CN100545268C - Multifunctional composite refining agent for steel-smelting - Google Patents

Multifunctional composite refining agent for steel-smelting Download PDF

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Publication number
CN100545268C
CN100545268C CNB2006100222479A CN200610022247A CN100545268C CN 100545268 C CN100545268 C CN 100545268C CN B2006100222479 A CNB2006100222479 A CN B2006100222479A CN 200610022247 A CN200610022247 A CN 200610022247A CN 100545268 C CN100545268 C CN 100545268C
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China
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steel
cao
bacasi
refining agent
cac
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Expired - Fee Related
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CNB2006100222479A
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CN101177721A (en
Inventor
曾建华
李桂军
陈永
杨素波
黎光正
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Pangang Group Steel Vanadium and Titanium Co Ltd
Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Panzhihua New Steel and Vanadium Co Ltd
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Priority to CNB2006100222479A priority Critical patent/CN100545268C/en
Publication of CN101177721A publication Critical patent/CN101177721A/en
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Publication of CN100545268C publication Critical patent/CN100545268C/en
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Abstract

The present invention proposes a kind of multi-functional refining agent that can effectively control steel inclusion, this refining agent is by CaO, CaC 2, SiC, Na 2CO 3, C, CaF 2With the BaCaSi alloy composition, its weight percent is CaO:30~60%, CaC 2: 5~15%, SiC:5~15%, Na 2CO 3: 5~15%, CaCO 3: 5~15%, CaF 2: 5~15%, BaCaSi:2~10%, C:2~10%, fusing point≤1400 ℃.This refining agent has removes the function that is mingled with in the steel, also has the function of foaming submerged arc, desulfurization.After being used this composite refiner, can make the T[O in the finished steel] drop to 5 * 10 -6~15 * 10 -6Scope in, B, C, D class are mingled with grading and are not more than 1.0 grades, have the good S effect of taking off simultaneously.

