CN111471827A - Method for controlling titanium content in smelted silicon steel to be less than or equal to 15ppm - Google Patents
Method for controlling titanium content in smelted silicon steel to be less than or equal to 15ppm Download PDFInfo
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- 239000010936 titanium Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 43
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 35
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 27
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 87
- 239000010959 steel Substances 0.000 claims abstract description 87
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 81
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000000654 additive Substances 0.000 claims abstract description 30
- 230000000996 additive effect Effects 0.000 claims abstract description 27
- 238000010079 rubber tapping Methods 0.000 claims abstract description 24
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 21
- 238000005275 alloying Methods 0.000 claims abstract description 19
- 238000003723 Smelting Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 12
- 238000009489 vacuum treatment Methods 0.000 claims abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 22
- 239000001301 oxygen Substances 0.000 claims description 22
- 229910001570 bauxite Inorganic materials 0.000 claims description 15
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 12
- 239000004411 aluminium Substances 0.000 claims description 12
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 3
- 238000012805 post-processing Methods 0.000 claims description 3
- 239000000956 alloy Substances 0.000 abstract description 10
- 229910045601 alloy Inorganic materials 0.000 abstract description 10
- 239000002893 slag Substances 0.000 description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- 229910052681 coesite Inorganic materials 0.000 description 9
- 229910052906 cristobalite Inorganic materials 0.000 description 9
- 229910052682 stishovite Inorganic materials 0.000 description 9
- 229910052905 tridymite Inorganic materials 0.000 description 9
- 239000000377 silicon dioxide Substances 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 4
- 229910052593 corundum Inorganic materials 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The application belongs to the technical field of steel smelting, and particularly relates to a method for controlling the content of titanium in smelted silicon steel to be less than or equal to 15ppm, which comprises the following steps: alloying in the tapping process, and adding an aluminum-containing additive during alloying to ensure that the aluminum content in molten steel is not more than 0.005 percent; adding ferrosilicon; carrying out vacuum treatment and post-procedures; solves the problem that the Ti content in molten steel is increased and the purity of the molten steel is influenced because Ti is added in the alloy in the prior silicon steel smelting process.
Description
Technical Field
The application belongs to the technical field of silicon steel smelting, and particularly relates to a method for controlling the titanium content in the smelted silicon steel to be less than or equal to 15 ppm.
Background
The silicon steel has excellent magnetic properties, can be used for manufacturing iron cores of motors and transformers in power systems, and provides high magnetic flux for the transformers through excellent soft magnetic characteristics and magnetization properties, so that a high-efficiency electric-magnetic-electric conversion function is realized, and high-efficiency electromagnetic conversion is realized.
Ti in silicon steel smelting water is generally required to be less than or equal to 0.003 percent because Ti forms TiN which is more stable than BN and AlN and is not suitable for being used as an inhibitor. During hot rolling and normalization, TiN may form coarse composite precipitates as AlN and MnS precipitate cores. TiS also causes uneven N penetration and imperfect secondary recrystallization.
Oxide inclusions in the steel affect the magnetic domain structure and magnetization behavior on the one hand and may prevent secondary recrystallization grain growth on the other hand, thereby reducing the oxide inclusion content in the steel as much as possible, and an important means for reducing the oxide inclusion content is to control the proper steel oxygen content and steel slag composition. After the molten steel is subjected to RH refining, oxide inclusions larger than 5mm are basically removed, and oxide inclusions smaller than 5mm are not easy to float and remove. Oxide inclusions in the silicon steel are mainly MnO and SiO2、Al2O3For example, MnO has a low melting point (1140 ℃ C.), and the viscosity is lower than that of steel, so that the steel is elongated in the rolling direction during hot rolling. SiO 22High melting point (1723 deg.C), higher viscosity than steel, and no elongation in rolling directionMost of the inclusions in the steel are MnO and SiO2、Al2O3The complex of (1).
Japanese patent application laid-open No. Sho 48-61319, 1973, requires that the oxygen content in molten steel at the time of tapping is controlled to be preferably less than 0.1%, and that aluminum is added in an amount of more than (O% × 8) kg/t for deoxidation, and that residual Al in steel is presentS0.005 percent. When the product of the oxygen content and the aluminum addition amount in the steel is more than 8, w (SiO)2)/w(Al2O3) Is significantly reduced, i.e. SiO2Reduced content of B8The height is increased. Because a large amount of Al is formed2O3SiO is easier to float upwards in the subsequent vacuum treatment and can be used as MnS precipitation core2The number is reduced. With SiO2MnS precipitated as a core is coarse (2-3 micrometers or several tens of micrometers) and is difficult to be solid-solved. The document is very effective for controlling inclusions in steel, but aluminum can reduce harmful elements such as Ti, V and the like in steel slag into molten steel in the tapping process, and finally the magnetic performance of a finished product is influenced.
