CN114622129A - Production method for preparing ultralow-carbon low-aluminum high-silicon steel by LF + RH duplex method - Google Patents
Production method for preparing ultralow-carbon low-aluminum high-silicon steel by LF + RH duplex method Download PDFInfo
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 45
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 238000007670 refining Methods 0.000 claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 18
- 239000011572 manganese Substances 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 14
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 10
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 10
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 8
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000010703 silicon Substances 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 64
- 238000005096 rolling process Methods 0.000 claims description 51
- 229910052742 iron Inorganic materials 0.000 claims description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 25
- 229910052760 oxygen Inorganic materials 0.000 claims description 25
- 239000001301 oxygen Substances 0.000 claims description 25
- 238000009749 continuous casting Methods 0.000 claims description 21
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 238000007664 blowing Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000006477 desulfuration reaction Methods 0.000 claims description 10
- 230000023556 desulfurization Effects 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 4
- 238000005261 decarburization Methods 0.000 claims description 4
- 238000007872 degassing Methods 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract description 6
- 238000003723 Smelting Methods 0.000 abstract description 4
- 238000005275 alloying Methods 0.000 abstract description 3
- 229910000805 Pig iron Inorganic materials 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- 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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C21C2007/0093—Duplex process; Two stage processes
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Abstract
The invention discloses a production method for preparing ultra-low-carbon low-aluminum high-silicon steel by an LF + RH duplex method, which is prepared from the following raw materials in percentage by mass: c is less than or equal to 0.0040%, Si: 0.06-0.10%, Mn: 0.10 to 0.50 percent of Al, less than or equal to 0.0015 percent of P, less than or equal to 0.008 percent of S and less than or equal to 0.006 percent of Al; the balance of Fe and inevitable impurity elements, the invention is suitable for the technical field of steel smelting, the invention adopts an LF + RH duplex process to ensure that the main elements C are less than or equal to 0.0040 percent, Si: 0.60-0.10%, Mn: 0.10-0.50%, P is less than or equal to 0.0015%, S is less than or equal to 0.008%, and Al is less than or equal to 0.006%. Particularly, in RH refining, ferrosilicon and metal manganese are added in batches for alloying, Al particles are adopted for deoxidation, wherein the ferrosilicon alloy contains partial Al, the requirements of ultra-low carbon and ultra-low aluminum are ensured, and the requirements of silicon and manganese contents are met.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a production method for preparing ultralow-carbon low-aluminum high-silicon steel by an LF + RH duplex method.
Background
Iron and steel smelting is a general term for steel and iron metallurgical technological processes. The iron produced in industry is divided into pig iron according to the carbon content, and the carbon content is more than 2%; steel, with a carbon content of less than 2%.
Most of modern iron making adopts blast furnace iron making, and a direct reduction iron making method and an electric furnace iron making method are respectively adopted. The steel-making is mainly to use pig iron smelted by a blast furnace, sponge iron smelted by a direct reduction iron-making method and scrap steel as raw materials and to smelt steel by different methods. The basic production process is that iron ore is smelted into pig iron in an iron-smelting furnace, then the pig iron is used as raw material, and is smelted into steel by different methods, and then the steel is casted into steel ingot or continuous casting billet.
Compared with patent 201910244147.8, the high-purity ultra-low-carbon low-aluminum steel has the main control range of carbon content of 0.01-0.040% and Mn content not more than 0.08%, and does not adopt RH refining furnace;
compared with patent 201810898692.4, the method for controlling free oxygen in ultra-low carbon low aluminum steel produces Si less than or equal to 0.03% and Mn less than or equal to 0.04% without using LF refining furnace.
In combination with the above, the high silicon steel produced in this way cannot meet the requirements of ultra-low carbon and ultra-low aluminum.
Therefore, it is necessary to provide a production method for preparing ultra-low carbon low aluminum high silicon steel by an LF + RH duplex method to solve the technical problems.