Description

Multifunctional composite refining agent for steel-smelting
Technical field
The present invention relates to a kind of steel-making refining agent, belong to the molten steel furnace external refining field, when particularly converter process is smelted the high quality molten steel molten steel is carried out refining.
Background technology
Oxygen blast operation meeting during because of converter steelmaking in the stove makes the Fe in the molten steel be oxidized to FeO in a large number, thereby cause the FeO in the converter slag to increase considerably, and can bring a large amount of converter slags inevitably in ladle during converter tapping, the FeO of ladle slag is in the higher scope.The ladle slag of high FeO content has the ability that passes oxygen once more to ladle molten steel, increases the total oxygen demand of molten steel, worsens the quality of molten steel.Owing in the deoxidation alloying of medium and high carbon steel, often will use a large amount of SiFe, SiMn etc. to contain the Si alloy, generate deoxidation products SiO simultaneously 2Come-up can reduce ladle slag basicity after entering ladle slag, influences the receptivity of ladle slag to steel inclusion.Therefore, the LF furnace outer refining technology is the key link that converter process is produced high-quality steel, utilizes the refining agent elimination or reduce the oxygen delivery capacity of ladle slag to molten steel in this link, simultaneously according to being mingled with the control requirement with CaO, SiO in the ladle slag 2, Al 2O 3, MgO is controlled at certain scope, improves the foaming power of refining agent at the LF refining process, regulates LF refining furnace atmosphere, is the core technology that converter+LF technology is smelted the high quality molten steel.
" steel-making " magazine in February, 2004 (the 30th~32 page of the 20th the 1st phase of volume, the application of quickened lime in liquid steel refining, works such as Yu Huacai) has reported that this steel adopts adding quickened lime and fluorite that converter molten steel is carried out purified technology.This technology is after 120 tons of converter smelting molten steel tappings, the fluorite that adds 100~150kg quickened lime and quickened lime amount 10%~30% in ladle carries out ladle refining, can improve refining agent basicity, reduce the fusing point of slag, change mobile, to molten steel desulfurizing with improve ladle slag and remove and be mingled with ability and have certain effect.This technology does not possess the slag frothing function, and can not eliminate the oxidisability of bringing converter slag in the ladle into, has only improved the basicity of ladle slag, and certain S effect of taking off is arranged, and can't realize the Comprehensive Control that is mingled with and avoid the secondary oxidation problem of molten steel in the refining process.
" Baogang's science and technology " magazine in April, 2004 (the 38th~41 page of the 30th the 2nd phase of volume, the application of synthetic slag during tapping on converter, works such as Sun Ligang) has reported that Baogang's employing adds CaO:47.20%~47.30%, SiO in ladle 2: Al 2.86%~3.01%, 2O 3: CaF 42.60%~42.80%, 2: Fe 4.06%~4.26%, 2O 3: MgO:0.68%~0.72% 0.76%~0.82%,, the synthetic slag that fusing point is 1450 ± 50 ℃ carries out purified technology to converter molten steel, and this technology can reach 9.1%~34.1% desulfurization degree.This process using special-purpose synthetic slag, and sweetening effectiveness is obvious, but does not possess frothing function equally, does not also see the report that is mingled with control.
" steel-making " magazine in August, 2004 (the 15th~17 page of the 20th the 4th phase of volume, the process practice of heavy steel steelworks LF, works such as Hu Bing) has reported that heavy steel adopts LF stove white slag Process that converter molten steel is carried out purified technology.This technology is at first controlled CaO-Al in ladle 2O 3-SiO 2The basicity of slag system adds submerged arc slag 2~3kg and refining agent 4~7kg by steel per ton then 3.5~4.2, can form the strong reducing slag (being white slag) of FeO≤1.0.This article has been reported another kind of technology simultaneously, and it is that Al:25%, C:36%, active element R are refining composite deoxidization reducer 0.8~1kg of 39% that steel promptly per ton adds chemical composition, replaces refining agent.Though this technology has reduced the FeO in the ladle slag, making simultaneously that S content has reached 0.005%~0.0012% (average 0.009%), T[O in the Finished Steel] content reaches 15 * 10 -6~34 * 10 -6(average 24 * 10 -6) level, but need submerged arc slag and refining agent to be used when producing, very inconvenience of production operation and management, and T[O] content still has bigger gap with the requirement of high quality molten steel, do not see to be mingled with control report.
In a word, the refining agent function is more single at present, is difficult to the bigger effect of performance in the production of high-quality steel.
Summary of the invention
The object of the present invention is to provide a kind of fusing point low, slagging is fast, has good reducing power and omnidistance foaming power, and can regulate refining furnace atmosphere and the multifunctional composite refining agent of realizing being mingled with Comprehensive Control.
Steel-making provided by the invention uses composite refiner by CaO, CaC 2, SiC, Na 2CO 3, CaCO 3, C, CaF 2With the BaCaSi alloy be that raw material forms through physical mixed, their weight percent is:
CaO:30~60%, CaC 2: 5~15%, SiC:5~15%, Na 2CO 3: 5~15%, CaCO 3: 5~15%, C:2~10%, CaF 2: 5~15%, BaCaSi or SiCa:2~10%.
Further, CaC 2+ SiC+C+BaCaSi is 10~50%, CaCO 3+ CaC 2+ SiC+Na 2CO 3Be 10~40%.Wherein, CaC 2+ SiC+C+BaCaSi is 10~50%, has good restoring function to guarantee refining agent; CaCO 3+ CaC 2+ SiC+Na 2CO 3Be 10~40%, to guarantee that refining agent has good frothing function in refining process.
Wherein, CaC 2By calcium carbide with addition of, Na 2CO 3By calcined soda for industry with addition of; CaCO 3By rhombspar, Wingdale or calcite with addition of; CaF 2By fluorite with addition of, CaO by quickened lime or lime kilning with addition of; BaCaSi by the BaCaSi alloy with addition of, C by graphite, charcoal, carbon dust or carburelant with addition of.
Above-mentioned steel-making ∑ CaO/ ∑ SiO in the refining agent component 2Be 2.0~7.0, wherein ∑ CaO is the CaO that brings into of quickened lime and calcium carbide, CaCO 3, the CaO that generates of fluorite decomposition reaction total amount, ∑ SiO 2SiO for Si reaction generation among SiC and the BaCaSi 2Total amount.∑ CaO/ ∑ SiO 2Be controlled at 2.0~7.0th, for the ladle slag basicity after refining is finished is controlled at (2~7) in the suitable scope, low excessively (the ∑ CaO/ ∑ SiO of basicity 2Less than 2.0) ladle slag absorption is mingled with a little less than the ability too high (∑ CaO/ ∑ SiO 2Greater than 7.0) refining agent fusing difficulty, not only to be mingled with ability low in absorption, and it is higher to cause in the steel D class to be mingled with rank.
Wherein, Al in the refining agent 2O 3Answer≤5.0%, because Al 2O 3Height will reduce Al in the steel 2O 3The adsorptive power that class is mingled with may occur because of Al for the strict steel grade of Als simultaneously 2O 3Reduction causes the phenomenon that Als requires above control in the steel.
The preparation method of refining agent of the present invention: used various raw materials are crushed to 2~8mm respectively, take by weighing each raw material weight according to proportioning, the raw material that weighs up is put into the dry type mixing and blending machine, mix 20~30min after, the liner of the 20kg/ that packs into bag is the double braid bag of plastics film.In transportation with deposit in the process should moistureproof, fire prevention.
Above-mentioned steel-making with composite refiner adding method is: add refining agent 2~4kg/t steel in the converter tapping process in ladle, add refining agent 1~5kg/t steel in the LF stove refining process in ladle.
