CN1597998A - Process for producing steel containing alumium low carbon low ilicon by small square blank continuous caster - Google Patents

Process for producing steel containing alumium low carbon low ilicon by small square blank continuous caster Download PDF

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Publication number
CN1597998A
CN1597998A CN 03157160 CN03157160A CN1597998A CN 1597998 A CN1597998 A CN 1597998A CN 03157160 CN03157160 CN 03157160 CN 03157160 A CN03157160 A CN 03157160A CN 1597998 A CN1597998 A CN 1597998A
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slag
steel
refining
control
station
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CN100343397C (en
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许晓东
李永东
李本海
曾利
王丽萍
于广石
刘光明
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Shougang Group Co Ltd
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Shougang Corp
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Abstract

The invention relates to a method of making small billet casting with low carbon, low silicon aluminium-containing steel. Its features lie in: the converter adopts the double-slag operation, controls the carbon 0.08% to 0.18% in the end and the temperature of 1640deg.C to 1680deg.C and output the steel while fencing off the slag. Final deoxidization by the Al-Mn-Fe and adding the steel of the 3.0kg/t to 5.0kg/t and 200ky to 400kg of slag into every converter. Controlling the destination degree of the oxygen less than 10ppm, according to 0.02% to 0.035% of the middle package, 0.03% to 0.05% of leaving the station after being refined, 0.002% to 0.01% of leaving the place after being refined and 0.025% to 0.038% of reaching the destination after being refined, adjusting the Ca-Si line according to 0.1 of the Ca/Si after feeding the Al. The invention can stabilize the Als between 0.02% and 0.05%.

