CN101245403A - Oxidized powder preparation for reinforcing liquid steel decarburization - Google Patents
Oxidized powder preparation for reinforcing liquid steel decarburization Download PDFInfo
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- CN101245403A CN101245403A CNA2007100376645A CN200710037664A CN101245403A CN 101245403 A CN101245403 A CN 101245403A CN A2007100376645 A CNA2007100376645 A CN A2007100376645A CN 200710037664 A CN200710037664 A CN 200710037664A CN 101245403 A CN101245403 A CN 101245403A
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Abstract
The invention discloses an oxidizing powder for strengthening molten steel decarbonization and solves the problem of the molten steel decarbonization in process of smelting ultra-low-carbon steel. The oxidizing power includes ingredients: 56-73 percent by weight of Fe2O3, 3-8 percent by weight of MnO, 16-26 percent by weight of CaO, 2-6 percent by weight of MgO, 2-6 percent by weight of SiO2, 0.5-2.0 percent by weight of Al2O3, less than or equal to 0.3 percent by weight of H2O and 0.3-1.0 percent by weight of an organic solvent of silicone oil. In addition, the oxidizing powder of the invention has good moisture resistance and injection performance. The injection at the late stage of the decarbonization reaction can strengthen the vacuum decarbonization reaction of the molten steel in a low-carbon area (with carbon content below 50ppm) so as to ensure that the carbon content of the molten steel is below 10ppm.
Description
Technical field
The present invention relates to process for making, particularly a kind of oxidisability pulvis of strengthening the molten steel decarburization.
Background technology
The task of the smelting suprelow carbon steel of steel making working procedure is further to reduce the carbon content in the steel, the cleanliness factor of raising molten steel etc.
At present, the production route that generally adopts of ultra low-carbon steel is: converter → vacuum circulation degassing (RH) → continuous casting.Yet during the RH vacuum-treat, after the carbon content in the molten steel is reduced to 15～30ppm, reaction between carbon and oxygen speed sharply reduces, there is decarburization stagnation phenomenon, the very fast minimizing of volume transmission quality coefficient of reaction, adopt conventional vacuum cycle decarburization mode to be difficult to the further carbon content that reduces in the molten steel, must seek other means and improve DECARBONIZATION REACTION RATE.
Existing molten steel decarbonization process generally adopts vacuum-treat, does not adopt the decarbonization process that dusts.Mainly be subjected to the restriction of functions of the equipments and powder performance.Foreign patent related to the decarbonization process that dusts, though also obtained certain decarburization effect, it generally adopts sintering breeze, hydrogenous ferric oxide pulvis, contains the single composition pulvis of ferric oxide and nickel oxide etc. etc., the jetting performance of these pulvis, humidity resistance, decarburization effect are general, and the erosion to refractory materials is also more serious, can't satisfy the requirement of ultra low-carbon steel vacuum decarburization technology.
Summary of the invention
At the vacuum decarburization technology of ultra low-carbon steel, a kind of oxidisability pulvis of strengthening the molten steel decarburization of purpose exploitation of the present invention has good moistureproofness and jetting performance; Can strengthen molten steel vacuum decarburization reaction of (the following carbon content of 50ppm), the carbon content of molten steel is reached below the 10ppm in the low-carbon (LC) district.
For achieving the above object, technical scheme of the present invention is, a kind of oxidisability pulvis of strengthening the molten steel decarburization, its composition quality per-cent be,
Fe
2O
3 56～73
MnO 3～8
CaO 16～26
MgO 2～6
SiO
2 2～6
Al
2O
3 0.5～2.0
Organic solvent silicone oil adds, and 0.3～1.0
Surplus is inevitable impurity.
Further, the moisture H in the pulvis of the present invention
2O≤0.3%; The size range of pulvis is at 0.1mm～0.5mm.
The oxide compound pulvis of jetting in molten steel in the low-carbon (LC) district (carbon content is below 0.01% in the molten steel) of vacuum decarburization reaction is a kind of effective means that increases volume transmission quality coefficient.Promptly in the RH vacuum chamber, contain the pulvis of ferric oxide to circulation molten steel winding-up, can provide new oxygen source and decarburizing reaction core, promote decarburizing reaction with this to molten steel by spray gun.The oxide compound pulvis overwhelming majority of winding-up directly enters and is scattered in the molten steel, the reaction interface of powder particle and molten steel is long-pending to be increased greatly, the simultaneous oxidation medicinal powder is higher and can be used as the forming core core of CO bubble as oxygen position, oxygen source surface, promotes the carrying out of reaction between carbon and oxygen greatly.