Use the present invention's steel-making to have following advantage with refining agent:
1. go into the converter quantity of slag 〉=5kg, FeO 20%~30% the time when steel band per ton, adopt the technology of the present invention after, FeO in the ladle slag is dropped to below 1.5% (see Table 2); T[O in the finished steel] can drop to 5 * 10 -6~15 * 10 -6Scope in (seeing Table 3); B, C, D class are mingled with grading and are not more than 1.0 grades (seeing Table 4).
2. after adopting the technology of the present invention, the desulfurization degree of LF refining process is brought up to 50~90% (seeing Table 8) by 10~30%, and by regulating the add-on may command desulfurization degree of refining agent, can satisfy the refining demand that high-quality, the high S of part contains dimension.
3. composite refiner is the physical mixture of various materials, does not need premelt before the use, and cost is low.
4. this composite refiner contains a large amount of foaming substances, can realize omnidistance foaming in refining process, therefore when the electrically heated refining, need not add whipping agent, not only can reduce production costs, and simplifies the operation and manages, and also can avoid the secondary oxidation of molten steel.
5. the carbon dust of allocating among the present invention can be with the weak oxide gas CO of foaming substance generation 2Be reduced to reducing gas CO, help avoiding the molten steel secondary oxidation.
The embodiment of form is described in further detail foregoing of the present invention again by the following examples.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following example, all technology that realizes based on foregoing of the present invention all belong to scope of the present invention.
Embodiment
The preparation of embodiment 1 refining agent of the present invention
Raw material: (by weight percentage)
CaO:30%,CaC 2:5%,SiC:10%,Na 2CO 3:5%,CaCO 3:15%,C:10%,CaF 2:15%,BaCaSi:10%。
The preparation method: used various raw materials are crushed to 2~8mm respectively, take by weighing each raw material weight, the raw material that weighs up is put into the dry type mixing and blending machine according to proportioning, mix 20~30min after, the liner of the 20kg/ that packs into bag is the double braid bag of plastics film.In transportation with deposit in the process should moistureproof, fire prevention.
The above-mentioned steel-making ∑ CaO/ ∑ SiO of composite refiner 2Be 3.5, fusing point is 1390 ℃.
Above-mentioned steel-making with composite refiner adding method is: add refining agent 2~4kg/t steel in the converter tapping process in ladle, add refining agent 1~5kg/t steel in the LF stove refining process in ladle.
The preparation of embodiment 2 refining agents of the present invention
Raw material: (by weight percentage)
CaO:40%,CaC 2:10%,SiC:10%,Na 2CO 3:10%,CaCO 3:8%,C:5%,CaF 2:15%,BaCaSi:2%。
The preparation method is with embodiment 1.
The above-mentioned steel-making ∑ CaO/ ∑ SiO of composite refiner 2Be 4.0, fusing point is 1360 ℃.
Above-mentioned steel-making with composite refiner adding method is: add refining agent 2~4kg/t steel in the converter tapping process in ladle, add refining agent 1~5kg/t steel in the LF stove refining process in ladle.
The preparation of embodiment 3 refining agents of the present invention
Raw material: (by weight percentage)
CaO:52%,CaC 2:5%,SiC:8%,Na 2CO 3:12%,CaCO 3:5%,C:5%,CaF 2:9%,BaCaSi:4%。
The preparation method is with embodiment 1.
The above-mentioned steel-making ∑ CaO/ ∑ SiO of composite refiner 2Be 5.5, fusing point is 1370 ℃.
Above-mentioned steel-making with composite refiner adding method is: add refining agent 2~4kg/t steel in the converter tapping process in ladle, add refining agent 1~5kg/t steel in the LF stove refining process in ladle.
The preparation of embodiment 4 refining agents of the present invention
A kind of steel-making composite refiner is characterized in that comprising that following component forms by weight ratio:
CaO:58%,CaC 2:5%,SiC:15%,Na 2CO 3:5%,CaCO 3:5%,C:4%,CaF 2:5%,CaSi:3%。
The preparation method is with embodiment 1.
The above-mentioned steel-making ∑ CaO/ ∑ SiO of composite refiner 2Be 2.8, fusing point is 1400 ℃.
Above-mentioned steel-making with composite refiner adding method is: add refining agent 2~4kg/t steel in the converter tapping process in ladle, add refining agent 1~5kg/t steel in the LF stove refining process in ladle.
The application of test example 1 refining agent of the present invention
Certain converter steelmaking factory adopts the low C method that increases (the actual C to 0.05% of drawing) of drawing, and adopts the technology of the present invention to control when producing heavy rail by table 1 chemical composition and is mingled with.Employed refining agent is by embodiment 2 preparations.
Table 1
Table 2 is synopsis of ladle slag chemical composition after preceding ladle slag (mainly being made up of converter slag) chemical composition of refining and the refining of employing the technology of the present invention.Table 2 shows that slag of the present invention has good reducing power, the FeO of ladle slag≤1.0% after the refining.
Table 2
Table 3 is when adopting the technology of the present invention production Properties of Heavy Rail Steel By, T[O in the Finished Steel] situation.Table 3 shows that the present invention has the good receptivity that is mingled with, and can realize the stably manufactured of high-quality steel.
Table 3
Table 4 is when adopting the technology of the present invention production Properties of Heavy Rail Steel By, the grading situation of finished product A, B, C, D non-metallic inclusion.Table 4 shows that the present invention can effectively control in the steel and is mingled with.
Table 4
Table 5 is the LF refining time of use refining agent of the present invention and the contrast of former technology, and table 5 shows, because refining agent fusing point of the present invention low (former technology is 1480 ℃ with the refining agent fusing point), slagging is fast, so refining time on average shortens 15.6min.
The contrast of table 5 refining time
Project Use refining agent of the present invention Former technology
Scope 15~35min 30~50min
On average 29.6min 45.2min
The application of test example 2 refining agents of the present invention
Certain converter steelmaking factory adopts the technology of the present invention to control and controls in the steel to be mingled with and sulphur content for medium carbon steel steel qualities such as raising square billet 45#, and employed refining agent is by embodiment 4 preparations.
Table 6 is when adopting the technology of the present invention to produce, T[O in the Finished Steel] situation.Table 6 shows that the present invention has the good receptivity that is mingled with, and can realize the stably manufactured of high-quality steel.
Table 6
Table 7 is when adopting the technology of the present invention to produce, the grading situation of finished product A, B, C, D non-metallic inclusion.Table 7 shows that the present invention can effectively control in the steel and is mingled with.
Table 7
The changing conditions of [S] in steel when table 8 is the production of employing the technology of the present invention.Table 7 shows that slag of the present invention has good sweetening power, utilizes the present invention under the condition of converter terminal [S]≤0.012%, can carry out the low-sulfur steel production of [S]≤0.005%.
Table 8 refining agent desulfurization situation
In a word, refining agent fusing point of the present invention is low, and slagging is fast, has good reducing power and omnidistance foaming power, and can regulate the refining furnace atmosphere and realize being mingled with Comprehensive Control, be adapted to the multifunctional composite refining agent that the converter process fast pace is produced the high quality molten steel fully.After adopting this refining agent, not only can make the T[O in the Finished Steel] content reaches 15 * 10 -6Below extremely low level, and be effectively controlled all kinds of being mingled with, desulfurization degree reaches 50~90% simultaneously.For steel-making provides a kind of Multifunction composite refiner.

