CN104368778A - Peritectic steel covering slag containing multiple metal oxides - Google Patents
Peritectic steel covering slag containing multiple metal oxides Download PDFInfo
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- CN104368778A CN104368778A CN201410637088.8A CN201410637088A CN104368778A CN 104368778 A CN104368778 A CN 104368778A CN 201410637088 A CN201410637088 A CN 201410637088A CN 104368778 A CN104368778 A CN 104368778A
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- covering slag
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses peritectic steel covering slag containing multiple metal oxides. According to chemical ingredients of the corresponding type of steel, 0.08-0.22% of C is included, Si is smaller than or equal to 0.30%, S is smaller than or equal to 0.045%, and P is smaller than or equal to 0.045%. The peritectic steel covering slag is characterized in that, according to the chemical ingredients of the covering slag, by weight ratio, CaO is larger than or equal to 30% and smaller than or equal to 40%, SiO2 is larger than or equal to 20% and smaller than or equal to 30%, F- is larger than or equal to 6.5% and smaller than or equal to 7.5%, Na2O is larger than or equal to 10% and smaller than or equal to 15%, MgO is larger than or equal to 2% and smaller than or equal to 3%, Al2O3 is larger than or equal to 3% and smaller than or equal to 4%, Fe2O3 is larger than or equal to 2% and smaller than or equal to 5%, Cr2O3 is larger than or equal to 1% and smaller than or equal to 10%, MnO is larger than or equal to 2% and smaller than or equal to 7%, C solid is larger than or equal to 3% and smaller than or equal to 5%, and the balance is impurities. CaO/SiO2 ranges from 1.2 to 1.4. By means of the covering slag, the peritectic steel surface thermal radiation absorption capacity is effectively improved, and finally the total casting blank surface crack occurrence rate is lowered.
Description
Technical field
The invention belongs to smelting iron and steel technical field, specifically refer to a kind of containing Cr
2o
3, MnO and Fe
2o
3deng the peritectic steel covering slag of Multimetal oxide.
Background technology
Peritectic steel refer to carbon content 0.08 ~ 0.18% a series of steel grades, during the casting of this steel series, crystallizer meniscus comes into being solidified shell with temperature decline generation δ-γ transformation, along with larger volume contraction, base shell and copper coin depart from and form air gap, cause the hot-fluid base shell that diminishes thinning, form depression on surface.Depressed area cooling and setting rate slower than other position, microstructure coarsening, strong to crack sensitivity, under thermal stress and ferrostatic pressure effect, concentrated and occur crackle at depression weakness generation stress.Suitable covering slag can play the effect reducing casting blank defect wherein.
The key of peritectic steel covering slag technology is the heat flow density of Control protection slag, and less heat flow density can slow down the generation of depression.Traditional peritectic steel covering slag has high alkalinity, dystectic feature, utilizes basicity high exactly, the feature that percent crystallization in massecuite increases, and reduces heat flow density.But along with the further increase of basicity, the heat flow density of peritectic steel covering slag does not reduce significantly.Therefore, need to study a kind of covering slag, the volume contraction that peritectic steel phase transformation limited proportionality is brought can be overcome, thus in peritectic steel casting cycle, reduce the strand lobe phenomenon that phase transformation causes.Metal oxide refers to that transition elements refers to a series of metallic elements in d district in the periodic table of elements, also known as metal.Comprising chromium, manganese, iron, cobalt, nickel, copper, zinc etc. is all metal.Content one timing of metal oxide in covering slag, can play the effect promoting peritectic steel covering slag crystallization.Promote that crystallization can improve the degree of crystallinity of covering slag slag film.For in covering slag, be generally divided into crystalline phase and glassy phase.J.W.Cho; T.Emi and H.Shibata.Heat Transfer across Mold Flux Film in Mold during InitialSolidification in Continuous Casting of Steel; ISIJ Int.; 1998; 38; 834-842 proposes heat transfer in covering slag and is divided into lattice conduction heat transfer and surface emissivity to conduct heat, and wherein degree of crystallinity is directly relevant to lattice conduction heat transfer, and larger degree of crystallinity can alleviate lattice conduction heat transfer.Xie.Related basic theory research and application practice ofcontinuous casting crystallizer Mold flux; Chongqing:DoctoralDissertation of Chongqing University; 2004; describe by adding single metal oxide in covering slag; covering slag degree of crystallinity can be significantly improved, alleviate the heat transfer of covering slag slag film.But Multimetal oxide mixing is added, there is no record at present.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of peritectic steel covering slag containing Multimetal oxide, utilizes this covering slag effectively can improve peritectic steel surface heat radiation absorbing capacity, the total cracking frequency of final reduction casting billet surface.