Description

The continuous small-billet casting low carbon low silicon contains the production method of aluminum steel
Affiliated field
The present invention relates to a kind of production method of continuous small-billet casting ML12-20Al steel, be specially adapted to the production of continuous small-billet casting low carbon low silicon aluminium killed steel.
Background technology
Domestic production ML12-20Al steel traditional technology is: converter or electrosmelting → cast static ingot or bloom casting machine cast steel billet → breaking down cogging → wire rod or merchant bar mill stocking.The ML12-20Al steel that adopts this method to produce, operation is many, and labour intensity is big, and lumber recovery is low, the production cost height.Along with the technical progress of metallurgical industry, traditional die casting production technique is progressively replaced by continuous casting process, and progressively reduces production costs, and therefore research adopts continuous casting process to produce the ML12-20Al low carbon low silicon aluminium killed steel becomes important topic.
Tradition adopts the steel grade of continuous small-billet casting explained hereafter to require Al≤0.006% in the steel.ML12-20Al composition C ≯ 0.25%, Si ≯ 0.10%, Al 〉=0.020% belongs to low carbon low silicon aluminium killed steel.The difficult point of continuous small-billet casting production is strict control molten steel oxidation, guarantees the Al that deoxidation produces 2O 3Be mingled with abundant come-up, under molten steel purity condition with higher, adjust Al 〉=0.020% in the steel, and guarantee that continuous casting nozzle clogging do not occur and stops watering generation, obtain the good continuously cast bloom of surface quality.
Summary of the invention
The objective of the invention is to, a kind of method that adopts continuous small-billet casting process stabilizing ground to produce the ML12-20Al steel is provided.Under the prerequisite that guarantees technology direct motion, slab quality and good cold heading performance, part replaces the die casting production technique, thereby reduces production costs the rational product of productivity price ratio.
The present invention relates to a kind of production method of continuous small-billet casting low carbon low silicon aluminium killed steel, comprise that desulfurizing iron skims → converter smelting → pushing off the slag tapping → ladle deoxidation alloying → ladle slag upgrading → LF ladle refining → feed Al line, Ca line → steel ladle bottom argon blowing soft blow → full guard casting, it is characterized in that: double-slag operation is adopted in converter, end point carbon is by 0.08～0.18% control, 1640～1680 ℃ of tapping temperatures, the pushing off the slag tapping; Use the Al-Mn-Fe final deoxygenation, add-on 3.0～5.0kg/t steel; Every stove adds 200～400kg synthetic slag; Control the oxygen activity≤10ppm that arrives at a station; The molten aluminium control of smelting process acid is implemented control by different level by middle bag 0.02-0.035%, refining 0.030-0.050% leaving from station, refining the arrive at a station aluminium pattern that adds of 0.025-0.038% of 0.002-0.010% and refining of offing normal; Press the about 0.1 adjustment feeding Ca-Si line of Ca/Als after feeding the Al silk.
Calculate the convertor deacidification alloy addition according to the converter terminal composition, and in tapping process, add binary upgrading slag CaO, 65-85%; CaF2,15-35% and aluminium double-edged fine-toothed comb, refining (FeO+MnO)＜4% in the slag that arrives at a station.
Refining finishes to feed SiCa line 400m/ stove, guarantees Ca/Al 0.09-0.14 in the steel.
Bag is provided with slag blocking wall in the continuous casting; Level 〉=the 670mm of Baogang in the control; Greater than 200mm, middle bag immerses the mouth of a river and inserts the following 120mm of mold liquid level the big bag of strict control long nozzle at the depth of penetration of middle bag liquid level.
The present invention can stablize Als 0.02-0.05% in the control steel, has rewritten the history that domestic little square billet casting machine can not continuous casting Als surpasses 0.006% carbon aluminium-killed steel.ML15Al is superior in quality in trial-production, has formed batch process, is dealt into the user and uses, and reflection is good.
The operational path of this invention:
Desulfurizing iron is skimmed → 80t converter smelting → pushing off the slag tapping → ladle deoxidation alloying → ladle slag upgrading → LF ladle refining, comprises temperature raising, alloy fine setting, desulfurization → hello Al line, Ca line → steel ladle bottom argon blowing soft blow → 130mm 2The square billet casting machine comprises alkaline tundish, filtration barricade, full guard casting, induction stirring → cc billet surface quality inspection.
The main technique measure of this invention:
Double-slag operation is adopted in-converter, and end point carbon is controlled by 0.08～0.18%, 1640～1680 ℃ of tapping temperatures, pushing off the slag tapping.
-use Al-Mn-Fe final deoxygenation, add-on 3.0～5.0kg/t steel.After-blow or end point carbon are low adds iron core aluminium, contains aluminium 50%.The Mn recovery rate is considered by 80%, carbon Mn-Fe polishing during not enough manganese is used.
