CN114752725A - Pickled plate and production method thereof - Google Patents
Pickled plate and production method thereof Download PDFInfo
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- CN114752725A CN114752725A CN202210341622.5A CN202210341622A CN114752725A CN 114752725 A CN114752725 A CN 114752725A CN 202210341622 A CN202210341622 A CN 202210341622A CN 114752725 A CN114752725 A CN 114752725A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 165
- 239000010959 steel Substances 0.000 claims abstract description 165
- 238000005266 casting Methods 0.000 claims abstract description 42
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 33
- 238000005275 alloying Methods 0.000 claims abstract description 29
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 28
- 238000007670 refining Methods 0.000 claims abstract description 24
- 229910000616 Ferromanganese Inorganic materials 0.000 claims abstract description 21
- 238000003723 Smelting Methods 0.000 claims abstract description 21
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000005554 pickling Methods 0.000 claims abstract description 19
- 229910052742 iron Inorganic materials 0.000 claims abstract description 15
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910000720 Silicomanganese Inorganic materials 0.000 claims abstract description 13
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000005098 hot rolling Methods 0.000 claims abstract description 8
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 58
- 229910052757 nitrogen Inorganic materials 0.000 claims description 29
- 229910052717 sulfur Inorganic materials 0.000 claims description 23
- 229910052748 manganese Inorganic materials 0.000 claims description 19
- 238000010079 rubber tapping Methods 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 16
- 239000012535 impurity Substances 0.000 claims description 14
- 229910052758 niobium Inorganic materials 0.000 claims description 14
- 229910052719 titanium Inorganic materials 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 239000011593 sulfur Substances 0.000 claims description 13
- 229910052698 phosphorus Inorganic materials 0.000 claims description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 9
- 239000002253 acid Substances 0.000 abstract description 11
- 238000004886 process control Methods 0.000 abstract description 3
- 239000011572 manganese Substances 0.000 description 17
- 239000010936 titanium Substances 0.000 description 14
- 239000010955 niobium Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 229910000914 Mn alloy Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 229910000592 Ferroniobium Inorganic materials 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- GZFZKHHBOAMLHZ-UHFFFAOYSA-N [Ti].[Nb].[Mn].[C] Chemical compound [Ti].[Nb].[Mn].[C] GZFZKHHBOAMLHZ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
- C21C7/04—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
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The application discloses a pickled plate and a production method thereof. The production method of the pickled plate comprises the following steps: adding molten iron and scrap steel into a converter for converter smelting to obtain molten steel; after the molten steel is discharged from the converter and transferred into a ladle refining furnace, adding an aluminum block, silicomanganese and low-carbon ferromanganese into the molten steel for deoxidation and alloying to obtain deoxidized alloyed molten steel; adding ladle casting residues into the deoxidized alloying molten steel in the early slagging stage of a ladle refining furnace, and then adding high-carbon ferromanganese and ferrotitanium alloy to obtain refined molten steel; and continuously casting, hot rolling, cooling, coiling and pickling the refined molten steel to obtain a pickled plate. The production method of the acid pickling plate provided by the application has the advantages of low process control difficulty, strong operability and simple method, and the prepared acid pickling plate has good quality, high tensile strength and low production cost.
Description
Technical Field
The application belongs to the technical field of acid pickling plate manufacturing, and particularly relates to an acid pickling plate and a production method thereof.
Background
The pickled plate is an intermediate product which takes a high-quality hot-rolled sheet as a raw material, is subjected to oxide layer removal, edge cutting and finishing by an acid pickling unit, has quality and use requirements between those of a hot-rolled plate and a cold-rolled plate, is an ideal substitute product for a part of the hot-rolled plate and the cold-rolled plate, and is widely applied to the fields of vehicles, machinery, buildings and the like.
However, at present, steel mills at home and abroad mostly adopt carbon-manganese-niobium-titanium system components to synthesize the acid-pickled plates, so that on one hand, the cost is too high, the market competitiveness is poor, and the performance of the steel mills is seriously influenced; on the other hand, due to the influence of the component composition and the production process, the problems of large crack tendency, easy occurrence of transverse corner cracks and segregation at the corners of the casting blank, high grade of sulfide inclusions and the like in the continuous casting production process seriously influence the quality and the strength of the pickled plate.
Disclosure of Invention
The application provides a pickled plate and a production method thereof, and aims to solve the problems of poor quality, low strength and high production cost of the pickled plate.
