CN102776321A - Novel calcium-adding method for preventing nozzle clogging of steel furnace continuous casting - Google Patents

Novel calcium-adding method for preventing nozzle clogging of steel furnace continuous casting Download PDF

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CN102776321A
CN102776321A CN201110120621XA CN201110120621A CN102776321A CN 102776321 A CN102776321 A CN 102776321A CN 201110120621X A CN201110120621X A CN 201110120621XA CN 201110120621 A CN201110120621 A CN 201110120621A CN 102776321 A CN102776321 A CN 102776321A
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calcium
molten steel
silicon
steel
content
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姜英禹
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Baosteel Group Xinjiang Bayi Iron and Steel Co Ltd
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Baosteel Group Xinjiang Bayi Iron and Steel Co Ltd
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Abstract

The invention provides a novel calcium-adding method for preventing nozzle clogging of steel furnace continuous casting, to measure the content of Al2O3 in molten steel, to calculate the content of CaO in the molten steel according to a proportion of CaO and Al2O3 in C12A7(12CaO-7Al2O3), and to calculate the adding amount of calcium-silicon wire, calcium-ion wire, calcium-silicon powder and other alloys according to the content of CaO needed by the molten steel and yield of calcium element, respectively. The method comprises a first step of measuring the content of Al2O3 in the molten steel and calculating the required content of CaO in the molten steel; a second step of calculating the content of Ca element needed to be added in molten steel according to the required content of CaO the molten steel; and a third step of calculating the adding amount of alloys (calcium-silicon wire, calcium-ion wire and calcium-silicon powder) according to the content of Ca element needed to be added. Nozzle clogging times of producing gear steel, spring steel and sucker rod steel by the method is reduced to 0 from original 3-4. The method can provide automatic and programmed control operation, and has important production practical value.

Description

A kind of steel stove continuous casting water gap dross that prevents adds the novel method of calcium
Technical field
The present invention relates to the smelting of molten steel, especially improvement contains aluminum steel continous casting sprue dross, and it adds the calcium amount through calculation control, can effectively prevent dystectic solid-state aluminium sesquioxide (Al 2O 3) generation, ensure the output and the quality of steel.
Background technology
For deoxidation effect and the good punching performance of steel that guarantees molten steel, need aluminium (Al be dissolved in the acid in the steel usually s) content is controlled at 0.006%～0.065%, but secondary oxidation very easily takes place because aluminium is dissolved in the acid in the molten steel, generate dystectic solid-state aluminium sesquioxide (Al 2O 3), cause nozzle clogging in the casting process, influence the output and the quality of steel; Contain aluminum steel continous casting sprue dross problem in order to solve, common way is molten steel to be carried out calcium handle, and promptly through in molten steel, adding a certain amount of calcium (Ca) element, impels the solid-state Al in the steel 2O 3Be transformed into liquid C 12A 7(12CaO-7Al 2O 3), thereby prevent nozzle clogging; But the calcium that actually in molten steel, adds how much quantity could form Ca 12Al 7, never have method of quantitative calculation.
At present domestic prevent nozzle clogging generally adopt below several kinds of modes:
1) adding calcium in the molten steel, to be not less than 0.0020% be to obtain the good necessary minimum quantity of continuous-casting conditions.Document (chief editor Wang Jianying, " Sweden's special steel production technology ", Ministry of Metallurgical Industry's special steel Information Network, in September, 1998, P160).