-every stove adds 200～400kg synthetic slag, adds the aluminium bamboo comb on the top of the slag after having gone out steel in ladle.
-control oxygen activity≤the 10ppm that arrives at a station.Make white slag aluminium amount according to the slag that arrives at a station is thick with the adjustment of converter terminal control situation.
The molten aluminium control of-smelting process acid is implemented control by different level by middle bag 0.02-0.035%, refining 0.030-0.050% leaving from station, refining the arrive at a station aluminium pattern that adds of 0.025-0.038% of 0.002-0.010% and refining of offing normal, and focuses on that refining is arrived at a station and refining is offed normal.
Press Ca/Als about 0.1 behind-hello the Al silk and adjust feeding Ca-Si line, carry out deformation processing of inclusion, the soft blow time is pressed 12-18min control, guarantees the soft blow effect, makes to be mingled with abundant come-up in the steel.And guarantee that continuous casting nozzle clogging do not occur and stops watering generation, obtain the good continuously cast bloom of surface quality.
-adopting the full guard casting, middle bag is provided with slag blocking wall, and crystallizer uses Al 2O 3≤ 4% low carbon protective slag.
-continuous small-billet casting, crystallizer adopts induction stirring.
-strengthen the strand inspection, guarantee that milling train groove, guide and guard etc. are in good condition, guarantee the stocking surface quality.
The strict control of-wire rolling plants billet heating temperature, 1050～1100 ℃ of Heating temperatures, 1000～1050 ℃ of start rolling temperatures, 900～950 ℃ of laying temperatures, air-cooled section blower fan Close All keeps speed of cooling more slowly in the transformation temperature district, guarantees the wire rod performance.
1. finished product composition and Properties Control
Table 1 ML15Al steel chemical composition control %
Grade of steel ???C ??Si ??Mn ?P ??S ??Al ??Fe
?ML15Al ???0.13～ ???0.18 ??≤0.10 ??0.30～ ??0.60 ?≤0.035 ??≤0.035 ??≥0.020 Surplus
Table 2 ML15Al Properties Control
Grade of steel ???σb(Mpa) ???Ψ(％) ???1/2
?ML15Al ???≤520 ???≥50 Qualified
Embodiment
The present invention can implement in Steel Complex, is Shoudu Iron and Steel Co the 3rd steelworks-the 3rd wire rolling plants below, adopts the present invention to produce the example of ML15Al steel.
Operational path is: desulfurizing iron skims → and three steel-making 80t converter smelting → pushing off the slag tapping → ladle deoxidation alloying → ladle slag upgrading → LF ladle refinings → hello Al lines, Ca line → steel ladle bottom argon blowing soft blow → 130mm 2Square billet casting machine → rolling ∮ 6.5～the 14mm of cc billet surface quality inspection → high-speed rod-rolling mill wire rod (or the rolling ∮ 16～25mm of bar and shape mill bar) → slow cooling → finished product packing after rolling.
Converter main technologic parameters such as following table.
Heat The converter terminal temperature (℃) Converter terminal C, (%) Al-Mn-Fe add-on (kg/t) Middle carbon Mn-Fe add-on (kg/t) Iron core Al add-on (kg/t)
??3F3330 ????1680 ????0.08 ???????4.5 ?????????2.5 ??????-
??3E3476 ????1668 ????0.12 ???????4.5 ?????????2.5 ??????-
??3E3475 ????1675 ????0.09 ???????4.5 ?????????2.5 ??????-
??2D10406 ????1680 ????0.06 ???????5.0 ?????????2.5 ??????0.5
??2E10340 ????1680 ????0.08 ???????5.0 ?????????2.5 ??????-
Refining main technique data such as following table.
Heat The refining ao (ppm) that arrives at a station The refining Al (%) that arrives at a station The refining Al (%) that offs normal Refining Al leaving from station (%) Middle bag Al (%) Feed Al line amount (kg/t)
??3F3330 ????3.6 ????0.025 ?????0.008 ????0.042 ????0.039 ????240m
??3E3476 ????6.1 ????0.024 ?????0.007 ????0.039 ????0.037 ????260m
??3E3475 ????3.7 ????0.029 ?????0.004 ????0.033 ????0.029 ????200
??2D10406 ????8.5 ????0.037 ?????0.005 ????0.030 ????0.028 ????300
??2E10340 ????4.5 ????0.031 ?????0.002 ????0.034 ????0.029 ????280
Continuous casting and rolling technological parameter see the following form.
Heat Teeming speed (m/min) Covering slag Induction stirring Tundish temperature (℃) The strand situation Laying temperature (℃)
Electric current Frequency
??3F3330 ????2.4 ??XLD-10 ??220 ??8Hz ????1556 Well ????920
??3E3476 ????2.5 ??XLD-10 ??220 ??8Hz ????1560 Well ????930
??3E3475 ????2.4 ??XLD-10 ??220 ??8Hz ????1558 Well ????920
??2D10406 ????2.5 ??XLD-10 ??220 ??8Hz ????1561 Well ????920
??2E10340 ????2.5 ??XLD-10 ??220 ??8Hz ????1566 Well ????940
Finished product composition and stocking performance see the following form.
Heat Finished product composition (%) The stocking performance
???C ???Si ???Mn ????P ????S ????Al ???σb(Mpa) ????Ψ(％)
??3F3330 ??0.14 ??0.04 ??0.42 ??0.019 ??0.012 ??0.038 ?????420 ??????69
??3E3476 ??0.13 ??0.07 ??0.47 ??0.011 ??0.005 ??0.037 ?????435 ??????69
??3E3475 ??0.13 ??0.06 ??0.45 ??0.013 ??0.011 ??0.029 ?????430 ??????68
??2D10406 ??0.14 ??0.05 ??0.44 ??0.010 ??0.014 ??0.021 ?????435 ??????71
??2E10340 ??0.14 ??0.07 ??0.46 ??0.009 ??0.012 ??0.029 ?????440 ??????66