Japanese patent laid-open publication No. Hei 4-337031, 1992 discloses that Al in steel is contained in MnS or MnSe as an inhibitorSThe Ti and V contents should be as low as possible. It is preferred to use a 75% ferrosilicon alloy containing less than 0.01% Ti and less than 0.05% Al and not use a material containing TiO2And Al2O3The refractory of (1). Adopting low-vanadium molten iron and low-vanadium ferrosilicon alloy to ensure that V in the molten steel is less than or equal to 0.001 percent and B is8Can reach 1.92. Although the purity of the molten steel is greatly improved, the smelting cost is too high due to the use of special alloy and refractory materials, and the method cannot be popularized and used.
Japanese laid-open patent publication No. Hei 9-279246, 1997; hei 10-273715, 1998, proposes controlling the content of Ti and Al in the molten steel after the converter smelting to less than 0.003%, respectively, and adding SiO in an amount of 50% or more from the start of tapping to the end of RH treatment2(silica sand) flux forming an oxidic slag with a basicity of CaO/SiO2Less than or equal to 1.2, oxidizing and refining, adding high melting point flux (such as MgO, SiO) at more than 1500 deg.C2And the like) to solidify slag in a ladle or remove slag after silicon is added in tapping, wherein the contents of Ti and Al in a casting blank are respectively less than 10 ppm. The method adds SiO2The flux can not make molten steelThe content of silicon is reduced and oxides such as aluminum and titanium can be removed, but the document is only applicable to silicon steel containing no aluminum, and if the steel contains aluminum, the content of aluminum in molten steel in the later stage of continuous casting is reduced and the magnetism of the product fluctuates due to oxidation reaction between slag and molten steel during continuous casting of the steel.
Disclosure of Invention
In view of the above, the present application aims to provide a method for controlling the content of titanium in the smelted silicon steel to be less than or equal to 15ppm, so as to solve the problem that the purity of molten steel is affected due to the increase of the content of Ti in the molten steel caused by the increase of Ti in the alloy and the return of steel slag to Ti in the smelting process of the silicon steel.
In order to achieve the purpose, the technical scheme provided by the application is as follows: a method for controlling the titanium content in the smelted silicon steel to be less than or equal to 15ppm comprises the following steps:
alloying in the tapping process, and adding an aluminum-containing additive during alloying to ensure that the aluminum content in molten steel is not more than 0.005 percent;
adding ferrosilicon;
vacuum treatment and post-processing are carried out.
Preferably, before alloying during tapping and adding aluminum-containing additives to make the aluminum content in molten steel not exceed 0.005%, the method further comprises the following steps:
after smelting in a converter, detecting the oxygen content in the molten steel;
accordingly, the adding aluminum-containing additives comprises:
and determining the adding amount of the aluminum-containing additive according to the detected oxygen content.
Preferably, the content of aluminum in the molten steel is not less than 0.001%.
Preferably, the aluminum content in the molten steel refers to AlS(acid-soluble aluminum) content.
Preferably, the determining the adding amount of the aluminum-containing additive according to the detected oxygen content comprises:
the amount of aluminum-containing additive added was determined according to the following formula:
waluminium(0.91 oxygen content) molten steel amount)/pAluminiumSteel/1000 + αWater quantity;
wherein the value range of the coefficient α is [ 0.18-0.26 ]]；wAluminiumIs the weight of the additive containing aluminum, and the unit is kg; the oxygen content is in ppm; the unit of the molten steel amount is t; p is a radical ofAluminiumIs the grade value of the aluminum-containing additive.
Preferably, the aluminum-containing additive is an aluminum block or an aluminum iron.
Preferably, before the vacuum treatment and the post-process, the method further comprises:
and adding bauxite into the ladle when tapping is finished.
Preferably, the adding bauxite into the ladle comprises the following steps:
and adding the bauxite into the steel ladle according to the proportion of adding 0-1.5 kg of bauxite into each ton of molten steel.
