CN114752725B - Pickle sheet and production method thereof - Google Patents
Pickle sheet and production method thereof Download PDFInfo
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- CN114752725B CN114752725B CN202210341622.5A CN202210341622A CN114752725B CN 114752725 B CN114752725 B CN 114752725B CN 202210341622 A CN202210341622 A CN 202210341622A CN 114752725 B CN114752725 B CN 114752725B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 47
- 235000021110 pickles Nutrition 0.000 title description 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 165
- 239000010959 steel Substances 0.000 claims abstract description 165
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000005266 casting Methods 0.000 claims abstract description 33
- 238000005554 pickling Methods 0.000 claims abstract description 29
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 27
- 238000007670 refining Methods 0.000 claims abstract description 24
- 238000003723 Smelting Methods 0.000 claims abstract description 22
- 238000010079 rubber tapping Methods 0.000 claims abstract description 21
- 229910000616 Ferromanganese Inorganic materials 0.000 claims abstract description 20
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 19
- 229910052742 iron Inorganic materials 0.000 claims abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000009749 continuous casting Methods 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 10
- 239000000956 alloy Substances 0.000 claims abstract description 10
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims abstract description 8
- 230000015572 biosynthetic process Effects 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
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 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
- 238000005275 alloying Methods 0.000 claims description 20
- 239000000126 substance Substances 0.000 claims description 18
- 239000012535 impurity Substances 0.000 claims description 13
- 239000011593 sulfur Substances 0.000 claims description 13
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 10
- 229910052758 niobium Inorganic materials 0.000 claims description 9
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 3
- 238000004886 process control Methods 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 229910000914 Mn alloy Inorganic materials 0.000 description 8
- 239000010955 niobium Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 229910052748 manganese Inorganic materials 0.000 description 6
- 239000011572 manganese Substances 0.000 description 6
- 239000010936 titanium Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 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
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 239000000203 mixture Substances 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
- 229910052719 titanium Inorganic materials 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
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007423 decrease Effects 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
- 238000005204 segregation Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method 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
- 239000013078 crystal Substances 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
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process 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
- 239000000463 material Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 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
- 238000009966 trimming Methods 0.000 description 1
- 238000005406 washing Methods 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 pickling 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 to perform converter smelting to obtain molten steel; tapping the molten steel from a converter and transferring the molten steel into a ladle refining furnace, and adding aluminum blocks, silicon manganese and low-carbon ferromanganese into the molten steel to deoxidize and alloy the molten steel to obtain deoxidized and alloyed molten steel; adding ladle casting residue into the deoxidized alloyed molten steel in the early stage of slag formation of a ladle refining furnace, and then adding high-carbon ferromanganese and ferrotitanium alloy to obtain refined molten steel; and carrying out continuous casting, hot rolling, cooling, coiling and pickling on the refined molten steel to obtain a pickled plate. The production method of the pickled plate provided by the application has the advantages of low process control difficulty, strong operability, simple method, good quality, high tensile strength and low production cost of the prepared pickled plate.
Description
Technical Field
The application belongs to the technical field of pickled plate manufacturing, and particularly relates to a pickled plate and a production method thereof.
Background
The pickling plate is an intermediate product with quality and use requirements between a hot rolled plate and a cold rolled plate after oxide layers are removed by a pickling line, trimming and finishing, is an ideal substitute product for 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, the steel factories at home and abroad mostly adopt carbon-manganese-niobium-titanium components for synthesizing pickling plates, so that on one hand, the cost is too high, the market competitiveness is poor, and the performance of the steel factories is seriously affected; on the other hand, due to the influences of component composition and production process, the cracking tendency is high in the continuous casting production process, the problems of transverse angle cracking, segregation, high sulfide inclusion grade and the like are easy to occur at the corners of a casting blank, and the quality and strength of the pickled plate are seriously influenced.
Disclosure of Invention
The application provides a pickling plate and a production method thereof, and aims to solve the problems of poor quality, lower strength and high production cost of the pickling 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 to perform converter smelting to obtain molten steel; wherein, based on the total weight of molten iron and scrap steel, the weight ratio of scrap steel is 25-32%;
deoxidizing and alloying: tapping molten steel from a converter and transferring the molten steel into a ladle refining furnace, and adding aluminum blocks, silicon manganese and low-carbon ferromanganese into the molten steel to deoxidize and alloy the molten steel to obtain deoxidized and alloyed molten steel;
ladle refining: adding ladle casting residue into deoxidized alloyed molten steel in the early stage of ladle refining furnace slag formation, 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 65ppm;
and (3) casting blank molding: and carrying out continuous casting, hot rolling, cooling, coiling and pickling on the refined molten steel to obtain a pickled plate.