In one aspect, an embodiment of the present application provides a method for producing a pickled plate, where the method includes: smelting in a converter: adding molten iron and scrap steel into a converter for converter smelting to obtain molten steel; wherein, based on the total weight of the molten iron and the scrap steel, the weight of the scrap steel accounts for 25-32%;
deoxidizing and alloying: after molten steel is discharged from a converter and transferred into a ladle refining furnace, adding aluminum blocks, silicomanganese and low-carbon ferromanganese into the molten steel for deoxidation and alloying to obtain deoxidized alloyed molten steel;
ladle refining: in the early slagging stage of the ladle refining furnace, adding ladle casting residues into deoxidized and alloyed molten steel, and then adding high-carbon ferromanganese and ferrotitanium alloy to obtain refined molten steel; wherein the nitrogen content in the refined molten steel is less than 65 ppm;
Casting blank forming: and continuously casting, hot rolling, cooling, coiling and pickling the refined molten steel to obtain a pickled plate.
According to an embodiment of an aspect of the present application, in the converter smelting step, the volume of the scrap added to the converter is less than 1m3。
According to an embodiment of an aspect of the present application, in the deoxidation alloying step, the molten steel is tapped from the converter as red-pack tap steel, and the temperature of the inner wall of the steel pack is > 800 ℃.
According to an embodiment of one aspect of the present application, in the deoxidation alloying step, an aluminum ingot is added to the molten steel, and the addition amount of the aluminum ingot is 1.1 to 1.5kg based on the weight of 1 ton of the molten steel.
According to an embodiment of one aspect of the present application, in the deoxidation alloying step, silicomanganese is added to the molten steel, the addition amount of the silicomanganese is 2.2-2.6 kg based on the weight of 1 ton of the molten steel, and the nitrogen content of the silicomanganese is 40 +/-15 ppm.
According to an embodiment of one aspect of the present application, in the deoxidation alloying step, low carbon ferromanganese is added to the molten steel, the addition amount of the low carbon ferromanganese is 1.2-1.6 kg based on the weight of 1 ton of the molten steel, and the nitrogen content of the low carbon ferromanganese is 120 ± 30 ppm.
According to an embodiment of an aspect of the present application, in the ladle refining step, ladle casting residues are added to deoxidized alloyed molten steel, wherein the ladle casting residues are selected from casting residues of low-sulfur steel species.
According to an embodiment of an aspect of the present application, the sulfur content of the low-sulfur steel grade is less than 0.008%.
According to an embodiment of one aspect of the application, in the casting blank forming step, the chemical composition of the pickled plate comprises the following components in percentage by weight: c: 0.04-0.065%, Si is less than or equal to 0.1%, Mn: 0.4-1.0%, P is less than or equal to 0.02%, S is less than or equal to 0.006%, Ti: 0.01-0.06%, Nb less than or equal to 0.03%, and the balance of Fe and inevitable impurities.
According to an embodiment of one aspect of the application, in the step of casting blank forming, the chemical composition of the pickled plate comprises the following components in percentage by weight: c: 0.05%, Si: 0.06%, Mn: 0.55%, P: 0.015%, S: 0.004%, Ti: 0.05%, Nb: 0.013% and the balance Fe and unavoidable impurities.
Compared with the prior art, the application has at least the following beneficial effects:
by improving the chemical components and the production process of the pickled plate, the prepared pickled plate has good quality, no cracks and no warping, and the pickled plate has high tensile strength and low production cost.
(1) The use amount of Mn and Nb in the pickled plate is reduced, the content of harmful substance niobium carbonitride can be reduced, the crack sensitivity of the pickled plate in the continuous casting production process is further reduced, and the product quality is improved.
(2) The increase of the content of scrap steel and the dosage of Ti alloy can make up the strength loss caused by the reduction of the content of Mn and Nb, reduce the production cost (65 yuan per ton of steel) and improve the economical efficiency.
(3) In the production process, deoxidation and alloying are carried out after converter tapping is finished, so that the N increase in the converter tapping process can be reduced; the ladle casting residue is added in the early slagging stage of a ladle refining furnace (LF furnace), so that the slagging and the desulfurization can be realized quickly, the N increasing amount in the refining process of the LF furnace is reduced, and finally the N content in molten steel is lower than 65 ppm.
(4) The pickled plate production method has the advantages of small process control difficulty, strong operability, simplicity and the like.