Preferably, in the step of adding ferrosilicon, the added amount of the ferrosilicon is not less than 70% of the designed total amount of ferrosilicon in the silicon steel of the furnace and is not more than the designed total amount of ferrosilicon.
Compared with the prior art, the method has the following beneficial effects:
during alloying, the aluminum-containing additive is added firstly and then the ferrosilicon is added, so that the problem that a large amount of SiO is generated by adding the ferrosilicon firstly and deoxidizing can be solved2To make SiO in the ladle slag2The content is too high and is difficult to accurately control, so that the subsequent oxidation reaction of slag and molten steel is caused, the aluminum content in the molten steel in the later stage of continuous casting is reduced, and the aluminum-containing silicon steel cannot be adapted to the problem; meanwhile, Ti in the alloy can be effectively oxidized by controlling the aluminum content not to exceed 0.005%, so that the increase of Ti in the alloy is reduced, the reduction of Ti in the steel slag into molten steel can be reduced, and the return of the steel slag into Ti is reduced; in addition, the return Ti in the steel slag can be further reduced by adding bauxite and the like subsequently to adjust the components of the steel slag. The application has the advantages of simpler operation, more convenient control and better effect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic flow chart of a method for controlling the titanium content in smelted silicon steel to be less than or equal to 15ppm provided in embodiment 1 of the application;
FIG. 2 is a schematic flow chart of the method for controlling the titanium content in the smelted silicon steel to be less than or equal to 15ppm provided in embodiment 2 of the application;
FIG. 3 is a schematic flow chart of the method for controlling the titanium content in the smelted silicon steel to be less than or equal to 15ppm provided in embodiment 3 of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the present application belong. If a definition set forth in this section is contrary to or otherwise inconsistent with a definition set forth in the patents, patent applications, published patent applications, and other publications that are herein incorporated by reference, the definition set forth in this section prevails over the definition that is incorporated herein by reference.
In addition, the weight of the related components mentioned in the description of the embodiments of the present application may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present application as long as it is scaled up or down according to the description of the embodiments of the present application. Specifically, the weight described in the description of the embodiments of the present application may be a unit of weight known in the chemical industry, such as μ g, mg, g, and kg.
Example 1:
referring to fig. 1, embodiment 1 of the present application provides a method for controlling a titanium content in a smelted silicon steel to be not more than 15ppm, including the following steps:
s101, alloying is carried out in the tapping process, and during alloying, an aluminum-containing additive is added, so that the aluminum content in molten steel is not more than 0.005%;
s102, adding ferrosilicon;
s103, carrying out vacuum treatment and post-processing.
In the embodiment, alloying is carried out in the tapping process, and during alloying, an aluminum-containing additive is added firstly, and Al in molten steel is controlledSThe content of O in the molten steel is controlled by the content of acid-soluble aluminum, so that Ti in the alloy is oxidized, Ti in the alloy can be effectively oxidized, the increase of Ti in the alloy is reduced, the reduction of Ti in the steel slag to the molten steel is reduced, and the return of the steel slag to Ti is reduced; in addition, the return Ti in the steel slag can be further reduced by adding bauxite and the like subsequently to adjust the components of the steel slag. Through research and test verification, by implementing the method, when the aluminum content in the molten steel after tapping is controlled to be 0.0010-0.005%, ferrosilicon is added, so that the Ti content in the molten steel is not more than 15ppm, and T [ O ] in the molten steel]The content also does not exceed 15 ppm.
In addition, in the alloying process, the aluminum-containing additive is added firstly and then the ferrosilicon is added, so that the problem that a large amount of SiO is generated by adding the ferrosilicon firstly and deoxidizing can be solved2To make SiO in the ladle slag2The content is too high and is not easy to be accurately controlled, so that the subsequent oxidation reaction of slag and molten steel is caused, and the aluminum content in the molten steel in the later stage of continuous casting is reduced.
The method provided by the embodiment is particularly suitable for producing and preparing the aluminum-containing silicon steel.
Wherein the aluminum-containing additive comprises an aluminum block and aluminum iron.
Wherein the addition amount of the aluminum-containing oxide is such that the aluminum content in the molten steel is not less than 0.001%.
Wherein the aluminum content in the molten steel mainly refers to Al in the molten steelS(acid-soluble aluminum) content.