Claims (4)

1, a kind of continuous small-billet casting low carbon low silicon contains the production method of aluminum steel, comprise that desulfurizing iron skims → converter smelting → pushing off the slag tapping → ladle deoxidation alloying → ladle slag upgrading → LF ladle refining → feed Al line, Ca line → steel ladle bottom argon blowing soft blow → full guard casting, it is characterized in that: double-slag operation is adopted in converter, end point carbon is by 0.08～0.18% control, 1640～1680 ℃ of tapping temperatures, the pushing off the slag tapping; Use the Al-Mn-Fe final deoxygenation, add-on 3.0～5.0kg/t steel; Every stove adds 200～400kg synthetic slag; Control the oxygen activity≤10ppm that arrives at a station; The molten aluminium control of smelting process acid is implemented control by different level by middle bag 0.02-0.035%, refining 0.030-0.050% leaving from station, refining the arrive at a station aluminium pattern that adds of 0.025-0.038% of 0.002-0.010% and refining of offing normal; Press the about 0.1 adjustment feeding Ca-Si line of Ca/Als after feeding the Al silk.
2, continuous small-billet casting low carbon low silicon as claimed in claim 1 contains the production method of aluminum steel, it is characterized in that: calculate the convertor deacidification alloy addition according to the converter terminal composition, and add binary upgrading slag CaO, 65-85% in tapping process; CaF2,15-35% and aluminium double-edged fine-toothed comb, refining (FeO+MnO)＜4% in the slag that arrives at a station.
3, continuous small-billet casting low carbon low silicon as claimed in claim 1 contains the production method of aluminum steel, it is characterized in that: refining finishes to feed SiCa line 400m/ stove, guarantees Ca/Al 0.09-0.14 in the steel.
4, continuous small-billet casting low carbon low silicon as claimed in claim contains the production method of aluminum steel, it is characterized in that: bag is provided with slag blocking wall in the continuous casting; Level 〉=the 670mm of Baogang in the control; Greater than 200mm, middle bag immerses the mouth of a river and inserts the following 120mm of mold liquid level the big bag of strict control long nozzle at the depth of penetration of middle bag liquid level.
CNB031571603A 2003-09-17 2003-09-17 Process for producing steel containing alumium low carbon low ilicon by small square blank continuous caster Expired - Fee Related CN100343397C (en)

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100372948C (en) * 2005-04-22 2008-03-05 涟源钢铁集团有限公司 Low-silicon low-carbon aluminium full killed steel refining method
CN100436603C (en) * 2007-03-28 2008-11-26 北京科技大学 Process of deoxygenating, desulfurizing and controlling non-metal inclusion content in steel
CN100465291C (en) * 2006-12-31 2009-03-04 武汉钢铁(集团)公司 Production tech. of low carbon low silicon aluminium killed steel
CN101586174B (en) * 2009-06-16 2010-09-15 武汉钢铁(集团)公司 Steel two-slag purifying method for ultra-cleaning welding
CN102021273A (en) * 2010-12-30 2011-04-20 安阳钢铁股份有限公司 Fluidness control method of molten low-silicon aluminized steel of square billet
CN102134628A (en) * 2011-03-04 2011-07-27 河北钢铁股份有限公司承德分公司 Smelting method of low-carbon aluminium killed steel with low silicon content
CN102248142A (en) * 2011-06-30 2011-11-23 攀钢集团有限公司 Method for producing medium and low carbon aluminum killed steel
CN102399930A (en) * 2010-09-08 2012-04-04 鞍钢股份有限公司 Method for reducing silicon increase of low-silicon aluminum killed steel
CN102441649A (en) * 2011-11-26 2012-05-09 内蒙古包钢钢联股份有限公司 Production technology of small square billet
CN103614517A (en) * 2013-11-18 2014-03-05 江苏省沙钢钢铁研究院有限公司 Low-cost deoxidation method for low-aluminum medium-carbon steel
CN103627853A (en) * 2013-12-05 2014-03-12 广东韶钢松山股份有限公司 Method for manufacturing low-carbon and low-silicon steel
CN105855494A (en) * 2015-01-23 2016-08-17 鞍钢股份有限公司 Processing method of small overwater square billet casting machine for low-carbon aluminum steel
CN107828932A (en) * 2017-11-16 2018-03-23 武汉钢铁有限公司 A kind of method in the low silicon aluminium killed steel of CSP producing line smelting low carbons
CN108396091A (en) * 2017-02-05 2018-08-14 鞍钢股份有限公司 Smelting method of low-silicon low-aluminum low-oxygen steel
CN109943680A (en) * 2017-12-21 2019-06-28 广东韶钢松山股份有限公司 A kind of Ultra-low carbon, the production method of low silicon, low manganese and low aluminum steel continuous casting billet
CN112267000A (en) * 2020-10-20 2021-01-26 新疆八一钢铁股份有限公司 Short-flow process for producing low-carbon low-silicon aluminum killed steel
CN112792310A (en) * 2020-12-11 2021-05-14 阳春新钢铁有限责任公司 Continuous casting production process for producing low-carbon low-silicon wiredrawing steel at high drawing speed
CN115558837A (en) * 2022-09-15 2023-01-03 安阳钢铁股份有限公司 Method for accurately controlling content of acid-soluble aluminum in common oriented silicon steel CGO smelting process

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JPS52107215A (en) * 1976-03-05 1977-09-08 Sumitomo Metal Ind Ltd Steel refining in converter
JPS59205410A (en) * 1983-05-10 1984-11-21 Nippon Steel Corp Operating process of converter