Detailed Description
In order to make the application purpose, technical solution and beneficial technical effects of the present application clearer, the present application is further described in detail with reference to the following embodiments. It should be understood that the embodiments described in this specification are only for the purpose of explaining the present application and are not intended to limit the present application.
For the sake of brevity, only a few numerical ranges are explicitly disclosed herein. However, any lower limit may be combined with any upper limit to form ranges not explicitly recited; and any lower limit may be combined with any other lower limit to form a range not explicitly recited, and similarly any upper limit may be combined with any other upper limit to form a range not explicitly recited. Also, although not explicitly recited, each point or individual value between endpoints of a range is encompassed within the range. Thus, each point or individual value can form a range not explicitly recited as its own lower or upper limit in combination with any other point or individual value or in combination with other lower or upper limits.
In the description herein, it is to be noted that, unless otherwise specified, "above" and "below" are inclusive, and "a plurality" of "one or more" means two or more.
The above summary of the present application is not intended to describe each disclosed embodiment or every implementation of the present application. The following description more particularly exemplifies illustrative embodiments. At various points throughout this application, guidance is provided through a list of embodiments that can be used in various combinations. In each instance, the list is merely a representative group and should not be construed as exhaustive.
The acid pickling plate has the advantages that: 1) compared with the common hot rolled plate, the acid-washing plate removes the surface iron oxide scale, improves the quality of steel, and is convenient for welding, oiling and painting; 2) the size precision is high, and the plate shape can be changed to a certain extent after the plate shape is flattened, so that the unevenness deviation is reduced; 3) the surface smoothness is improved, and the appearance effect is enhanced; 4) the environmental pollution caused by dispersed acid washing of users can be reduced; 5) on the premise of ensuring the use requirement of quality, the purchasing cost of the user is effectively reduced. However, due to the influence of chemical components and production methods, the prepared pickled plate is easy to have the problems of transverse corner cracking, segregation, sulfide inclusion and the like, and the quality and the production cost of the pickled plate are seriously influenced.
In view of the above, the present inventors have conducted extensive studies and have aimed to provide a production method capable of producing a pickled sheet having good quality, high strength and low production cost.
Production method of pickled plate
The embodiment of the first aspect of the application provides a production method of a pickled plate, which comprises the following steps:
smelting in a converter: adding molten iron and scrap steel into a converter for converter smelting to obtain molten steel; wherein the weight of the scrap steel is 25-32% based on the total weight of the molten iron and the scrap steel;
Deoxidizing and alloying: after the molten steel is discharged from the converter and transferred into a ladle refining furnace, adding an aluminum block, silicomanganese and low-carbon ferromanganese into the molten steel for deoxidation and alloying to obtain deoxidized alloyed molten steel;
ladle refining: adding ladle casting residues into the deoxidized alloying molten steel in the early slagging stage of a ladle refining furnace, and then adding high-carbon ferromanganese and ferrotitanium alloy to obtain refined molten steel; wherein the nitrogen content in the refined molten steel is less than 65 ppm;
casting blank forming: and continuously casting, hot rolling, cooling, coiling and pickling the refined molten steel to obtain a pickled plate.
The production method of the acid pickling plate provided by the embodiment of the application has the advantages of small process control difficulty, strong operability, simple method and the like, and the produced acid pickling plate is good in quality, high in strength and low in cost.
According to the embodiment of the application, in the smelting process of the converter, the weight percentage of the scrap steel is 25-32%, the production cost of the acid pickling plate can be greatly reduced, the energy consumption is saved, the yield is improved, meanwhile, the chemical components of the molten steel can be adjusted by adding the scrap steel, and the tensile strength of the acid pickling plate is improved. When the weight ratio of the scrap steel is lower than 25%, the production cost of the pickled plate is not reduced; when the weight ratio of the scrap steel is higher than 32%, the control of the N content in the molten steel is not facilitated.
According to the embodiment of the application, the molten steel is discharged from the converter and transferred into the LF furnace, and then deoxidation and alloying are carried out, so that the N increase in the converter discharging process can be reduced, and the crack sensitivity of the corner of the casting blank is reduced. In the tapping process, the molten steel is completely exposed and directly contacts with the atmosphere, oxygen is used as a surface active element to block the nitrogen absorption of the molten steel, and if a deoxidizing substance is added in the tapping process, the oxygen content in the molten steel is reduced, and the nitrogen absorption amount of the molten steel is correspondingly increased. After the molten steel is transferred into the LF furnace, the contact area between the molten steel and air is reduced, and then deoxidation treatment is carried out, so that the corresponding nitrogen absorption amount of the molten steel is low, and the low nitrogen content in the molten steel has important significance for improving the quality and the strength of the acid-pickled plate.
