CN102321778A - Method of deoxidation of medium carbon aluminum-containing steel in converter - Google Patents
Method of deoxidation of medium carbon aluminum-containing steel in converter Download PDFInfo
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- CN102321778A CN102321778A CN201110283535A CN201110283535A CN102321778A CN 102321778 A CN102321778 A CN 102321778A CN 201110283535 A CN201110283535 A CN 201110283535A CN 201110283535 A CN201110283535 A CN 201110283535A CN 102321778 A CN102321778 A CN 102321778A
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Abstract
A method of deoxidation of medium carbon aluminum-containing steel in a converter belongs to the technical field of converter steel-making. The process particularly comprises the following steps: adding carbon materials for deoxidation during converter tapping, wherein the carbon materials are respectively A and B, and A is carbon powder with a main component of C element and with a purity of more than 90%, and B is calcium carbide particles with a diameter of between 1 mm-5 mm; when A or B is added, increasing the argon flow of ladle bottom blowing to reach the effect of molten steel surface surge, wherein the on-line ladle bottom blowing argon intensity is between 0.01 L/t.min-0.1 L/t.min; after the addition of A or B is finished, adding Al alloy and Si, Mn ferroalloy when the mass of the tapping molten steel is 40%-70% of the total mass, performing deep deoxidation and alloying. The advantages are that the deoxidation process can give full play to the deoxidation capability of the carbon element, and has active effect on improving molten steel quality, and reducing the stay of metals and nonmetal oxides in the molten steel.
Description
Technical field
The invention belongs to the converter steeling technology field, provide a kind of middle carbon to contain the method for aluminum steel convertor deacidification especially.Through adding earlier the material of carbonaceous element, like carbon dust etc., and then add the Al alloy, make in the steel oxygen fully with the carbon reaction, can effectively reduce the add-on of Al alloy type reductor, thus reduction reductor cost.
Background technology
After macroelement in the molten steel is oxidized; Contain 0.02～0.08% oxygen in the molten steel; Need to remove, deoxidation process also is the process that inclusion generates, and adds Al iron or AlMn iron when containing main deoxidation mode that aluminum steel adopts for tapping; Make oxygen and Al element generation oxidizing reaction in the steel, generate Al
2O
3Type impurity, Al
2O
3Type impurity content height causes the reduction of performances such as stretching, toughness easily, if molten steel do not carry out deoxidation, then just has during the molten steel crystallization to be prone to hold a type eutectic and to separate out from crystal boundary, produces hot-short.Generally, the deoxidization technique that middle carbon contains the employing of Al steel is in tapping process, to add Al iron and other alloys etc.; It is the Al element that reductor and alloy get into the later at first oxidized deoxidant element of molten steel; Other elements only have small amounts, so the Al element bearing the role of reductor basically, and metal A l market value is higher; Ton aluminium reaches more than 20,000 yuan, and it is significant for steel enterprise therefore to reduce aluminium consumption.
The present invention adopts new deoxidization technique, at first adds the material of carbonaceous element, like carbon dust etc., and then adds the Al alloy, make oxygen in the steel fully with the element reaction of carbon, can effectively reduce the add-on of Al alloy type reductor, thus reduction reductor cost.
The new oxide compound that deoxidant element forms becomes deoxidation products, and deoxidation products can be got rid of from molten steel, also can be through spreading to the low reductibility slag of content.The element deoxidizing capacity is strong more, and the concentration of the oxygen that then balances each other with each element of same amount is just low more, and the deoxidizing capacity size ordering of each element commonly used is: Al＞C.But the deoxidizing capacity of carbon is just strong more under the high more situation of temperature.The deoxidation products of carbon is gas CO; The solubleness of gas CO is very little in the molten steel, therefore utilizes the carbon deoxidation can reduce the inclusion in the molten steel, and the carbonaceous element is than low on the alloying element cost simultaneously; Therefore; Through inventing a kind of new deoxidization technique, the deoxidizing capacity of giving full play to the carbonaceous element reduces metal and the stop of nonmetal oxide in molten steel and plays a positive role for improving steel quality; In addition, use the deoxidation of carbonaceous element can also play the effect that reduces the reductor cost.
Summary of the invention
The object of the present invention is to provide a kind of middle carbon to contain the method for aluminum steel convertor deacidification.Solved in the deoxidation process with the duraluminum class as the high problem of reductor cost.