2) add calcium in the molten steel, guarantee [Ca]/[O]=0.6～1.0 in the molten steel.Document (chief editor Lu Shengyi, " continuous casting billet quality ", metallurgical industry press, Beijing,, P274～334 in 2000).
3) add calcium in the molten steel, guarantee [Ca]/[Al]=0.13 in the molten steel.Document (chief editor Lu Shengyi, " continuous casting billet quality ", metallurgical industry press, Beijing,, P274～334 in 2000).
4) in molten steel, add calcium, guarantee that the calcium contents in the molten steel is 0.002%～0.0035%, can avoid nozzle clogging and corrode stopper.Document (chief editor does brave, " steel smelting-continuous casting new technology 800 is asked " metallurgical industry press, and Beijing, 2004, P191).
Above-mentioned method all is to add calcium by rule of thumb, and it is excessive that the calcium in the molten steel adds, and not only causes very big waste but also can in steel, generate solid-state sulfurated lime (CaS), also can cause nozzle clogging; The calcium add-on is not enough in the molten steel, can not generate Ca 12Al 7Thereby can not prevent nozzle clogging.
The calcium adding method of improvement dross of the present invention is with the Al in the molten steel 2O 3As basis, try to achieve the interpolation quantity of silicon-calcium wire quantity or calcium iron wire or silicon calcium powder, can solve the continous casting sprue dross problem that contains aluminum steel well, the consumption of month saving silicon-calcium wire is to 10-20% simultaneously.
Summary of the invention
The objective of the invention is to: solve the problem that contains aluminum steel continous casting sprue dross, promptly the add-on of calcium is carried out accurate calculation, the waste that can reduce valuable alloy can well prevent to contain aluminum steel continous casting sprue dross problem again.
The objective of the invention is to realize like this: prevent that steel stove continuous casting water gap dross from adding the novel method of calcium, records the Al in the molten steel through stove 2O 3Content is then according to C 12A 7(12CaO-7Al 2O 3) middle CaO and Al 2O 3Proportion calculates the content of CaO required in the molten steel, again according to the yield of content and the calcium constituent of required CaO in the molten steel, calculates the add-on of silicon-calcium wire, calcium iron wire, silicon calcium powder or other alloys respectively; The one of which step is chemically examined A in the molten steel that obtains with the stokehold L2O 3Cubage goes out the content of required CaO in the molten steel; Its two step calculates the amount that needs the Ca element of interpolation in the molten steel with the content of required CaO in the molten steel; Its three Ca with needs interpolation in the molten steel measures, and calculates the add-on of alloy (silicon-calcium wire, calcium iron wire, silicon calcium powder).
Calculating principle of the present invention: calculate C through molecular weight 12A 7The ratio that middle CaO occupies is 48.5%, Al 2O 3The ratio of occupying is 51.5%; Al in the molten steel 2O 3Content can obtain through chemical examination before the steel melting furnace, therefore, as long as know Al in the molten steel 2O 3Content just can calculate and generate C 12A 7The amount of needed CaO and the add-on of Ca.
Adopt the nozzle clogging number of times of Pinion Steel that this method makes production, be reduced to 0～2 time: the nozzle clogging number of times of producing spring steel is reduced to 0 time by original average per tour 0～2 time by original per tour average for 3～4 times; The nozzle clogging number of times of producing pumping rod is reduced to 0 time by original average per tour 0～2 time; , this method can provide robotization or sequencing red-tape operati, and important production practical value is arranged, and shows technical progress.
 