Disclosure of Invention
The invention aims to provide a production method for preparing ultra-low-carbon low-aluminum high-silicon steel by an LF + RH duplex method, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a production method for preparing ultra-low carbon low aluminum high silicon steel by an LF + RH duplex method comprises the following raw materials by mass percent: c is less than or equal to 0.0040%, Si: 0.06-0.10%, Mn: 0.10 to 0.50 percent of Al, less than or equal to 0.0015 percent of P, less than or equal to 0.008 percent of S and less than or equal to 0.006 percent of Al; the balance of Fe and inevitable impurity elements.
As a further scheme of the invention, the anti-aging agent is prepared from the following raw materials in percentage by mass: c is less than or equal to 0.0040%, Si: 0.06-0.08%, Mn: 0.10 to 0.40 percent of P, less than or equal to 0.0015 percent of S, less than or equal to 0.008 percent of Al and less than or equal to 0.006 percent of Al; the balance of Fe and inevitable impurity elements.
As a further scheme of the invention, the process of the production method of the ultra-low carbon, low aluminum and high silicon comprises the following steps:
the method comprises the following steps: pretreatment of raw materials
Taking out the raw material, and treating the raw material, wherein the treated raw material is a blank I;
step two: desulfurization of
Carrying out desulphurization operation on the blank I through molten iron pretreatment, and obtaining a blank II after desulphurization;
step three: converter
Putting the second blank into a converter, and processing by adopting a bottom blowing mode of low-carbon steel to form a third blank;
step four: LF refining
Refining and processing the blank III in the third step through LF;
step five: RH refining
Carrying out RH refining on the blank processed in the fourth step for processing to form a blank IV;
step six: continuous casting
Placing the fourth blank in a continuous casting furnace, and carrying out a continuous casting process under the condition of submerging molten steel to form a fifth blank;
step seven: heating of
Heating the blank V, and adopting a three-section heating mode;
step eight: descaling
Descaling the heated blank by using a descaling agent;
step nine: rolling of
And (5) rolling the blank heated in the step eight, and finally stretching and flattening.
As a further scheme of the invention, the slag quantity of molten iron in the pretreatment of the molten iron in the second step is less than or equal to 0.5 percent, the temperature of the molten iron is more than or equal to 1320 ℃, and the desulfurization end point [ S ] of the molten iron is less than or equal to 0.002 percent.
As a further scheme of the invention, the final temperature of the converter in the third step is more than or equal to 1650 ℃, the component target [ P ] is less than or equal to 0.020%, and [ S ] is less than or equal to 0.008%.
As a further scheme of the invention, the RH refining operation in the fifth step is as follows:
first, RH to-station reference temperature: the 1 st furnace 1640 and 1650 ℃ and the continuous casting furnace 1620 and 1630 ℃;
secondly, the clearance of the steel ladle is 400-600mm, and the thickness of a slag layer is less than or equal to 250 mm;
thirdly, the temperature and the oxygen content are firstly measured when the molten steel arrives at the station;
fourthly, the ring flow of argon is more than or equal to 80m3/h during oxygen blowing, the ring flow of argon is more than or equal to 100m3/h during pure degassing, oxygen blowing operation is started within 4min of starting pumping, and oxygen blowing operation is carried out under the state that a primary pump is opened;
fifthly, the metal manganese alloy is added after the RH extraction is carried out for 3-5 min;
sixthly, starting pumping for about 16min, finishing decarburization, measuring temperature and determining oxygen;
seventhly, adding aluminum particles according to the constant oxygen value;
eighthly, after ferrosilicon and aluminum particles are added for 2-3 min, taking a component sample for inspection, and supplementing alloy and aluminum particles according to the component range;
ninthly, the net cycle time is more than or equal to 8min, the reference temperature of the station is 1585-;
and tenthly, finishing the RH treatment until the continuous casting time is more than or equal to 28 min.
As a further scheme of the invention, the liquidus temperature of the molten steel in the sixth step is 1525 ℃, and the superheat degree is 15-30 ℃.
As a further aspect of the present invention, in the seventh step, the three-stage heating mode includes: the first gear mode is 1.5h to 3.0 h; the second gear mode is 3.0h to 5.0 h; the third gear mode is 5.0h to 8.0 h.