Concrete process step of the present invention is following:
(1) when converter tapping molten steel amount is the 1/3-1/6 of total molten steel amount, add blacking and carry out deoxidation, blacking divides two kinds, is respectively A and B; Wherein A is a carbon dust, mainly consists of the C element, and carbon dust purity is greater than 90%; B is the carbide of calcium particle, and the carbide of calcium particle diameter is between 1mm～5mm;
Add-on is as between ton steel 0.1kg～0.8kg when using A, and add-on is as between ton steel 0.2kg～1.2kg when using B;
When (2) adding A or B, improve the ladle bottom blowing argon flow amount, reach molten steel surface and spring up effect, online ladle bottom blowing argon gas intensity is between 0.01L/ (t.min)～0.1L/ (t.min);
(3) A or B add finish after, the tapping steel quality accounts for and adds Al alloy and Si, Mn iron alloy between the 40%-70% of total amount again, carries out deep deoxidation and alloying.
After tapping, can add A and B simultaneously, at this moment, the ton steel add-on of A and B respectively reduces by half, and the add-on of A is between ton steel 0.05kg～0.4kg, and the add-on of B is between ton steel 0.1kg～0.6kg;
When tapping carbon content when being lower than 0.02%, at first add and contain the fine aluminium amount and carry out deoxidation at the Al of 0.1kg/t～0.3kg/t alloy or fine aluminium, prevent the molten steel accident generation of " turning over bag ";
The invention has the advantages that: this deoxidization technique can be given full play to the deoxidizing capacity of carbonaceous element, for improving steel quality, reduces metal and the stop of nonmetal oxide in molten steel and plays a positive role; In addition, use the deoxidation of carbonaceous element can also play the effect that reduces the reductor cost.
Embodiment
Embodiment 1:
Contain the smelting of aluminum steel D32-1, the adopting process route: desulfurizing iron pre-treatment-converter-LF refining-cast.Process parameter is as shown in table 1.
Table 1
Converter tapping amount 100t decides oxygen to molten steel behind the converter catch carbon, and oxygen level is 719ppm; Carbon content of molten steel is 0.04%, and 1670 ℃ of converter tapping temperature go out steel quality 1/6 o'clock adding A blacking 20kg of steel quality extremely always; Steel quality to be gone out accounts for 1/2 o'clock adding alloy of total tap: Al iron 316kg, mid-carbon fe-mn 604kg, ferro-silico-manganese 1023kg; Sampling after tapping finishes, carbon content of molten steel increases to 0.07%; Wherein, mid-carbon fe-mn carburetting 0.01%, ferro-silico-manganese carburetting 0.02%, the 20kg carbon dust that the back that is equivalent to tap adds is used for deoxidation basically.
Embodiment 2:
Contain the smelting of aluminum steel Q345R, the adopting process route: desulfurizing iron pre-treatment-converter-LF refining-cast.Process parameter is as shown in table 2.
Table 2
Converter tapping amount 100t decides oxygen to molten steel behind the converter catch carbon, and oxygen level is 1094ppm; Carbon content of molten steel is 0.03%, and 1725 ℃ of converter tapping temperature add B blacking 30kg when going out 1/5 left and right sides of steel quality to total steel quality; The back adds alloy: high carbon ferromanganese iron 492kg; Ferro-silico-manganese 1015kg, sampling after tapping finishes, carbon content of molten steel increases to 0.08%; Wherein, theoretical high carbon ferromanganese carburetting 0.03%, ferro-silico-manganese carburetting 0.02%, actual carburetting is equivalent to 0.03%, has the carbonaceous element that is equivalent to 20kg oxidized.
Claims (4)
1. carbon contains the method for aluminum steel convertor deacidification in one kind, and it is characterized in that: process step is following,
(1) when converter tapping molten steel amount is the 1/3-1/6 of total molten steel amount, add blacking and carry out deoxidation, blacking divides two kinds, is respectively A and B; Wherein A is a carbon dust, mainly consists of the C element, and carbon dust purity is greater than 90%; B is the carbide of calcium particle, and the carbide of calcium particle diameter is between 1mm～5mm;
When (2) adding A or B, improve the ladle bottom blowing argon flow amount, reach molten steel surface and spring up effect, online ladle bottom blowing argon gas intensity is between 0.01L/t.min～0.1L/t.min;
(3) A or B add finish after, the tapping steel quality accounts for and adds Al alloy and Si, Mn iron alloy between the 40%-70% of total amount again, carries out deep deoxidation and alloying.