Embodiment
Control Example of the present invention is described further.
The calculation procedure of the inventive method:
The first step: with 1 ton of molten steel is example, calculates the content of CaO in the molten steel; Al in the molten steel 2O 3Content can obtain through chemical examination before the steel melting furnace, is generally 0.002%～0.007%; If with the Al in the molten steel 2O 3Content is 0.003% for example, then with 0.003% Al in the molten steel 2O 3All generate C 12A 7The time, the amount of needed CaO is in the molten steel:
If: generate C 12A 7The weight of required CaO is x, then:
12CaO?：7Al 2O 3=48.5%?：51.5%
x ：0.003%=48.5%?：51.5%
x=0.0028%
Promptly generate C 12A 7The weight of required CaO is molten steel 0.028kg per ton.
Second step: when calculating the CaO of molten steel generation 0.028kg per ton, the weight of needed Ca in the molten steel.
If: the weight that every t molten steel generates the needed Ca of CaO of 0.028kg is x (kg), is then calculated by chemical equation:
Ca + O = CaO
40 56
x 0.028kg
x=40×0.028(kg)/56=0.020(kg)
The weight that is required Ca is 0.020kg/t, that is to say that the Ca content in the molten steel should reach 0.002%.
The 3rd step: when the calcium contents in the molten steel requires to be 0.002%, need the silicon-calcium wire of adding or the quantity of calcium iron wire or silicon calcium powder to be:
(1) calculating of the add-on of silicon-calcium wire
The steel grade of confirming, Ca adds in the molten steel through silicon-calcium wire; Silicon-calcium wire also is cored-wire, and skin is a circle iron sheet, and core is a silicon calcium powder, and its composition is: Ca=28%, Si=56%; The diameter of silicon-calcium wire is 13mm, and the weight of silicon calcium powder is 220g/m, and the average yield of Ca element is 8%～13%, if the yield of Ca is with 8% calculating, then:
If the silicon-calcium wire quantity that every t molten steel need add is x (m), the silicon-calcium wire quantity that then adds is:
x（m）×0.22（kg/t）×28%×8%=0.020（kg/t）
x（m）=0.020（kg/t）/[0.22（kg/t）×28%×8%]=4.1m
Content is 0.003% Al in molten steel 2O 3All convert C to 12A 7, when promptly the yield of calcium was calculated with 8%, molten steel per ton need add silicon-calcium wire 4.1m.
(2) calculating of the add-on of calcium iron wire
To low silicon aluminium killed steel, Ca adds in the molten steel through the calcium iron wire; The calcium iron wire also is a kind of cored-wire, and skin is a circle iron sheet, and core is a calcium powder, and its composition is: Ca=40%, Fe=60%; The diameter of calcium iron wire is 13mm, and the weight of calcium iron powder is 220g/m, and the average yield of Ca element is 8%～13%, if the yield of Ca is with 8% calculating, then:
If the calcium iron wire quantity that every t molten steel need add is x (m), the calcium iron wire quantity that then adds is:
x（m）×0.22（kg/t）×40%×8%=0.020（kg/t）
x（m）=0.020（kg/t）/[0.22（kg/t）×40%×8%]=2.8m
Content is 0.003% Al in molten steel 2O 3All convert C to 12A 7The time, promptly the yield of calcium is calculated with 8%, and molten steel per ton need add calcium iron wire 2.8m.
(3) add-on of silicon calcium powder is calculated
When adding silicon calcium powder in the molten steel, directly spray into through isolated plant and to get final product; Its composition is: Ca=28%, and Si=50%～65%, the granularity requirements of silicon calcium powder is less than 2mm; During the winding-up silicon calcium powder, the average yield of Ca element is 5%～10%, if the yield of Ca is according to 5% calculating, then:
If the quantity of the silicon calcium powder that every t molten steel need spray into is x (kg), the quantity of the silicon calcium powder that then need spray into is:
x（kg）×28%×5%=0.020（kg/t）
x（kg）=0.020（kg/t）/（28%×5%）=1.4kg
Content is 0.003% Al in molten steel 2O 3All convert C to 12A 7The time, promptly the yield of calcium is calculated according to 5%, and molten steel per ton need spray into silicon calcium powder 1.4kg.
The manufacturer of above-mentioned silicon-calcium wire is that Sichuan Yingjing, flat interest are wide etc.; The manufacturer of silicocalcium (powder) is Henan Xixia Mine west guarantor etc.; The manufacturer of calcium iron wire is a packet header rel moral etc.; Said product is all carried out national standard or industry standard.
The applicable elements of this novel method:
1) liquid steel temperature is not less than 1500 ℃; Must under the good white slag of deoxidation, add; Sulphur content in the molten steel is not more than 0.010%; Aluminium content 0.006%～0.065% in the molten steel;
2) smelting equipment that is suitable for: the LF refining furnace of various capacity, VD vacuum refining furnace, RH vacuum refining furnace.
3) steel grade that is suitable for: all kinds of aluminum steels that contain such as spring steel, structural alloy steel, carbon aluminium-killed steel, carbon constructional quality steel, oil pipeline steel, beam steel, HSLA.