According to the embodiment of the application, the steel ladle casting residue is composed of casting steel slag, residual molten steel and a small amount of covering agent, has good reducibility, strong fluidity, high temperature and good uniformity, is beneficial to rapid slagging, reduces secondary oxidation of the molten steel, and has strong desulfurization capability. In the ladle refining process, ladle casting residues are added into deoxidized and alloyed molten steel, so that slag can be rapidly formed and desulfurized, the N increase amount in the LF furnace refining process is reduced, the nitrogen content in the refined molten steel is lower than 65ppm, the stability of strength is ensured, the crack incidence rate is reduced, and the quality of a pickling plate is improved.
In some embodiments, in the continuous casting process, a covering agent is reasonably added to ensure that molten steel is not exposed, so that the argon back pressure of the long nozzle is greater than 0 MPa.
In some examples, according to the examples of the present application, the volume of scrap added to the converter during the converter smelting step is less than 1m3。
According to the embodiment of the application, the volume of the scrap steel can be fully melted and utilized in the converter smelting process, and if the volume of the scrap steel is more than 1m3The utilization rate of the scrap steel is low, N is increased in the smelting process, and the quality of the pickled plate is not improved.
In some embodiments, in the deoxidation alloying step, the molten steel is tapped from the converter to a red-pack tap, the temperature of the inner wall of the steel pack being > 800 ℃.
According to the embodiment of the application, the red-packet steel tapping can reduce the temperature drop during steel tapping, so that the steel tapping temperature is reduced, the waste steel consumption is increased, and the furnace life is prolonged.
In some embodiments, an aluminum block is added to the molten steel in an amount of 1.1 to 1.5kg based on the weight of 1 ton of the molten steel in the deoxidation alloying step.
According to the embodiment of the application, after tapping is finished, the alloy is added, and the aluminum blocks-silicomanganese-low-carbon ferromanganese are added according to the sequence of weak first and strong second to ensure good deoxidation effect. The reduction in the solubility of oxygen in the steel, due to the temperature drop during tapping, leads to the escape of oxygen, which in addition reacts with carbon carried in by the carbon and alloy in the steel to form CO and CO 2The impurities are removed, and other impurity gases dissolved in the molten steel are removed, thereby improving the quality of the molten steel.
In some embodiments, the silicon and manganese are added into the molten steel, the addition amount of the silicon and manganese is 2.2-2.6 kg based on the weight of 1 ton of the molten steel, and the nitrogen content of the silicon and manganese is 40 +/-15 ppm.
In some embodiments, low-carbon ferromanganese is added to the molten steel in an amount of 1.2 to 1.6kg based on 1 ton of the molten steel, and the nitrogen content of the low-carbon ferromanganese is 120 ± 30 ppm.
According to the embodiment of the application, in the deoxidation alloying process, based on the weight of 1 ton of molten steel, the addition amounts of the aluminum blocks, the silicon manganese and the low-carbon ferromanganese can meet the requirements of deoxidation and removal of oxidation products and impurities, and meanwhile, the molten steel can be ensured not to adsorb excessive nitrogen in the process, so that the purity of the molten steel is improved to the maximum extent, and the quality and the strength of the obtained pickled plate are good.
In some embodiments, ladle casting residues are added to the deoxidized alloyed molten steel in the ladle refining step, wherein the ladle casting residues are selected from casting residues of low sulfur steel species.
In some embodiments, the sulfur content of the low sulfur steel grade is less than 0.008%.
According to the embodiment of the application, the ladle casting residue is added into the deoxidized alloying molten steel, so that the slagging can be completed quickly, the slag has certain alkalinity, the sulfur impurities in the metal can be removed as soon as possible, the secondary oxidation is reduced, and the requirement of strengthening smelting is met; meanwhile, molten steel splashing can be avoided, metal loss is reduced, and the service life of the furnace lining is prolonged. The ladle casting residue (the sulfur content is lower than 0.008%) of low-sulfur steel is selected, so that the introduction of redundant sulfur into molten steel can be reduced, and the adverse effect of sulfide inclusions on the molten steel is avoided.