As a further scheme of the invention, the descaling pressure of the descaling process in the step eight is not less than 16 MPa.
As a further scheme of the invention, the rolling in the ninth step is divided into rough rolling and finish rolling, wherein the finish rolling temperature of the rough rolling in the first gear mode is 1050 ℃ to 1090 ℃, and the finish rolling temperature of the finish rolling is 870 ℃ to 910 ℃; in the second gear mode, the rough rolling finishing temperature is 1030 ℃ to 1070 ℃, and the finish rolling finishing temperature is 870 ℃ to 910 ℃; in the third mode, the rough rolling finishing temperature is 1010-1050 ℃, and the finish rolling finishing temperature is 870-910 ℃.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts an LF + RH duplex process to ensure that the main elements C are less than or equal to 0.0040 percent, Si: 0.60-0.10%, Mn: 0.10-0.50%, P is less than or equal to 0.0015%, S is less than or equal to 0.008%, and Al is less than or equal to 0.006%. Particularly, in RH refining, ferrosilicon and metal manganese are added in batches for alloying, Al particles are adopted for deoxidation, wherein the ferrosilicon alloy contains partial Al, the requirements of ultra-low carbon and ultra-low aluminum are ensured, and the requirements of silicon and manganese contents are met.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic flow chart of the production method of the ultra-low carbon low aluminum high silicon steel of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention. In addition, for the convenience of description, the terms "upper", "lower", "left" and "right" are used to refer to the same direction as the upper, lower, left, right, etc. of the drawings, and the terms "first", "second", etc. are used for descriptive distinction and have no special meaning.
[ example 1 ]
A production method for preparing ultra-low carbon low aluminum high silicon steel by an LF + RH duplex method comprises the following raw materials by mass percent: c: 0.0040%, Si: 0.10%, Mn: 0.50%, P: 0.0015%, S: 0.008%, Al: 0.006%; the balance of Fe and inevitable impurity elements.
The production method of the ultra-low carbon, low aluminum and high silicon comprises the following processes:
taking out the raw material, and treating the raw material, wherein the treated raw material is a blank I; carrying out desulfurization operation on the first blank through molten iron pretreatment, and obtaining a second blank after desulfurization; putting the second blank into a converter, and processing by adopting a bottom blowing mode of low-carbon steel to form a third blank; refining and processing the blank III through LF; carrying out RH refining on the blank processed in the LF refining to process to form a blank IV; placing the fourth blank in a continuous casting furnace, and carrying out a continuous casting process under the condition of submerging molten steel to form a fifth blank; heating the blank V, and adopting a three-section heating mode; descaling the heated blank by using a descaling agent; and rolling the heated blank, and finally stretching and flattening.
In the pretreatment of the molten iron in the second step, the slag quantity of the molten iron is less than or equal to 0.5 percent, the temperature of the molten iron is more than or equal to 1320 ℃, and the desulfurization end point [ S ] of the molten iron is less than or equal to 0.002 percent.
In the third step, the end temperature of the converter is more than or equal to 1650 ℃, the component target [ P ] is less than or equal to 0.020%, and the [ S ] is less than or equal to 0.008%.
The operation of RH refining in step five is as follows:
first, RH to station reference temperature: the temperature of a furnace 1 is 1640 ℃, and a continuous casting furnace 1620 ℃;
secondly, the clearance of the steel ladle is 400-600mm, and the thickness of a slag layer is less than or equal to 250 mm;
thirdly, the temperature and the oxygen content are firstly measured when the molten steel arrives at the station;
fourthly, the ring flow of argon is more than or equal to 80m3/h during oxygen blowing, the ring flow of argon is more than or equal to 100m3/h during pure degassing, oxygen blowing operation is started within 4min of starting pumping, and oxygen blowing operation is carried out under the state that a primary pump is opened;
fifthly, the metal manganese alloy is added after the RH extraction is carried out for 3-5 min;
sixthly, starting pumping for about 16min, finishing decarburization, measuring temperature and determining oxygen;
seventhly, adding aluminum particles according to the constant oxygen value;
eighthly, after ferrosilicon and aluminum particles are added for 2-3 min, taking a component sample for inspection, and supplementing alloy and aluminum particles according to the component range;
ninthly, the net cycle time is more than or equal to 8min, the temperature is taken out of the furnace 1 at 1585 ℃, and the temperature of the continuous casting furnace is 1575 ℃;
tenthly, finishing the RH treatment until the continuous casting time is more than or equal to 28 min.