In the present invention, the Fe in the oxidisability pulvis of reinforcement molten steel decarburization
2O
3Belong to oxidizing substance with MnO, can provide oxygen source and decarburizing reaction core, promote decarburizing reaction with this to molten steel.Fe
2O
3At high temperature generate FeO earlier, participate in decarburizing reaction again, its reaction formula is respectively:
Fe
2O
3+Fe＝3FeO
(FeO，MnO)+[C]＝[Fe，Mn]+CO
Therefore, Fe in the pulvis
2O
3With MnO be the major components of molten steel decarburizing reaction under the vacuum, for vacuum decarburization reaction provides effective oxygen source, increase the interfacial area with the molten steel reaction, must guarantee that its content reaches certain ratio.But Fe in the pulvis
2O
3Then can aggravate refractory corrosion with MnO content is too high, the jetting performance of pulvis also can be affected, and all can influence the technological effect of vacuum decarburization.
In order to improve the jetting performance of the oxidisability pulvis of strengthening the molten steel decarburization, improve the reactivity worth of pulvis, in pulvis, add a certain amount of calcium oxide pulvis, and carry out Passivation Treatment, can increase flowability, the reduction density of powder of pulvis, and pulvis is nonhygroscopic in transportation, storage process, guarantees the reactivity of pulvis and good jetting performance.
In addition,, in pulvis, add a certain proportion of MgO, both can reduce pulvis proportion, also can reach the purpose of protection refractory materials for alleviating the erosion of blowing powder to the soaking tub refractory materials.CaO and MgO play crucial booster action in pulvis, therefore, content all can not be too high, otherwise the vacuum decarburization effect of the oxidisability pulvis of vacuum decarburization can be weakened.
SiO
2Content is 2%～6%, Al
2O
3Content is 0.5%～2.0%, SiO
2And Al
2O
3Bring into by raw material, need be controlled at certain limit.To reducing the pulvis fusing point, promote the pulvis fusing, to form the low melting point inclusion favourable, but can reduce the basicity of slag, influence the deoxidation of molten steel behind the vacuum decarburization.
The content of organic silicone oil is 0.3%～1.0%; after the oxidisability pulvis of vacuum decarburization adds organic silicone oil; Passivation Treatment has been carried out on the pulvis surface, made its surface produce one deck hydrophobic protective layer, and reached moistureproof, improve the pulvis reactivity, improve the purpose of pulvis flowability and jetting performance.
In addition, the present invention still is control, H to the moisture in the pulvis
2O≤0.3%, otherwise the moisture in might pulvis enters molten steel, has increased the burden of vacuum outgas, and also the performance to steel produces harm.
In addition, the present invention also controls the granularity of oxidisability pulvis, too greatly then the possibility reactivity worth is poor for the pulvis particle size, the residence time of pulvis in molten steel is short, and the pulvis particle is too small, and jetting performance is poor, under the vacuum suction condition, be drawn into vacuum system easily, can not participate in reaction, and influence vacuum apparatus, cause equipment failure.The powder granularity scope of the present invention's control is 0.1mm～0.5mm, can guarantee its reactivity, can not influence vacuum apparatus again.
Beneficial effect of the present invention
Pulvis of the present invention adopts compound to make, mainly contain compositions such as ferric oxide, calcium oxide, carry out surface passivation by the organic solvent silicone oil (content is 0.3%～1.0%) that in pulvis, adds minute quantity again and handle, make it have good moistureproofness and jetting performance.In decarburizing reaction later stage winding-up, can strengthen molten steel vacuum decarburization reaction of (the following carbon content of 50ppm) in the low-carbon (LC) district, the carbon content of molten steel is reached below the 10ppm.
Embodiment
Embodiments of the invention are referring to table 1, and under vacuum molten steel are carried out dark decarburization test respectively, can reach the purpose of low-carbon (LC) molten steel (the following carbon content of 50ppm) being strengthened decarburization under vacuum, satisfy the requirement that ultra-low carbon steel is smelted.