Further, due to uncertain factors in the reaction process, in the step S102, the adding amount of the silicon iron is not less than 70% of the total design amount of the silicon iron in the silicon steel of the furnace, so that the adding amount of partial silicon iron is reserved for the subsequent process, and the silicon content in the silicon steel is prevented from exceeding the standard. It is understood that the amount of ferrosilicon added in step S102 should not exceed the designed total amount of ferrosilicon.
Example 2:
referring to fig. 2, embodiment 2 of the present application provides a method for controlling the content of titanium in smelted silicon steel to be less than or equal to 15ppm, including steps S201 to S204, where steps S203 to S204 are the same as steps S102 to S103, except that steps S202 and S201 are as follows:
s201, detecting the oxygen content in molten steel after smelting in a converter is finished;
s202, alloying is carried out in the tapping process, and during alloying, the adding amount of the aluminum-containing additive is determined according to the detected oxygen content, so that the aluminum content in the molten steel is not more than 0.005%;
in this example, the oxygen content in the molten steel was measured after the completion of converter smelting, and the amount of the aluminum-containing additive added was determined based on the measured oxygen content during alloying. Specifically, the amount of the aluminum-containing additive added is determined according to the following formula 1:
waluminium(0.91 oxygen content) molten steel amount)/pAluminiumAmount of molten steel/1000 + α;
wherein the value range of the coefficient α is [ 0.18-0.26 ]]；wAluminiumIs the weight of the additive containing aluminum, and the unit is kg; the oxygen content is in ppm; the unit of the molten steel amount is t; p is a radical ofAluminiumIs the grade value of the aluminum-containing additive.
For example, in the above formula 1, the specific value of the coefficient α may be 0.19, 0.2, 0.23, 0.25, or the like.
In the embodiment, the adding amount of the aluminum-containing additive in the steel-tapping alloying process is controlled according to the oxygen content in the molten steel when the converter taps, so that the aluminum content in the molten steel after tapping is not more than 0.005%. Tests prove that when the aluminum content is less than 0.005 percent after tapping, the Ti content in the molten steel is not more than 15 ppm.
Example 3
Referring to fig. 3, embodiment 3 of the present application provides a method for controlling a titanium content in a smelted silicon steel to be less than or equal to 15ppm, including S301 to S305, where S301 to S303 and S305 are the same as S201 to S204, and are not described herein again, except that in step S304, the following details are described:
and S304, adding bauxite into the steel ladle when tapping is finished.
In the embodiment, bauxite is added into the ladle after tapping, so that the slag components of the ladle can be further adjusted to reduce the return of Ti in the slag. Specifically, the bauxite is added into the steel ladle according to the proportion of 0-1.5 kg added in per ton of molten steel. Alternatively, the weight ratio of bauxite to molten steel is 0.1, 0.3, 0.5, 0.7, 0.8, 1.0, 1.2 or 1.5.
Example 4:
smelting silicon steel according to the method in the embodiment of the application (weight percentage): c: 0.02 to 0.05%, Si: 3.00-3.35%, Mn 0.04-0.50%, S: 0.003-0.020% of AlS: 0.012-0.040%, and the rest components are not limited. Table 1 shows: comparing the parameters of the tundish molten steel obtained by smelting in the invention example and the comparative example, wherein the invention example is to control AlS(acid-soluble aluminum) content of not more than 0.005% in the comparative example, control of AlS(acid-soluble aluminum) content of more than 0.005% in the test, it is found that the value of β is in the range of 0 to 1.5, including 0 and 1.5, where the coefficient β is the ratio (in kg/t) of bauxite added to the ladle.
TABLE 1
As can be seen from Table 1, by controlling Al after tappingSThe content of titanium in the silicon steel can be effectively controlled to be less than or equal to 15 ppm. As can also be seen from Table 1, Al is present after tappingSWhen the content is not more than 0.005%, the total oxygen content T [ O ] in the molten steel]Nor more than 15 ppm. It should be noted that all of the inventive examples in Table 1 are obtained by controlling the Al content after tapping according to the formula 1 and the oxygen content during tapping from the converterSExamples of the contents.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. A method for controlling the titanium content in the smelted silicon steel to be less than or equal to 15ppm is characterized by comprising the following steps:
alloying in the tapping process, and adding an aluminum-containing additive during alloying to ensure that the aluminum content in molten steel is not more than 0.005 percent;
adding ferrosilicon;
vacuum treatment and post-processing are carried out.