2. method according to claim 1 is characterized in that: add-on is as between ton steel 0.1kg～0.8kg when using A, and add-on is as between ton steel 0.2kg～1.2kg when using B.
3. method according to claim 1 is characterized in that: when adding A and B simultaneously, the ton steel add-on of A and B respectively reduces by half, and the add-on of A is between ton steel 0.05kg～0.4kg, and the add-on of B is between ton steel 0.1kg～0.6kg.
4. method according to claim 1 is characterized in that: the tapping carbon content is lower than at 0.02% o'clock, at first adds to contain the fine aluminium amount and carry out deoxidation at the Al of 0.1kg/t～0.3kg/t alloy or fine aluminium.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110283535A CN102321778A (en) | 2011-09-22 | 2011-09-22 | Method of deoxidation of medium carbon aluminum-containing steel in converter |
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| CN201110283535A CN102321778A (en) | 2011-09-22 | 2011-09-22 | Method of deoxidation of medium carbon aluminum-containing steel in converter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014235A (en) * | 2013-01-07 | 2013-04-03 | 河北钢铁股份有限公司唐山分公司 | Deoxidizing process for reducing consumption of aluminum killed steel deoxidizing agent |
| CN104561444A (en) * | 2014-12-22 | 2015-04-29 | 武汉钢铁(集团)公司 | Method for removing excessive oxygen in steel tapping process of low-carbon aluminum killed steel |
| CN107245547A (en) * | 2017-04-27 | 2017-10-13 | 河钢股份有限公司承德分公司 | A kind of method of Aluminum steel slow release deoxidizing and application |
| CN108588333A (en) * | 2016-04-21 | 2018-09-28 | 日照宝华新材料有限公司 | A kind of inexpensive deoxidization technique of pneumatic steelmaking |
| CN109182649A (en) * | 2018-09-06 | 2019-01-11 | 山西通才工贸有限公司 | A kind of low-alloy steel method of deoxidation |
| CN109487033A (en) * | 2018-12-16 | 2019-03-19 | 河钢股份有限公司承德分公司 | A method of dilution aluminum shot deoxidation agent |
| CN114032356A (en) * | 2021-11-16 | 2022-02-11 | 山东钢铁集团日照有限公司 | Low-cost composite pre-deoxidation method for molten steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914652A (en) * | 2010-08-27 | 2010-12-15 | 唐山国丰钢铁有限公司 | Low-carbon and low-silicon steel deoxidation process |
-
2011
- 2011-09-22 CN CN201110283535A patent/CN102321778A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914652A (en) * | 2010-08-27 | 2010-12-15 | 唐山国丰钢铁有限公司 | Low-carbon and low-silicon steel deoxidation process |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014235A (en) * | 2013-01-07 | 2013-04-03 | 河北钢铁股份有限公司唐山分公司 | Deoxidizing process for reducing consumption of aluminum killed steel deoxidizing agent |
| CN103014235B (en) * | 2013-01-07 | 2014-07-02 | 河北钢铁股份有限公司唐山分公司 | Deoxidizing process for reducing consumption of aluminum killed steel deoxidizing agent |
| CN104561444A (en) * | 2014-12-22 | 2015-04-29 | 武汉钢铁(集团)公司 | Method for removing excessive oxygen in steel tapping process of low-carbon aluminum killed steel |
| CN108588333A (en) * | 2016-04-21 | 2018-09-28 | 日照宝华新材料有限公司 | A kind of inexpensive deoxidization technique of pneumatic steelmaking |
| CN107245547A (en) * | 2017-04-27 | 2017-10-13 | 河钢股份有限公司承德分公司 | A kind of method of Aluminum steel slow release deoxidizing and application |
| CN109182649A (en) * | 2018-09-06 | 2019-01-11 | 山西通才工贸有限公司 | A kind of low-alloy steel method of deoxidation |
| CN109487033A (en) * | 2018-12-16 | 2019-03-19 | 河钢股份有限公司承德分公司 | A method of dilution aluminum shot deoxidation agent |
| CN114032356A (en) * | 2021-11-16 | 2022-02-11 | 山东钢铁集团日照有限公司 | Low-cost composite pre-deoxidation method for molten steel |
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Application publication date: 20120118 |