Claims (4)

1. one kind prevents that the continous casting sprue dross from adding the novel method of calcium; It is characterized in that: with 1 ton of molten steel is example, is not less than 1500 ℃ at liquid steel temperature, under the condition of its sulphur content≤0.010%, aluminium content 0.006-0.065%; Add silicon-calcium wire, calcium iron wire, silicon calcium powder, its dosage calculates as follows:
The first step: record Al in the molten steel 2O 3Content be 0.002-0.007%; With Al 2O 3Content is 0.003% for example, then 0.003% Al in the molten steel 2O 3All generate C 12A 7The time, need the amount of CaO to be in the molten steel:
If: generate C 12A 7The weight of required CaO is x, then:
12CaO?：7Al 2O 3=48.5%?：51.5%
x ：0.003%=48.5%?：51.5%
x=0.0028%
Promptly get C 12A 7The weight of required CaO is molten steel 0.028kg per ton;
Second step: when calculating the CaO of molten steel generation 0.028kg per ton, need the weight of Ca in the molten steel;
If: the weight that every t molten steel generates the needed Ca of CaO of 0.028kg is x, is then calculated by chemical equation:
Ca + O = CaO
40 56
x 0.028kg
x=40×0.028kg/56=0.020kg
The weight that promptly gets Ca is 0.020kg/t, and then the Ca content in the molten steel is 0.002%;
The 3rd step: the calcium contents in the molten steel is 0.002% o'clock, and the quantity of the silicon-calcium wire of adding or calcium iron wire or silicon calcium powder is:
(1) calculating of the add-on of silicon-calcium wire
The molten steel class is confirmed, adds Ca through silicon-calcium wire; Its composition is: Ca=28%, Si=56%; Weight is 220g/m; The average yield of Ca is 8-13%, is 8% to calculate with the yield of Ca, then:
If: it is x (m), the then add-on of silicon-calcium wire that every t molten steel adds silicon-calcium wire quantity:
x×0.22kg/t×28%×8%=0.020kg/t
x=0.020kg/t/[0.22kg/t×28%×8%]=4.1m
With content in the molten steel 0.003% A L2O 3All convert C to 12A 7The time, when promptly the yield of calcium was calculated with 8%, it was 4.1m that molten steel per ton adds the silicon-calcium wire amount;
(2) calculating of the add-on of calcium iron wire
To low silicon aluminium killed steel water, add Ca through the calcium iron wire; Its composition is: Ca=40%, Fe=60%; Weight is 220g/m; The average yield of Ca element is 8-13%, if the yield of Ca is with 8% calculating, then:
If: it is x (m), the then add-on of calcium iron wire that every t molten steel adds calcium iron wire quantity:
x×0.22kg/t×40%×8%=0.020kg/t
x=0.020kg/t/[0.22kg/t×40%×8%]=2.8m
Content is 0.003% Al in molten steel 2O 3All convert C to 12A 7The time, promptly the yield of calcium is calculated with 8%, and the amount that molten steel per ton adds the calcium iron wire is 2.8m;
(3) add-on of silicon calcium powder is calculated
Confirm that molten steel adds silicon calcium powder, adopt powder spraying pot directly to spray into; Its composition is: Ca=28%, and Si=50-65%, the granularity of silicon calcium powder is less than 2mm; Winding-up is during silicon calcium powder, and the average yield of Ca is 5-10%, is 5% to calculate with the yield of Ca, then:
If: the quantity that every t molten steel sprays into silicon calcium powder is x (kg), the then straying quatity of silicon calcium powder:
x×28%×5%=0.020kg/t
x=0.020kg/t/（28%×5%）=1.4kg
Content is 0.003% Al in molten steel 2O 3All convert C to 12A 7The time, promptly the yield of calcium is calculated with 5%, and the amount that molten steel per ton sprays into silicon calcium powder is 1.4kg.
2. according to the said novel method of claim 1, it is characterized in that: this method is equally applicable to LF refining furnace, VD vacuum refining furnace, RH vacuum refining furnace.
3. according to the said novel method of claim 1, it is characterized in that: the steel grade that is suitable for has: the steel of spring steel, structural alloy steel, carbon aluminium-killed steel, carbon constructional quality steel, oil pipeline steel, beam steel, low-alloy high-strength.
4. according to the said novel method of claim 1, it is characterized in that: the silicon-calcium wire of selecting for use, calcium iron wire, silicon calcium powder are the commercially available prod.
CN201110120621XA 2011-05-11 2011-05-11 Novel calcium-adding method for preventing nozzle clogging of steel furnace continuous casting Pending CN102776321A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104212940A (en) * 2014-09-15 2014-12-17 首钢总公司 Method for preventing sulphureous gear steel SAE8620H from clogging nozzle
CN106270422A (en) * 2016-09-20 2017-01-04 河钢股份有限公司承德分公司 Improve high-carbon steel continuous casting and open the method watering effect
CN111230054A (en) * 2020-03-11 2020-06-05 柳州钢铁股份有限公司 Method for cleaning slag adhered to bottom of steel ladle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1916190A (en) * 2006-08-31 2007-02-21 杨堃 Compound deoxidizer in calcium series
CN101935738A (en) * 2010-06-01 2011-01-05 山西太钢不锈钢股份有限公司 Method for feeding silico-calcium core-spun yarn

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1916190A (en) * 2006-08-31 2007-02-21 杨堃 Compound deoxidizer in calcium series
CN101935738A (en) * 2010-06-01 2011-01-05 山西太钢不锈钢股份有限公司 Method for feeding silico-calcium core-spun yarn

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
姜英禹: "齿轮钢20CrMnTi水口堵塞原因分析与改进", 《新疆钢铁》, no. 3, 30 September 2010 (2010-09-30), pages 36 - 38 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104212940A (en) * 2014-09-15 2014-12-17 首钢总公司 Method for preventing sulphureous gear steel SAE8620H from clogging nozzle
CN104212940B (en) * 2014-09-15 2016-06-01 首钢总公司 Prevent the method blocking the mouth of a river containing sulphur Pinion Steel SAE8620H
CN106270422A (en) * 2016-09-20 2017-01-04 河钢股份有限公司承德分公司 Improve high-carbon steel continuous casting and open the method watering effect
CN111230054A (en) * 2020-03-11 2020-06-05 柳州钢铁股份有限公司 Method for cleaning slag adhered to bottom of steel ladle
CN111230054B (en) * 2020-03-11 2021-04-06 柳州钢铁股份有限公司 Method for cleaning slag adhered to bottom of steel ladle

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Application publication date: 20121114