Table 1
| Embodiment | Fe 2O 3 | MnO | CaO | MgO | SiO 2 | Al 2O 3 | H 2O | Organic silicone oil | Other |
| 1 | 73.0 | 3.0 | 16.0 | 2.0 | 3.0 | 2.0 | 0.30 | 0.30 | Surplus |
| 2 | 61.5 | 8.0 | 20.0 | 6.0 | 2.0 | 1.0 | 0.28 | 0.60 | Surplus |
| 3 | 56.0 | 6.0 | 26.0 | 3.5 | 6.0 | 0.5 | 0.25 | 1.00 | Surplus |
| 4 | 69.3 | 3.4 | 21.1 | 2.2 | 2.3 | 0.8 | 0.22 | 0.45 | Surplus |
| 5 | 64.2 | 7.6 | 17.3 | 4.5 | 4.1 | 1.2 | 0.21 | 0.68 | Surplus |
| 6 | 65.0 | 4.5 | 18.0 | 7.0 | 3.5 | 1.4 | 0.23 | 0.80 | Surplus |
Implementation result is as follows respectively:
Embodiment 1
The carbon content of molten steel before RH vacuum cycle refining process dusts decarburization is 30ppm, and through after the powder-spraying intensified carbonization treatment, carbon content is reduced to 10ppm in the molten steel;
Embodiment 2
The carbon content of molten steel before RH vacuum cycle refining process dusts decarburization is 23ppm, and through after the powder-spraying intensified carbonization treatment, carbon content is reduced to 8ppm in the molten steel;
Embodiment 3
The carbon content of molten steel before RH vacuum cycle refining process dusts decarburization is 25ppm, and through after the powder-spraying intensified carbonization treatment, carbon content is reduced to 9ppm in the molten steel.
Embodiment 4
The carbon content of molten steel before RH vacuum cycle refining process dusts decarburization is 29ppm, and through after the powder-spraying intensified carbonization treatment, carbon content is reduced to 10ppm in the molten steel.
Embodiment 5
The carbon content of molten steel before RH vacuum cycle refining process dusts decarburization is 21ppm, and through after the powder-spraying intensified carbonization treatment, carbon content is reduced to 7ppm in the molten steel.
In sum, pulvis of the present invention has good moistureproofness and jetting performance, and in the winding-up of decarburizing reaction later stage, the free oxygen in the molten steel is at 300ppm～450ppm, can strengthen molten steel vacuum decarburization reaction of (the following carbon content of 50ppm), the carbon content of molten steel is reached below the 10ppm in the low-carbon (LC) district.
Claims (3)
1. oxidisability pulvis of strengthening the molten steel decarburization, its composition quality per-cent be,
Fe
2O
3 56～73
MnO 3～8
CaO 16～26
MgO 2～6
SiO
2 2～6
Al
2O
3 0.5～2.0
Organic solvent silicone oil adds, and 0.3～1.0
Surplus is inevitable impurity.
2. the oxidisability pulvis of reinforcement molten steel as claimed in claim 1 decarburization is characterized in that, H in this pulvis
2O≤0.3%.
3. the oxidisability pulvis of reinforcement molten steel as claimed in claim 1 decarburization is characterized in that the size range of this pulvis is at 0.1mm～0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100376645A CN100560745C (en) | 2007-02-16 | 2007-02-16 | A kind of oxidisability pulvis of strengthening the molten steel decarburization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100376645A CN100560745C (en) | 2007-02-16 | 2007-02-16 | A kind of oxidisability pulvis of strengthening the molten steel decarburization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101245403A true CN101245403A (en) | 2008-08-20 |
| CN100560745C CN100560745C (en) | 2009-11-18 |
Family
ID=39946082
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100376645A Active CN100560745C (en) | 2007-02-16 | 2007-02-16 | A kind of oxidisability pulvis of strengthening the molten steel decarburization |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899451A (en) * | 2012-10-23 | 2013-01-30 | 鞍钢股份有限公司 | Premelting slag for electrochemical decarburization and preparation method thereof |
| CN108929934A (en) * | 2018-07-03 | 2018-12-04 | 北京北冶功能材料有限公司 | A kind of decarburization smelting process of iron-nickel alloy reclaimed materials |
| CN112442575A (en) * | 2020-10-29 | 2021-03-05 | 任志峰 | RH vacuum refining method of ultra-low carbon stainless steel |
| CN113337678A (en) * | 2021-05-25 | 2021-09-03 | 江苏省沙钢钢铁研究院有限公司 | Refining method for RH rapid decarburization |
-
2007
- 2007-02-16 CN CNB2007100376645A patent/CN100560745C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102899451A (en) * | 2012-10-23 | 2013-01-30 | 鞍钢股份有限公司 | Premelting slag for electrochemical decarburization and preparation method thereof |
| CN102899451B (en) * | 2012-10-23 | 2015-09-02 | 鞍钢股份有限公司 | Premelting slag for electrochemical decarburization and preparation method thereof |
| CN108929934A (en) * | 2018-07-03 | 2018-12-04 | 北京北冶功能材料有限公司 | A kind of decarburization smelting process of iron-nickel alloy reclaimed materials |
| CN112442575A (en) * | 2020-10-29 | 2021-03-05 | 任志峰 | RH vacuum refining method of ultra-low carbon stainless steel |
| CN113337678A (en) * | 2021-05-25 | 2021-09-03 | 江苏省沙钢钢铁研究院有限公司 | Refining method for RH rapid decarburization |
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| Publication number | Publication date |
|---|---|
| CN100560745C (en) | 2009-11-18 |
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