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CN100372948C (en) * 2005-04-22 2008-03-05 涟源钢铁集团有限公司 Low-silicon low-carbon aluminium full killed steel refining method
CN100465291C (en) * 2006-12-31 2009-03-04 武汉钢铁(集团)公司 Production tech. of low carbon low silicon aluminium killed steel
CN100436603C (en) * 2007-03-28 2008-11-26 北京科技大学 Process of deoxygenating, desulfurizing and controlling non-metal inclusion content in steel
CN101586174B (en) * 2009-06-16 2010-09-15 武汉钢铁(集团)公司 Steel two-slag purifying method for ultra-cleaning welding
CN102399930A (en) * 2010-09-08 2012-04-04 鞍钢股份有限公司 Method for reducing silicon increase of low-silicon aluminum killed steel
CN102399930B (en) * 2010-09-08 2013-08-28 鞍钢股份有限公司 Method for reducing silicon increase of low-silicon aluminum killed steel
CN102021273A (en) * 2010-12-30 2011-04-20 安阳钢铁股份有限公司 Fluidness control method of molten low-silicon aluminized steel of square billet
CN102134628A (en) * 2011-03-04 2011-07-27 河北钢铁股份有限公司承德分公司 Smelting method of low-carbon aluminium killed steel with low silicon content
CN102134628B (en) * 2011-03-04 2013-04-17 河北钢铁股份有限公司承德分公司 Smelting method of low-carbon aluminium killed steel with low silicon content
CN102248142A (en) * 2011-06-30 2011-11-23 攀钢集团有限公司 Method for producing medium and low carbon aluminum killed steel
CN102248142B (en) * 2011-06-30 2013-05-08 攀钢集团有限公司 Method for producing medium and low carbon aluminum killed steel
CN102441649A (en) * 2011-11-26 2012-05-09 内蒙古包钢钢联股份有限公司 Production technology of small square billet
CN103614517A (en) * 2013-11-18 2014-03-05 江苏省沙钢钢铁研究院有限公司 Low-cost deoxidation method for low-aluminum medium-carbon steel
CN103614517B (en) * 2013-11-18 2016-04-27 江苏省沙钢钢铁研究院有限公司 Low-cost deoxidation method for low-aluminum medium-carbon steel
CN103627853A (en) * 2013-12-05 2014-03-12 广东韶钢松山股份有限公司 Method for manufacturing low-carbon and low-silicon steel
CN103627853B (en) * 2013-12-05 2015-12-02 广东韶钢松山股份有限公司 A kind of low-carbon low-silicon steel manufacture method
CN105855494B (en) * 2015-01-23 2019-02-26 鞍钢股份有限公司 Processing method of small overwater square billet casting machine for low-carbon aluminum steel
CN105855494A (en) * 2015-01-23 2016-08-17 鞍钢股份有限公司 Processing method of small overwater square billet casting machine for low-carbon aluminum steel
CN108396091A (en) * 2017-02-05 2018-08-14 鞍钢股份有限公司 Smelting method of low-silicon low-aluminum low-oxygen steel
CN108396091B (en) * 2017-02-05 2020-01-07 鞍钢股份有限公司 Smelting method of low-silicon low-aluminum low-oxygen steel
CN107828932A (en) * 2017-11-16 2018-03-23 武汉钢铁有限公司 A kind of method in the low silicon aluminium killed steel of CSP producing line smelting low carbons
CN107828932B (en) * 2017-11-16 2019-11-26 武汉钢铁有限公司 A method of in the low silicon aluminium killed steel of CSP producing line smelting low carbon
CN109943680A (en) * 2017-12-21 2019-06-28 广东韶钢松山股份有限公司 A kind of Ultra-low carbon, the production method of low silicon, low manganese and low aluminum steel continuous casting billet
CN109943680B (en) * 2017-12-21 2020-12-04 广东韶钢松山股份有限公司 Production method of ultra-low carbon, low silicon, low manganese and low aluminum steel continuous casting billet
CN112267000A (en) * 2020-10-20 2021-01-26 新疆八一钢铁股份有限公司 Short-flow process for producing low-carbon low-silicon aluminum killed steel
CN112792310A (en) * 2020-12-11 2021-05-14 阳春新钢铁有限责任公司 Continuous casting production process for producing low-carbon low-silicon wiredrawing steel at high drawing speed
CN115558837A (en) * 2022-09-15 2023-01-03 安阳钢铁股份有限公司 Method for accurately controlling content of acid-soluble aluminum in common oriented silicon steel CGO smelting process

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