The liquidus temperature of the molten steel in the sixth step is 1525 ℃, and the superheat degree is 15-30 ℃.
In the seventh step, the three-stage heating modes are respectively as follows: the first gear mode is 1.5h to 3.0 h; the second gear mode is 3.0h to 5.0 h; the third gear mode is 5.0h to 8.0 h.
And the descaling pressure of the descaling process in the step eight is not less than 16 MPa.
The rolling in the ninth step is divided into rough rolling and finish rolling, wherein the finish rolling temperature of the rough rolling in the first gear mode is 1050 ℃, and the finish rolling temperature of the finish rolling is 870 ℃; in the second gear mode, the rough rolling finishing temperature is 1030 ℃, and the finish rolling finishing temperature is 870 ℃; in the third mode, the rough rolling finishing temperature is 1010 ℃, and the finish rolling finishing temperature is 870 ℃.
[ example 2 ]
A production method for preparing ultra-low carbon low aluminum high silicon steel by an LF + RH duplex method comprises the following raw materials by mass percent: c: 0.0030%, Si: 0.06%, Mn: 0.10%, P: 0.001%, S: 0.006%, Al: 0.005 percent; the balance of Fe and inevitable impurity elements.
The production method of the ultra-low carbon, low aluminum and high silicon comprises the following processes:
taking out the raw material, and treating the raw material, wherein the treated raw material is a blank I; carrying out desulphurization operation on the blank I through molten iron pretreatment, and obtaining a blank II after desulphurization; putting the second blank into a converter, and processing by adopting a bottom blowing mode of low-carbon steel to form a third blank; refining and processing the blank III through LF; carrying out RH refining on the blank processed in the LF refining to process to form a blank IV; placing the fourth blank in a continuous casting furnace, and carrying out a continuous casting process under the condition of submerging molten steel to form a fifth blank; heating the blank V, and adopting a three-section heating mode; descaling the heated blank by using a descaling agent; and rolling the heated blank, and finally stretching and flattening.
In the pretreatment of the molten iron in the second step, the slag quantity of the molten iron is less than or equal to 0.5 percent, the temperature of the molten iron is more than or equal to 1320 ℃, and the desulfurization end point [ S ] of the molten iron is less than or equal to 0.002 percent.
In the third step, the end temperature of the converter is more than or equal to 1650 ℃, the component target [ P ] is less than or equal to 0.020%, and [ S ] is less than or equal to 0.008%.
The operation of RH refining in step five is as follows:
first, RH to station reference temperature: 1650 ℃ in the furnace 1 and 1630 ℃ in a continuous casting furnace;
secondly, the clearance of the steel ladle is 400-600mm, and the thickness of a slag layer is less than or equal to 250 mm;
thirdly, the temperature and the oxygen content are firstly measured when the molten steel arrives at the station;
fourthly, the ring flow of argon is more than or equal to 80m3/h during oxygen blowing, the ring flow of argon is more than or equal to 100m3/h during pure degassing, oxygen blowing operation is started within 4min of starting pumping, and oxygen blowing operation is carried out under the state that a primary pump is opened;
fifthly, the metal manganese alloy is added after the RH extraction is carried out for 3-5 min;
sixthly, pumping for about 16min, finishing decarburization, measuring the temperature and determining the oxygen;
seventhly, adding aluminum particles according to the constant oxygen value;
eighthly, after ferrosilicon and aluminum particles are added for 2-3 min, taking a component sample for inspection, and supplementing alloy and aluminum particles according to the component range;
ninthly, the net cycle time is more than or equal to 8min, the reference temperature of the station is out, the temperature of the furnace 1 ℃ is 1600 ℃, and the continuous casting furnace is 1590 ℃;
and tenthly, finishing the RH treatment until the continuous casting time is more than or equal to 28 min.
