 ℃, avoids refining furnace to return silicon in the heat temperature raising process frequently;
3. pushing off the slag operation: strictly control the lower quantity of slag in tapping process, control the lower quantity of slag≤2kg/t, prevent that the silicon in the high white residue of converter from entering molten steel;
4. stay oxygen operation: tapping process adopts the weak deoxidation of manganese aluminium, controls in the refining furnace molten steel [O] at 80～150ppm, avoids the strong deoxidation of converter tapping and causes back silicon;
The refining furnace smelting technology:
(I) steel converter [S], meet the requirements of sulfur steel, refining process:
When converter tapping [S] meets the requirement of steel grade sulphur, refining furnace only needs composition, temperature are finely tuned and the floating of inclusion is removed, LF stokehold phase 6～10min stays the oxygen heating, the disposable target temperature that is warmed up to, reduce the lower electrode heating times, feed a deoxidation of aluminum steel and increase aluminium and put in place, prevent frequent heat up and deoxidation causes and increases silicon;
(Ii) steel converter [S], greater than steel sulfur requirements, the refining process:
the LF stove is processed and is stayed oxygen heat temperature raising 6～10min early stage, during heating, argon bottom-blowing is controlled 200～400 NL/min, after being raised to 1585～1595 ℃ of suitable temperature, the disposable target temperature that is warmed up to, with aluminium wire and aluminium powder, slag is carried out diffusive deoxidation, aluminium wire add-on ton steel is less than 1kg, simultaneously according to the slag condition, add lime, fluorite carries out the slag making desulfurization, each lime adding amount ton steel is less than 4 kg, the slag color becomes grey and greyish-green gets final product, sweetening process argon flow amount 350～500NL/min, the disposable aluminum steel of feeding is mended sour molten aluminium in molten steel, feed aluminum steel and control argon flow amount 30～60NL/min, carry out the fine setting of composition and temperature after line feeding, temperature adjustment will be to shorten heat-up time and to reduce heating times as principle as far as possible, promote the floating of inclusion to remove for better, control soft stirring greater than 12min, the soft argon flow amount 10～60NL/min that stirs.
2. smelting low-silicon steel silicone content as claimed in claim 1 is controlled technique, it is characterized in that: in the institute's oxygen that stays operation, alloy and slag charge addition sequence: lime → high carbon ferromanganese → aluminium block, carbon dust adds with alloy, increase the amount of lime that converter tapping process adds, amount of lime increases to the 5kg/t steel, forms in advance high alkalinity top slag, the dilution ladle top slag, further reduce SiO in ladle top slag
2Activity, finally reduce SiO
2Reduction becomes the driving source of element silicon.
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| CN102952923B (en) * | 2012-11-27 | 2014-11-05 | 南京钢铁股份有限公司 | Process for smelting aluminum containing steel through calcium carbide deoxidation |
| CN103233096B (en) * | 2013-04-25 | 2015-01-07 | 武汉钢铁(集团)公司 | Low-carbon deep-desulfurization refining method of LF (ladle refining) furnace |
| CN103468865B (en) * | 2013-09-24 | 2015-04-01 | 武汉钢铁(集团)公司 | Method for controlling silicon content in low-silicon aluminum steel refining process |
| CN105420446A (en) * | 2014-09-22 | 2016-03-23 | 南京钢铁股份有限公司 | Light treatment smelting method for ladle furnace (LF) |
| CN104531953B (en) * | 2015-01-14 | 2016-06-15 | 山东钢铁股份有限公司 | A kind of refine argon jetting method being applied to SPHC steel grade |
| CN107955856A (en) * | 2017-10-24 | 2018-04-24 | 河钢股份有限公司承德分公司 | A kind of method of low-silicon steel refining desulfuration |
| CN107916319B (en) * | 2017-11-16 | 2020-05-05 | 武汉钢铁有限公司 | Refining method of LF furnace in container steel production of CSP production line |
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| CN111254340A (en) * | 2020-01-21 | 2020-06-09 | 鞍钢股份有限公司 | Smelting method of ultra-low silicon high titanium aluminum-containing welding wire steel |
| CN111647718A (en) * | 2020-06-17 | 2020-09-11 | 攀钢集团西昌钢钒有限公司 | Control method for silicon content of high-strength high-aluminum high-vanadium molten steel |
| CN111893400B (en) * | 2020-08-18 | 2021-11-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel for welded pipe with yield strength of 300MPa |
| CN112322837B (en) * | 2020-11-05 | 2022-02-01 | 马鞍山钢铁股份有限公司 | Smelting process for efficient slagging and desulfurization of LF (ladle furnace) aluminum killed steel |
| CN112593039A (en) * | 2020-12-31 | 2021-04-02 | 唐山燕山钢铁有限公司 | Method for reducing smelting cost of non-oriented silicon steel W800 |
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