CN1405332A - Molten steel scavenger - Google Patents
Molten steel scavenger Download PDFInfo
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- CN1405332A CN1405332A CN 02146152 CN02146152A CN1405332A CN 1405332 A CN1405332 A CN 1405332A CN 02146152 CN02146152 CN 02146152 CN 02146152 A CN02146152 A CN 02146152A CN 1405332 A CN1405332 A CN 1405332A
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- molten steel
- purification
- agent
- slag
- cao
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention mainly refers to steel melt purifying. The purificant components (wt%): CaO 45-76%, Al2O3 10-30%, the sum of one or more than two among Al, Ca, Si and Ba is 5-18%; SiO2 <=80%, P<=0.05%, S<=0.1%. Produce the purificant adopting smelting by electrical cinder furnace. The smelting temperature is 1600-1800 deg.C.
Description
Technical field
The invention belongs to the liquid steel refining process field, relate generally to purification of molten steel, promptly add treatment agent and remove in the molten steel and be mingled with.
Technical background
Along with science and technology development, all trades and professions are also more and more higher to the requirement of using steel product quality.Therefore, adopt various effective refining techniquess,, further improve the every index of molten steel cleanliness factor, become the focus that the metallurgical technicians pays close attention to improve the quality of molten steel.In numerous liquid steel refining technology, the purification of molten steel agent is easy to use, application cost is cheap, effect is remarkable and stable and receive much attention.
In the prior art, refining slag system more typical and commonly used is the calcium aluminate slag system.This slag system has that fusing point is low, sulfur capacity is big, the advantage of inclusion high adsorption capacity.But in China's STEELMAKING PRODUCTION, all exist molten steel oxygen activity height, slag oxidisability strong and go out problem such as steel band slag to some extent, the ability of this deoxidation to conventional calcium aluminate slag system, desulfurization and dross inclusion adsorption is all brought very big negative impact, particularly be with hyperoxia voltinism slag, negative impact is bigger, and then show as conventional aluminium calcium slag be refining slag can not deoxidation, desulfurization, the dross inclusion adsorption weak effect.
Summary of the invention
The object of the present invention is to provide a kind of effectively purify hot metal, significantly improve the purification of molten steel agent of steel quality, even this scavenging agent strong at molten steel oxidation height, slag oxidisability, go out under the situation of steel band slag, also can obtain the effect of good deoxidation, desulfurization, absorption steel inclusion.
At above-mentioned purpose, the chemical ingredients of purification of molten steel agent of the present invention (Wt%) is: CaO 45-75%, Al
2O
310-30%, any or any two above sum is 5-18% among metal A l, Ca, Si, the Ba, SiO2≤8%, P≤0.05%, S≤0.1%.
In the mentioned component, CaO is the basal component of desulfurization, and when the basicity of ladle band slag was high, the CaO content in the scavenging agent took off limit, on the contrary capping, so that will satisfy the requirement of molten steel desulfurizing through the cinder inclusion basicity of adjusting.Al in the chemical ingredients
2O
3Be mainly used in fusing point and the viscosity of adjusting the purification of molten steel agent, to satisfy in the liquid steel refining process requirement to the flowability of refining slag.Metal A l in this scavenging agent, Ca, Si, Ba play a part reductor, promptly remove the oxygen in the molten steel, and remove tapping and bring oxygen in the slag in the ladle into, exceed the metal that limits metal content in the purification of molten steel agent of the present invention and then play a part alloying agents.
The production method of purification of molten steel agent of the present invention adopts the electroslag furnace melting method.
At first prepare burden by its chemical ingredients scope.During batching, the CaO raw material can adopt the lime that contains CaO＞90%, Al
2O
3Raw material can adopt and contain Al
2O
3＞70% aluminium vanadine, Al, Ca, Si, Ba can corresponding employing metal A l, Ca-Si, SiFe, BaFe, SiCaBa; The raw material crushing that above-mentioned outfit is good becomes the particle below the 10mm, and mixes, and after the mixing compound is directly added in the electroslag furnace energising melting, smelting temperature 1600-1800 ℃.Slag after the melting through cooling, be broken into suitable granularity, purification of molten steel agent of the present invention.