The liquidus temperature of the molten steel in the sixth step is 1525 ℃, and the superheat degree is 15-30 ℃.
The three-stage heating modes in the step seven are respectively as follows: the first gear mode is 1.5h to 3.0 h; the second gear mode is 3.0h to 5.0 h; the third gear mode is 5.0h to 8.0 h.
And the descaling pressure of the descaling process in the step eight is not less than 16 MPa.
The rolling in the ninth step is divided into rough rolling and finish rolling, wherein the finish rolling temperature of the rough rolling in the first gear mode is 1090 ℃ and the finish rolling temperature of the finish rolling is 910 ℃; in the second gear mode, the rough rolling finishing temperature is 1070 ℃, and the finish rolling finishing temperature is 910 ℃; in the third mode, the rough rolling finishing temperature is 1050 ℃, and the finish rolling finishing temperature is 910 ℃.
Comparing example 1 and example 2, it can be seen that: by adopting an LF + RH duplex process, the main elements C are less than or equal to 0.0040 percent, and Si: 0.60-0.10%, Mn: 0.10-0.50%, P is less than or equal to 0.0015%, S is less than or equal to 0.008%, and Al is less than or equal to 0.006%. Particularly, in RH refining, ferrosilicon and metal manganese are added in batches for alloying, Al particles are adopted for deoxidation, wherein the ferrosilicon alloy contains partial Al, the requirements of ultra-low carbon and ultra-low aluminum are ensured, and the requirements of silicon and manganese contents are met.
Table 1 shows the elemental composition (wt%) of example 1 and example 2 as follows:
table 2 shows the liquidus temperatures and tundish temperatures for examples 1 and 2 as follows:
table 3 shows the heating schedules for example 1 and example 2 as follows:
table 4 shows the rolling process temperatures for example 1 and example 2 as follows:
the above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (10)
1. A production method for preparing ultra-low carbon low aluminum high silicon steel by an LF + RH duplex method is characterized in that: the composite material is prepared from the following raw materials in percentage by mass: c is less than or equal to 0.0040%, Si: 0.06-0.10%, Mn: 0.10 to 0.50 percent of Al, less than or equal to 0.0015 percent of P, less than or equal to 0.008 percent of S and less than or equal to 0.006 percent of Al; the balance of Fe and inevitable impurity elements.
2. The production method for preparing the ultra-low-carbon low-aluminum high-silicon steel by the LF + RH duplex method according to claim 1, which is characterized by comprising the following steps: the composite material is prepared from the following raw materials in percentage by mass: c is less than or equal to 0.0040%, Si: 0.06-0.08%, Mn: 0.10 to 0.40 percent of the total weight of the alloy, less than or equal to 0.0015 percent of P, less than or equal to 0.008 percent of S and less than or equal to 0.006 percent of Al; the balance of Fe and inevitable impurity elements.
3. The production method for preparing the ultra-low-carbon low-aluminum high-silicon steel by the LF + RH duplex method according to claim 1, which is characterized by comprising the following steps: the production method of the ultra-low carbon, low aluminum and high silicon comprises the following processes:
the method comprises the following steps: pretreatment of raw materials
Taking out the raw material, and treating the raw material, wherein the treated raw material is a blank I;
step two: desulfurization of
Carrying out desulfurization operation on the first blank through molten iron pretreatment, and obtaining a second blank after desulfurization;
step three: converter furnace
Putting the second blank into a converter, and processing by adopting a bottom blowing mode of low-carbon steel to form a third blank;
step four: LF refining
Refining and processing the blank III in the third step through LF;
step five: RH refining
Carrying out RH refining on the blank processed in the fourth step for processing to form a blank IV;
step six: continuous casting
Placing the fourth blank in a continuous casting furnace, and carrying out a continuous casting process under the condition of submerging molten steel to form a fifth blank;
step seven: heating of
Heating the blank V, and adopting a three-section heating mode;
step eight: descaling
Descaling the heated blank by using a descaling agent;
step nine: rolling of
And (5) rolling the blank heated in the step eight, and finally stretching and flattening.