2. The method for controlling the content of titanium in the smelted silicon steel to be less than or equal to 15ppm according to claim 1, wherein the alloying is carried out during the tapping, and before adding an aluminum-containing additive during the alloying and ensuring that the content of aluminum in molten steel is not more than 0.005 percent, the method further comprises the following steps:
after smelting in a converter, detecting the oxygen content in the molten steel;
accordingly, the adding aluminum-containing additives comprises:
and determining the adding amount of the aluminum-containing additive according to the detected oxygen content.
3. The method of controlling the titanium content in the metallurgical silicon steel to be less than or equal to 15ppm as set forth in claim 2, wherein the determining the amount of the aluminum-containing additive based on the detected oxygen content comprises:
the amount of aluminum-containing additive added was determined according to the following formula:
waluminium(0.91 oxygen content) molten steel amount)/pAluminiumAmount of molten steel/1000 + α;
wherein the value range of the coefficient α is [ 0.18-0.26 ]]；wAluminiumIs the weight of the additive containing aluminum, and the unit is kg; the oxygen content is in ppm; the unit of the molten steel amount is t; p is a radical ofAluminiumIs the grade value of the aluminum-containing additive.
4. The method for controlling the titanium content in the smelted silicon steel to be less than or equal to 15ppm according to claim 1, wherein the aluminum content in the molten steel is not less than 0.001%.
5. The method for controlling the titanium content in the smelted silicon steel to be less than or equal to 15ppm according to claim 1, wherein the aluminum-containing additive is an aluminum block or aluminum iron.
6. The method for controlling the titanium content in the smelted silicon steel to be less than or equal to 15ppm according to any one of claims 1 to 5, characterized by further comprising the following steps of:
and adding bauxite into the ladle when tapping is finished.
7. The method for controlling the titanium content in the smelted silicon steel to be less than or equal to 15ppm as claimed in claim 6, wherein the adding of bauxite into the ladle comprises the following steps:
and adding the bauxite into the steel ladle according to the proportion of adding 0-1.5 kg of bauxite into each ton of molten steel.
8. The method for controlling the content of titanium in smelted silicon steel to be less than or equal to 15ppm according to any one of claims 1 to 5, wherein in the step of adding the ferrosilicon, the added amount of the ferrosilicon is not less than 70% of the designed total amount of the ferrosilicon in the silicon steel of the furnace and is not more than the designed total amount of the ferrosilicon.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04107239A (en) * | 1990-08-27 | 1992-04-08 | Kawasaki Steel Corp | Method for melting silicon steel stock |
| CN104975142A (en) * | 2014-04-10 | 2015-10-14 | 鞍钢股份有限公司 | Alloy adding method in refining process of non-oriented low-grade aluminum-containing silicon steel |
| CN105385808A (en) * | 2015-11-11 | 2016-03-09 | 武汉钢铁(集团)公司 | Method for controlling titanium content in smelted high-magnetic-strength oriented silicon steel to be lower than or equal to 20 ppm |
| CN108396102A (en) * | 2018-05-28 | 2018-08-14 | 成都先进金属材料产业技术研究院有限公司 | The method of electric furnace smelting special steel molten steel |
| CN109797264A (en) * | 2019-01-14 | 2019-05-24 | 包头钢铁（集团）有限责任公司 | A kind of control method and silicon steel production method of silicon steel Ti content |
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2020
- 2020-04-03 CN CN202010258180.9A patent/CN111471827A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04107239A (en) * | 1990-08-27 | 1992-04-08 | Kawasaki Steel Corp | Method for melting silicon steel stock |
| CN104975142A (en) * | 2014-04-10 | 2015-10-14 | 鞍钢股份有限公司 | Alloy adding method in refining process of non-oriented low-grade aluminum-containing silicon steel |
| CN105385808A (en) * | 2015-11-11 | 2016-03-09 | 武汉钢铁(集团)公司 | Method for controlling titanium content in smelted high-magnetic-strength oriented silicon steel to be lower than or equal to 20 ppm |
| CN108396102A (en) * | 2018-05-28 | 2018-08-14 | 成都先进金属材料产业技术研究院有限公司 | The method of electric furnace smelting special steel molten steel |
| CN109797264A (en) * | 2019-01-14 | 2019-05-24 | 包头钢铁（集团）有限责任公司 | A kind of control method and silicon steel production method of silicon steel Ti content |
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