In some embodiments, in the step of casting, the chemical composition of the pickled plate comprises, in weight percent: c: 0.04-0.065%, less than or equal to 0.1% of Si, Mn: 0.4-1.0%, P is less than or equal to 0.02%, S is less than or equal to 0.006%, Ti: 0.01-0.06%, Nb less than or equal to 0.03%, and the balance of Fe and inevitable impurities.
According to the embodiment of the application, the use amount of Mn and Nb in the pickled plate is reduced, the content of harmful substance niobium carbonitride can be reduced, the crack sensitivity of the pickled plate in the continuous casting production process is further reduced, and the product quality is improved.
According to the embodiment of the application, the using amount of Ti is increased, wherein the Ti can be combined with nitrogen and carbon to form stable nitride and carbide, so that austenite grains are prevented from growing to improve the welding performance of the material; when the titanium content is higher (more than 0.04%), dispersed and fine titanium carbide can be formed by combining the hot working process, and the precipitation strengthening effect is achieved; meanwhile, titanium has a certain fine-grain strengthening effect. Therefore, the high-titanium process design can realize the production of the pickled plate with low cost and high quality.
In some embodiments, in the step of casting, the chemical composition of the pickled plate comprises, in weight percent: c: 0.05%, Si: 0.06%, Mn: 0.55%, P: 0.015%, S: 0.004%, Ti: 0.05%, Nb: 0.013% and the balance Fe and unavoidable impurities.
According to the embodiment of the application, the pickled plate with excellent quality, high strength and low production cost can be prepared by improving the chemical components and the production process of the pickled plate.
Examples
The present disclosure is more particularly described in the following examples that are intended as illustrative only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the following examples are on a weight basis, and all reagents used in the examples are commercially available or synthesized according to conventional methods and can be used directly without further treatment, and the equipment used in the examples is commercially available.
Example 1
The embodiment provides a production method of a pickled plate, which specifically comprises the following steps:
(1) The target components of the pickled plate are as follows: c: 0.05%, Si: 0.06%, Mn: 0.45%, P: 0.015%, S: 0.004%, Ti: 0.045% and the balance Fe and unavoidable impurities;
(2) smelting by adopting a 100t converter, adding molten iron and scrap steel into the converter, wherein the adding amount of the molten iron is 80 tons per furnace, the adding amount of the scrap steel is 35 tons per furnace, the total loading amount is 115 tons per furnace, the scrap steel ratio is 30 percent, and the added scrap steel has the bulk size of less than 1m3The end point carbon content of the converter smelting process is 0.035%, and the end point temperature is 1620 +/-10 ℃;
(3) adding an aluminum block for deoxidation after tapping, wherein the addition amount is 1.3kg/t steel, the manganese alloy is low-carbon ferromanganese and silicomanganese (the N content is 120 +/-30 ppm and 40 +/-15 ppm respectively), the addition amount is 1.4 kg/ton steel and 2.4 kg/ton steel respectively, and the nitrogen increase amount in the deoxidation alloying process is 8 ppm;
(4) in the early stage of slagging of the ladle refining furnace, adding ladle casting residues into deoxidized and alloyed molten steel, and rapidly slagging and desulfurizing; adding high manganese and ferrotitanium to adjust to target components, wherein the nitrogen increasing amount in the ladle refining process is 12ppm, and the nitrogen content in refined molten steel is lower than 65 ppm;
(5) and continuously casting, hot rolling, cooling, coiling and pickling the refined molten steel to obtain a pickled plate.
Example 2
The embodiment provides a production method of a pickled plate, which specifically comprises the following steps:
(1) the target components of the pickled plate are as follows: c: 0.05%, Si: 0.06%, Mn: 0.55%, P: 0.015%, S: 0.004%, Ti: 0.05%, Nb: 0.013% and the balance Fe and inevitable impurities;
(2) smelting by adopting a 100t converter, adding molten iron and scrap steel into the converter, wherein the adding amount of the molten iron is 80 tons per furnace, the adding amount of the scrap steel is 35 tons per furnace, the total loading amount is 115 tons per furnace, the scrap steel ratio is 30 percent, and the added scrap steel has the bulk size of less than 1m3The end point carbon content of the converter smelting process is 0.035%, and the end point temperature is 1620 +/-10 ℃;
(3) adding an aluminum block for deoxidation after tapping, wherein the addition amount is 1.3kg/t steel, the manganese alloy is low-carbon ferromanganese and silicomanganese (the N content is 120 +/-30 ppm and 40 +/-15 ppm respectively), the addition amount is 2.4 kg/ton steel and 2.4 kg/ton steel respectively, and the nitrogen increase amount in the converter tapping process is 8 ppm;
(4) in the early stage of slagging of the ladle refining furnace, adding ladle casting residues into deoxidized and alloyed molten steel, and rapidly slagging and desulfurizing; adding high manganese, ferrotitanium and ferroniobium to adjust to target components. The nitrogen increasing amount of the LF furnace is 12ppm, and the nitrogen content in refined molten steel is lower than 65 ppm.