For achieving the above object; the invention provides a kind of peritectic steel covering slag containing Multimetal oxide; the chemical composition of corresponding steel grade is: C:0.08 ~ 0.22%; Si≤0.30%; S≤0.045%; P≤0.045%, is characterized in that: this covering slag chemical composition is by weight percentage: 30%≤CaO≤40%, 20%≤SiO
2≤ 30%, 6.5%≤F-≤7.5%, 10%≤Na
2o≤15%, 2%≤MgO≤3%, 3%≤Al
2o
3≤ 4%, 2%≤Fe
2o
3≤ 5%, 1%≤Cr
2o
3≤ 10%, 2%≤MnO≤7%, 3%≤C
gu≤ 5%, all the other components are impurity: described CaO/SiO
2be 1.2 ~ 1.4.
Further preferably, each chemical composition of this covering slag is by weight percentage: CaO is 39.2, SiO
2be 28%, Al
2o
3be 3.5%, F-be 7%, MgO be 2%, Cr
2o
3, MnO and Fe
2o
3assembly≤8% that three kinds of components are formed, Na
2o is 8%, C
gube 4%, all the other components are impurity.
Peritectic steel covering slag is generally divided into crystalline phase and glassy phase; content one timing of transition metal oxide in covering slag; the effect promoting peritectic steel covering slag crystallization can be played, promote that crystallization can improve the degree of crystallinity of covering slag slag film, also namely improve the crystalline phase ratio of covering slag.Research shows that in covering slag, heat transfer is divided into lattice conduction heat transfer and surface emissivity to conduct heat, and wherein degree of crystallinity is directly relevant to lattice conduction heat transfer, and larger degree of crystallinity can alleviate lattice conduction heat transfer.Peritectic steel covering slag containing Multimetal oxide of the present invention, by adding manganese oxide by a certain percentage in covering slag simultaneously, chromium oxide; iron oxide; slag membrane crystallization rate more than 10% can be significantly improved, reach and alleviate lattice conduction heat transfer, the total cracking frequency of final reduction casting billet surface.Facts have proved, the peritectic steel covering slag beneficial effect containing Multimetal oxide of the present invention is: (1) can reduce peritectic steel covering slag heat flow density, alleviates the volume contraction that in peritectic steel casting cycle, peritectoid phase transformation brings; (2) surface longitudinal crack occurred in peritectic steel casting cycle can be reduced.
Detailed description of the invention
Below in conjunction with specific embodiment, the peritectic steel covering slag containing Multimetal oxide of the present invention is described in further detail.
Embodiment
Choose three groups of peritectic steel covering slags containing Multimetal oxide, choose not containing Cr simultaneously
2o
3, MnO and Fe
2o
3the industrial peritectic steel covering slag of the existing the best in market do ratio 4; the chemical composition of corresponding casting steel grade is C:0.08 ~ 0.22%; Si≤0.30%; S≤0.045%; P≤0.045%, the covering slag of these three groups of different components and the main chemical compositions of comparative example are shown in Table 1 by weight percentage (all the other components are impurity).Wherein basicity computational methods are R=CaO/SiO
2.
Table 1
The raw material that the peritectic steel covering slag containing Multimetal oxide of above-mentioned three groups of embodiments uses is: manganese carbonate, manganese ore, bloodstone and analyze pure zirconia chromium or containing chromium mine tailing.Be not less than 40% containing in chromium mine tailing and manganese ore containing chromium and containing Mn oxide content, in bloodstone, iron oxide content is not less than 60%, and when manganese carbonate is raw material, the manganese oxide content of its conversion is not less than 40%; Above-mentioned raw materials is carried out Mechanical Crushing, requires that granularity is 30 ~ 300 microns; Then, after being mixed by raw material, add the pre-melted slag of 10 ~ 30%, adding bonding agent ratio is 2 ~ 15% of gross weight, after with the addition of bonding agent, uses mist projection granulating tower to carry out sample preparation.To guard against damp in transport and storage process, water absorption is greater than to the covering slag of 5%, forbid to use.
Choose three formulas according to ratio shown in table 1, preparation obtains the peritectic steel covering slag containing Multimetal oxide, and tests the physical quantity such as hemisphere point, burn-off rate, capacity, viscosity, heat flow density of these covering slags, and result is as shown in table 2.During test, each proportioning heat flow density value of heat flow density tests three times, then averages.Heat flow density is as an important performance parameter, and the heat that passes through of unit interval (1 second) in the cross section of its representation unit area (1 square metre), testing equipment uses the HF-200 slag film heat flux simulation instrument of University Of Chongqing's exploitation.