Compared with prior art, the present invention has following advantage:
1. deoxidation, sweetening effectiveness are good, and the inclusion in the slag is had stronger adsorptive power.
2. applied widely, effect is stable.
3. cost of material is low, the source is wide, total cost is low.
4. production unit is simple, less investment.
Description of drawings
Accompanying drawing 1 is the purification of molten steel agent and the sweetening effectiveness graphic representation of Comparative Examples when liquid steel refining of embodiment lot number 1 among the present invention.
Abscissa is the time phase of test among Fig. 1, respectively behind smelting endpoint, stove before the Argon, take a sample the chemical examination sulphur content behind LF stokehold and the LF stove.Curve 1 is a present embodiment lot number 1 among the figure, and curve 2 is a Comparative Examples.
Embodiment
According to chemical ingredients scope of the present invention, three batches of purification of molten steel agent have been prepared.
At first prepare burden, wherein the CaO raw material can adopt the lime that contains CaO＞90%, Al
2O
3Raw material can adopt and contain Al
2O
3＞70% aluminium vanadine, Al, Ca, Si, Ba can corresponding employing metal A l, Ca-Si, SiFe, BaFe, SiCaBa; The raw material crushing that above-mentioned outfit is good becomes the particle below the 10mm, after mixing, directly adds in the electroslag furnace, and the energising melting, the slag after the melting promptly becomes purification of molten steel agent of the present invention through cooling off, being broken into suitable granularity.(Wt%) is as described in Table 1 for the chemical ingredients of three batches of purification of molten steel agent, and the energising slag temperature of compound in electroslag furnace is as shown in table 2.
Adopt the purification of molten steel agent of lot number 1 among the embodiment, in the 80t ladle, the 08Al steel of smelting is carried out refining.The refinery practice flow process is:
Converter smelting endpoint → in ladle, add purification of molten steel agent 200kg → tapping, after cancellation reductor → tapping finishes, Argon stirring → LF stove processing → continuous casting after adding purification of molten steel agent 200Kg → stove on the ladle face
In order to contrast, carry out conventional liquid steel refining to the 08Al steel same period in the 80t ladle, adopts the calcium aluminate scavenging agent, and its process is as follows:
Converter smelting endpoint → tapping adds ALFe or after the deoxidation of SiFe alloy → tapping finished, Argon stirring → LF stove added calcium aluminate scavenging agent 500kg → continuous casting after adding insulating covering agent 120Kg → stove on the ladle face
The molten steel treatment effect of embodiment lot number 1 and Comparative Examples is as shown in table 3.
From table 3 and accompanying drawing 1 as seen, the present invention is much better than Comparative Examples to the decontamination effect improving of molten steel.
The chemical ingredients (Wt%) of table 1 embodiment purification of molten steel agent
| Lot number | Chemical ingredients | ||||||||
| ??CaO | ?Al 2O 3 | ???Al | ???Ca | ???Si | ???Ba | ??SiO 2 | ????P | ????S | |
| ?1 | ?73.91 | ??14.18 | ??5.22 | ??6.61 | ??0.030 | ??0.050 | |||
| ?2 | ?54.85 | ??29.89 | ??9.13 | ??6.056 | ??0.036 | ??0.038 | |||
| ?3 | ?61.79 | ??20.1 | ??3.91 | ??4.10 | ??5.12 | ??4.92 | ??0.031 | ??0.029 | |
The temperature of fusion of table 2 embodiment purification of molten steel agent compound in electroslag furnace (℃)
| Lot number | ????1 | ????2 | ????3 |
| The electroslag temperature of fusion | ???1780 | ???1620 | ???1690 |
Table 3 embodiment and Comparative Examples purification of molten steel effect
| Project | Comparative Examples | Embodiment 1 |
| 1. ladle is mingled with total amount, ppm before the refining | ????300.7 | ????180.3 |
| Wherein, Al 2O 3Be mingled with ppm | ????200.5 | ????129.8 |
| CaO is mingled with, ppm | ????4.0 | ????1.8 |
| 2. the middle double team total amount of mixing, ppm | ????100.2 | ????47.8 |
| Wherein, Al 2O 3Be mingled with ppm | ????62.5 | ????28.7 |
| CaO is mingled with, ppm | ????2.1 | ????0.5 |
| 3. strand T[O], ppm | ????38.6 | ????14.3 |
Claims (2)
1. purification of molten steel agent is characterized in that its chemical ingredients (Wt%) is: CaO 45-75%, Al
2O
310-30%, any or any two above sum is 5-18% among metal A l, Ca, Si, the Ba.