Claims (3)

1, a kind of steel-making composite refiner, it is by CaO, CaC 2, SiC, Na 2CO 3, CaCO 3, C, CaF 2With the BaCaSi alloy be that raw material forms through physical mixed, their weight percent is:
CaO:30~60%,CaC 2:5~15%,SiC:5~15%,Na 2CO 3:5~15%,CaCO 3:5~15%,C:2~10%,CaF 2:5~15%,BaCaSi:2~10%;
Wherein, CaC 2+ SiC+C+BaCaSi is 10~50%, CaCO 3+ CaC 2+ SiC+Na 2CO 3Be 10~40%;
∑ CaO/ ∑ SiO in the refining agent component 2Be 2.0~7.0, wherein ∑ CaO is the CaO that brings into of quickened lime and calcium carbide, CaCO 3, the CaO that generates of fluorite decomposition reaction total amount, ∑ SiO 2SiO for Si reaction generation among SiC and the BaCaSi 2Total amount.
2, steel-making composite refiner according to claim 1 is characterized in that: CaC 2By calcium carbide with addition of, Na 2CO 3By calcined soda for industry with addition of; CaCO 3By rhombspar, Wingdale or calcite with addition of; CaF 2By fluorite with addition of, CaO by quickened lime or lime kilning with addition of; BaCaSi by the BaCaSi alloy with addition of, C by graphite, charcoal, carbon dust or carburelant with addition of.
3, the described steel-making of claim 2 preparation method of composite refiner may further comprise the steps:
Take by weighing each raw material weight according to proportioning, be crushed to 2~8mm respectively, put into the dry type mixing and blending machine, mix 20~30min promptly.
CNB2006100222479A 2006-11-10 2006-11-10 Multifunctional composite refining agent for steel-smelting Expired - Fee Related CN100545268C (en)

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