Table 2, the physical property detected value of each embodiment and comparative example covering slag
Test the composition scene of wherein embodiment 3 covering slag, field trial steel grade is Q235, and this Q235 basic technological parameters is as shown in table 3.Wherein Q235 typical case pulling rate is for shown in table 3:
Table 3
The on-the-spot crystallizer heat flow density change of novel protected slag is as shown in table 4.
Table 4
Upper as can be seen from table, utilize covering slag post crystallization device heat flow density of the present invention to stablize, slag film thickness is suitable, is applicable to onsite application completely.
Shown by above-described embodiment, the present invention is simultaneously containing Cr
2o
3, MnO and Fe
2o
3deng the hemisphere of the peritectic steel covering slag of Multimetal oxide o'clock at 1040 ~ 1180 DEG C, burn-off rate is 12 ~ 28s, and heat flow density is 0.54 ~ 0.78Mwm
-2, unit weight is 0.6 ~ 0.8gcm
-3, viscosity is 0.12 ~ 0.20Pa.s, has excellent comprehensive physical performance.
Claims (2)
1., containing a peritectic steel covering slag for Multimetal oxide, the chemical composition of corresponding steel grade is: C:0.08 ~ 0.22%, Si≤0.30%; S≤0.045%; P≤0.045%, is characterized in that: this covering slag chemical composition is by weight percentage: 30%≤CaO≤40%, 20%≤SiO
2≤ 30%, 6.5%≤F
-≤ 7.5%, 8%≤Na
2o≤15%, 2%≤MgO≤3%, 3%≤Al
2o
3≤ 4%, 2%≤Fe
2o
3≤ 5%, 1%≤Cr
2o
3≤ 10%, 2%≤MnO≤7%, 3%≤C
gu≤ 5%, all the other components are impurity, wherein, and described CaO/SiO
2be 1.2 ~ 1.4.
2. the peritectic steel covering slag containing Multimetal oxide according to claim 1, is characterized in that: this covering slag chemical composition is by weight percentage: CaO is 39.2, SiO
2be 28%, Al
2o
3be 3.5%, F
-be 7%, MgO be 2%, Cr
2o
3, MnO and Fe
2o
3assembly≤8% that three kinds of components are formed, Na
2o is 8%, C
gube 4%, all the other components are impurity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410637088.8A CN104368778A (en) | 2014-11-13 | 2014-11-13 | Peritectic steel covering slag containing multiple metal oxides |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410637088.8A CN104368778A (en) | 2014-11-13 | 2014-11-13 | Peritectic steel covering slag containing multiple metal oxides |
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|---|---|
| CN104368778A true CN104368778A (en) | 2015-02-25 |
Family
ID=52548119
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|---|---|---|---|
| CN201410637088.8A Pending CN104368778A (en) | 2014-11-13 | 2014-11-13 | Peritectic steel covering slag containing multiple metal oxides |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107584090A (en) * | 2017-09-07 | 2018-01-16 | 中南大学 | A kind of medium carbon steel Mold Powder Without Fluorine for adding Composite Nucleation Agents |
| CN107671250A (en) * | 2017-08-29 | 2018-02-09 | 东北大学 | A kind of ocean platform medium managese steel continuous casting covering slag |
| CN112355261A (en) * | 2020-10-26 | 2021-02-12 | 中天钢铁集团有限公司 | Crystallizer casting powder suitable for producing peritectic steel through efficient continuous casting |
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2014
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107671250A (en) * | 2017-08-29 | 2018-02-09 | 东北大学 | A kind of ocean platform medium managese steel continuous casting covering slag |
| CN107584090A (en) * | 2017-09-07 | 2018-01-16 | 中南大学 | A kind of medium carbon steel Mold Powder Without Fluorine for adding Composite Nucleation Agents |
| CN107584090B (en) * | 2017-09-07 | 2019-07-26 | 中南大学 | A kind of medium carbon steel Mold Powder Without Fluorine adding Composite Nucleation Agents |
| CN112355261A (en) * | 2020-10-26 | 2021-02-12 | 中天钢铁集团有限公司 | Crystallizer casting powder suitable for producing peritectic steel through efficient continuous casting |
| CN112355261B (en) * | 2020-10-26 | 2022-06-28 | 中天钢铁集团有限公司 | Crystallizer casting powder suitable for producing peritectic steel through efficient continuous casting |
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Application publication date: 20150225 |