(5) And continuously casting, hot rolling, cooling, coiling and pickling the refined molten steel to obtain a pickled plate.
Comparative example
Comparative example 1
The present comparative example provides a method for producing pickled plates, specifically as follows:
(1) the target components of the pickled plate are as follows: c: 0.05%, Si: 0.06%, Mn: 0.45%, P: 0.015%, S: 0.004%, Ti: 0.045% and the balance Fe and unavoidable impurities;
(2) smelting by adopting a 100t converter, adding molten iron and scrap steel into the converter, wherein the adding amount of the molten iron is 80 tons per furnace, the adding amount of the scrap steel is 35 tons per furnace, the total loading amount is 115 tons per furnace, the scrap steel ratio is 30 percent, and the added scrap steel has the bulk size of less than 1m3The end point carbon content of the converter smelting process is 0.035%, and the end point temperature is 1620 +/-10 ℃;
(3) adding aluminum blocks for deoxidation in the tapping process, wherein the addition amount is 1.3kg/t steel, the manganese alloy is low-carbon ferromanganese and silicomanganese (the N content is 120 +/-30 ppm and 40 +/-15 ppm respectively), the addition amount is 2.4 kg/ton steel and 2.4 kg/ton steel respectively, and the nitrogen increase amount in the converter tapping process is 25 ppm;
(4) in the slagging process of the ladle refining furnace, lime, slag charge containing Al and the like are added into deoxidized and alloyed molten steel for slagging and desulfurization; adding high manganese, ferrotitanium and ferroniobium to adjust to target components. The nitrogen increasing amount of the LF furnace is 20ppm, and the nitrogen content in refined molten steel is lower than 80 ppm.
(5) And continuously casting, hot rolling, cooling, coiling and pickling the refined molten steel to obtain a pickled plate.
Comparative example 2
The present comparative example provides a method for producing pickled plates, specifically as follows:
(1) the target components of the pickled plate are as follows: c: 0.05%, Si: 0.06%, Mn: 0.3%, P: 0.015%, S: 0.004%, Ti: 0.008%, Nb: 0.04% and the balance Fe and unavoidable impurities;
(2) smelting by adopting a 100t converter, adding molten iron and scrap steel into the converter, wherein the adding amount of the molten iron is 80 tons per furnace, the adding amount of the scrap steel is 35 tons per furnace, the total loading amount is 115 tons per furnace, the scrap steel ratio is 30 percent, and the added scrap steel has the bulk size of less than 1m3The end point carbon content of the converter smelting process is 0.035%, and the end point temperature is 1620 +/-10 ℃;
(3) adding aluminum blocks for deoxidation in the tapping process, wherein the addition amount is 1.3kg/t steel, the manganese alloy is low-carbon ferromanganese and silicomanganese (the N content is 120 +/-30 ppm and 40 +/-15 ppm respectively), the addition amount is 1.4 kg/ton steel and 2.4 kg/ton steel respectively, and the nitrogen increase amount in the deoxidation alloying process is 15 ppm;
(4) in the slagging process of the ladle refining furnace, lime, slag charge containing Al and the like are added into deoxidized and alloyed molten steel for slagging and desulfurization; adding high manganese and ferrotitanium to adjust to target components, wherein the nitrogen increasing amount in the ladle refining process is 15ppm, and the nitrogen content in refined molten steel is higher than 75 ppm;
(5) and continuously casting, hot rolling, cooling, coiling and pickling the refined molten steel to obtain a pickled plate.
Test section
The physical and chemical properties of the pickled plates prepared in the examples 1-2 and the comparative examples 1-2 were tested, and the specific test method was as follows:
internal quality (inclusion rating): GB/T10561-.