2. purification of molten steel agent according to claim 1 is characterized in that also containing in the chemical ingredients (Wt%) SiO2≤8%, P≤0.05%, S≤0.1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02146152 CN1405332A (en) | 2002-11-01 | 2002-11-01 | Molten steel scavenger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02146152 CN1405332A (en) | 2002-11-01 | 2002-11-01 | Molten steel scavenger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1405332A true CN1405332A (en) | 2003-03-26 |
Family
ID=4751016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02146152 Pending CN1405332A (en) | 2002-11-01 | 2002-11-01 | Molten steel scavenger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1405332A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101451174B (en) * | 2007-11-30 | 2010-11-03 | 大石桥市和兴耐火材料厂 | Deslagging process of unrefined steel |
| CN102312049A (en) * | 2010-06-29 | 2012-01-11 | 鞍钢股份有限公司 | Desulfurizing agent suitable for high-aluminum silicon steel and preparation method thereof |
| CN102876846A (en) * | 2012-06-28 | 2013-01-16 | 辽宁中汇环保科技有限公司 | Method for producing low sulfur steel through applying pre-melting calcium aluminate to refine in argon station |
| CN102965472A (en) * | 2012-11-27 | 2013-03-13 | 魏书林 | Cast steel purifying agent and production method thereof |
| CN103205535A (en) * | 2013-04-11 | 2013-07-17 | 内蒙古包钢钢联股份有限公司 | Method for controlling silicon return for steel with lower silicon content |
| CN103276154A (en) * | 2013-06-09 | 2013-09-04 | 河冶科技股份有限公司 | Preparation method, secondary refining method and refining agent of PMHSS (powder metallurgy high speed steel) |
| CN103642989A (en) * | 2013-11-21 | 2014-03-19 | 青岛佰众化工技术有限公司 | Steel liquid purification agent |
-
2002
- 2002-11-01 CN CN 02146152 patent/CN1405332A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101451174B (en) * | 2007-11-30 | 2010-11-03 | 大石桥市和兴耐火材料厂 | Deslagging process of unrefined steel |
| CN102312049A (en) * | 2010-06-29 | 2012-01-11 | 鞍钢股份有限公司 | Desulfurizing agent suitable for high-aluminum silicon steel and preparation method thereof |
| CN102312049B (en) * | 2010-06-29 | 2014-04-02 | 鞍钢股份有限公司 | Desulfurizing agent suitable for high-aluminum silicon steel and preparation method thereof |
| CN102876846A (en) * | 2012-06-28 | 2013-01-16 | 辽宁中汇环保科技有限公司 | Method for producing low sulfur steel through applying pre-melting calcium aluminate to refine in argon station |
| CN102965472A (en) * | 2012-11-27 | 2013-03-13 | 魏书林 | Cast steel purifying agent and production method thereof |
| CN102965472B (en) * | 2012-11-27 | 2014-01-15 | 魏书林 | Cast steel purifying agent and production method thereof |
| CN103205535A (en) * | 2013-04-11 | 2013-07-17 | 内蒙古包钢钢联股份有限公司 | Method for controlling silicon return for steel with lower silicon content |
| CN103276154A (en) * | 2013-06-09 | 2013-09-04 | 河冶科技股份有限公司 | Preparation method, secondary refining method and refining agent of PMHSS (powder metallurgy high speed steel) |
| CN103276154B (en) * | 2013-06-09 | 2015-08-05 | 河冶科技股份有限公司 | The preparation method of p/m high speed steel, secondary refining method and refining agent |
| CN103642989A (en) * | 2013-11-21 | 2014-03-19 | 青岛佰众化工技术有限公司 | Steel liquid purification agent |
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