4. The production method for preparing the ultra-low-carbon low-aluminum high-silicon steel by the LF + RH duplex method according to claim 3, which is characterized by comprising the following steps: in the pretreatment of the molten iron in the second step, the slag quantity of the molten iron is less than or equal to 0.5 percent, the temperature of the molten iron is more than or equal to 1320 ℃, and the desulfurization end point [ S ] of the molten iron is less than or equal to 0.002 percent.
5. The production method for preparing the ultra-low-carbon low-aluminum high-silicon steel by the LF + RH duplex method according to claim 3, which is characterized by comprising the following steps: the final temperature of the converter in the third step is more than or equal to 1650 ℃, the component target [ P ] is less than or equal to 0.020%, and [ S ] is less than or equal to 0.008%.
6. The production method for preparing the ultra-low-carbon low-aluminum high-silicon steel by the LF + RH duplex method according to claim 3, which is characterized by comprising the following steps: the operation of RH refining in the fifth step is as follows:
first, RH to-station reference temperature: the 1 st furnace 1640 and 1650 ℃ and the continuous casting furnace 1620 and 1630 ℃;
secondly, the clearance of the steel ladle is 400-600mm, and the thickness of a slag layer is less than or equal to 250 mm;
thirdly, the temperature and the oxygen content are firstly measured when the molten steel arrives at the station;
fourthly, the ring flow of argon is more than or equal to 80m3/h during oxygen blowing, the ring flow of argon is more than or equal to 100m3/h during pure degassing, oxygen blowing operation is started within 4min of starting pumping, and oxygen blowing operation is carried out under the state that a primary pump is opened;
fifthly, pumping the metal manganese alloy at RH for 3-5 min and then adding the metal manganese alloy;
sixthly, starting pumping for about 16min, finishing decarburization, measuring temperature and determining oxygen;
seventhly, adding aluminum particles according to the constant oxygen value;
eighthly, after ferrosilicon and aluminum particles are added for 2-3 min, taking a component sample for inspection, and supplementing alloy and aluminum particles according to the component range;
ninthly, the net cycle time is more than or equal to 8min, the reference temperature of the station is 1585-;
tenthly, finishing the RH treatment until the continuous casting time is more than or equal to 28 min.
7. The production method for preparing the ultra-low-carbon low-aluminum high-silicon steel by the LF + RH duplex method according to claim 3, which is characterized by comprising the following steps: the liquidus temperature of the molten steel in the sixth step is 1525 ℃, and the superheat degree is 15-30 ℃.
8. The production method for preparing the ultra-low-carbon low-aluminum high-silicon steel by the LF + RH duplex method according to claim 3, which is characterized by comprising the following steps: in the seventh step, the three-stage heating mode is respectively as follows: the first gear mode is 1.5h to 3.0 h; the second gear mode is 3.0h to 5.0 h; the third gear mode is 5.0h to 8.0 h.
9. The production method for preparing the ultra-low-carbon low-aluminum high-silicon steel by the LF + RH duplex method as claimed in claim 3, which is characterized in that: and the descaling pressure of the descaling process in the step eight is not less than 16 MPa.
10. The production method for preparing the ultra-low-carbon low-aluminum high-silicon steel by the LF + RH duplex method according to claim 3, which is characterized by comprising the following steps: the rolling in the ninth step is divided into rough rolling and finish rolling, wherein the finish rolling temperature of the rough rolling in the first gear mode is 1050-1090 ℃, and the finish rolling temperature of the finish rolling is 870-910 ℃; in the second gear mode, the rough rolling finishing temperature is 1030 ℃ to 1070 ℃, and the finish rolling finishing temperature is 870 ℃ to 910 ℃; in the third mode, the rough rolling finishing temperature is 1010-1050 ℃, and the finish rolling finishing temperature is 870-910 ℃.
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