Strength, elongation: GB/T228.1-2010 metallic Material tensile test part 1 is adopted: room temperature test methods.
The results of the test of the physical properties of the pickled plates prepared in examples 1 to 2 and comparative examples 1 to 2 are shown in Table 1.
TABLE 1 pickled plate physical and chemical property test results
As can be seen from the results of the physicochemical properties of the pickled plates in the table 1, the pickled plates of the examples 1-2 have no transverse folding defect, good inclusion rating, and excellent tensile strength, yield strength and elongation. Comparative example 1 is different from example 1 in that the time for performing deoxidation alloying is different and no ladle casting residue is used in slagging, thus resulting in a higher nitrogen increase (higher than 80ppm) in the molten steel in comparative example 1, a decrease in strength of the resulting pickled sheet, and a deterioration in inclusion rating. Comparative example 2 is different from example 1 in that the contents of Mn, Ti and Nb are out of the ranges described in the present application and in that ladle casting residue is not used in slagging unlike example 1 in the time of deoxidation alloying, so that the pickled sheet has a high crack generation rate, low strength and elongation, and poor inclusion rating.
In conclusion, the chemical components and the production process of the pickled plate are improved, and the prepared pickled plate is excellent in quality, high in strength and low in production cost.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A production method of a pickled plate, characterized by comprising:
smelting in a converter: adding molten iron and scrap steel into a converter for converter smelting to obtain molten steel; wherein the weight proportion of the scrap steel is 25-32% based on the total weight of the molten iron and the scrap steel;
deoxidizing and alloying: tapping the molten steel from the converter and transferring the molten steel into a ladle refining furnace, and then adding an aluminum block, silicomanganese and low-carbon ferromanganese into the molten steel for deoxidation and alloying to obtain deoxidized alloying molten steel;
ladle refining: adding ladle casting residues into the deoxidized alloying molten steel in the early slagging stage of a ladle refining furnace, and then adding high-carbon ferromanganese and ferrotitanium alloy to obtain refined molten steel; wherein the nitrogen content in the refined molten steel is less than 65 ppm;
Casting blank forming: and continuously casting, hot rolling, cooling, coiling and pickling the refined molten steel to obtain a pickled plate.
2. The process for producing pickled plates as defined in claim 1, wherein said scrap feeding step is carried out in a converter with a volume of less than 1m3。
3. The pickled plate production method as claimed in claim 1, wherein the molten steel is tapped from the converter to a red-covered steel in the deoxidation alloying step, and the temperature of the inner wall of the steel-covered steel is greater than 800 ℃.
4. The pickled plate production method as defined in claim 1, wherein the aluminum nuggets are added to the molten steel in the deoxidation alloying step in an amount of 1.1 to 1.5kg based on 1 ton of the molten steel.
5. The pickled plate production method as defined in claim 1, wherein in the deoxidation alloying step, silicomanganese is added to the molten steel in an amount of 2.2 to 2.6kg based on 1 ton of the molten steel, and the nitrogen content of silicomanganese is 40 ± 15 ppm.
6. The pickled plate production method as claimed in claim 1, wherein in the deoxidation alloying step, the low-carbon ferromanganese is added to the molten steel in an amount of 1.2 to 1.6kg based on 1 ton of the molten steel, and the nitrogen content of the low-carbon ferromanganese is 120 ± 30 ppm.
7. The pickled plate production method as claimed in claim 1, wherein the ladle casting residue is added to the deoxidized alloyed molten steel in the ladle refining step, and the ladle casting residue is selected from casting residues of low-sulfur steel species.
8. The pickled sheet production method as claimed in claim 7, wherein the low sulfur steel grade has a sulfur content of less than 0.008%.
9. The pickled plate production method as claimed in claim 1, wherein in the step of casting, the pickled plate comprises the following chemical components in percentage by weight: c: 0.04-0.065%, Si is less than or equal to 0.1%, Mn: 0.4-1.0%, P is less than or equal to 0.02%, S is less than or equal to 0.006%, Ti: 0.01-0.06%, Nb less than or equal to 0.03%, and the balance of Fe and inevitable impurities.
10. The pickled plate production method as claimed in claim 9, wherein the pickled plate comprises the following chemical components in percentage by weight in the step of casting: c: 0.05%, Si: 0.06%, Mn: 0.55%, P: 0.015%, S: 0.004%, Ti: 0.05%, Nb: 0.013% and the balance Fe and unavoidable impurities.
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