According to an embodiment of one aspect of the application, in the converter smelting step, the scrap is added to the converter in a scrap volume of less than 1m 3 。
According to an embodiment of one aspect of the present application, in the deoxidizing alloying step, the molten steel is tapped from the converter into a red-ladle tap, and the ladle inner wall temperature is > 800 ℃.
According to an embodiment of one aspect of the present application, in the deoxidizing alloying step, aluminum nuggets are added to the molten steel in an amount of 1.1 to 1.5kg based on a weight of 1 ton of the molten steel.
According to an embodiment of an aspect of the present application, in the deoxidizing alloying step, silicomanganese is added to the molten steel in an amount of 2.2 to 2.6kg based on a weight of 1 ton of the molten steel, and nitrogen content of the silicomanganese is 40.+ -. 15ppm.
According to an embodiment of an aspect of the present application, in the deoxidizing alloying step, low carbon ferromanganese is added to the molten steel in an amount of 1.2 to 1.6kg based on the weight of 1 ton of molten steel, and the nitrogen content of the low carbon ferromanganese is 120.+ -. 30ppm.
According to an embodiment of one aspect of the present application, in the ladle refining step, ladle casting residues are added to the deoxidized alloyed molten steel, wherein the ladle casting residues are selected from casting residues of low sulfur steel grades.
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 present application, in the casting blank forming step, the acid-washed plate comprises the chemical components in weight percent: c:0.04-0.065%, si 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 to 0.06 percent, less than or equal to 0.03 percent of Nb, and the balance of Fe and unavoidable impurities.
According to an embodiment of one aspect of the present application, in the casting blank forming step, the acid-washed plate comprises the chemical components 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 of Fe and unavoidable impurities.
Compared with the prior art, the application has at least the following beneficial effects:
the application improves the chemical components and the production process of the pickled plate, the prepared pickled plate has good quality, no crack and skin tilting phenomenon, high tensile strength and low production cost.
(1) The Mn and Nb consumption in the pickling plate is reduced, the content of harmful substances niobium carbonitride can be reduced, the crack sensitivity of the pickling plate in the continuous casting production process is further reduced, and the quality of products is improved.
(2) The strength loss caused by the reduction of the Mn and Nb contents can be compensated by increasing the content of the scrap steel and the consumption of the Ti alloy, the production cost (65 yuan for ton steel) is reduced, and the economical efficiency is improved.
(3) In the production process, deoxidization and alloying are carried out after the tapping of the converter is finished, so that the N increment in the tapping process of the converter can be reduced; the ladle casting residue is added in the ladle refining furnace (LF furnace) in the early stage of slagging, so that slag can be formed and desulfurized quickly, the N increment in the LF furnace refining process is reduced, and finally the N content in molten steel is lower than 65ppm.
(4) The production method of the pickled plate has the advantages of small process control difficulty, strong operability, simple method and the like.
Detailed Description
In order to make the application object, technical scheme and beneficial technical effects of the application clearer, the application is further described in detail with reference to the following embodiments. It should be understood that the examples described in this specification are for the purpose of illustrating the application only and are not intended to limit the application.
For simplicity, only a few numerical ranges are explicitly disclosed herein. However, any lower limit may be combined with any upper limit to form a range not explicitly recited; and any lower limit may be combined with any other lower limit to form a range not explicitly recited, and any upper limit may be combined with any other upper limit to form a range not explicitly recited. Furthermore, each point or individual value between the endpoints of the range is included within the range, although not explicitly recited. Thus, each point or individual value may be combined as a lower or upper limit on itself with any other point or individual value or with other lower or upper limit to form a range that is not explicitly recited.
In the description herein, unless otherwise indicated, "above" and "below" are intended to include the present number, and the meaning of "multiple" in "one or more" is 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. Guidance is provided throughout this application by a series of embodiments, which may be used in various combinations. In the various examples, the list is merely a representative group and should not be construed as exhaustive.
The pickling plate has the advantages that: 1) Compared with a common hot rolled plate, the pickled plate removes surface iron scales, improves the quality of steel, and is convenient for welding, oiling and painting; 2) The dimensional accuracy is high, and the plate shape can be changed to a certain extent after the plate is leveled, so that the deviation of unevenness is reduced; 3) The surface smoothness is improved, and the appearance effect is enhanced; 4) The environmental pollution caused by the scattered acid washing of users can be reduced; 5) On the premise of ensuring the quality using requirement, the purchasing cost of the user is effectively reduced. However, due to the influence of chemical components and a production method, the prepared pickled plate is easy to suffer from problems of transverse angle cracking, segregation, sulfide inclusion and the like, and the quality and the production cost of the pickled plate are seriously influenced.
In view of this, the inventors have made extensive studies with a view to providing a production method capable of producing a pickled plate having good quality, high strength and low production cost.
Production method of pickled plate
An embodiment of a first aspect of the present application provides a method for producing a pickled plate, the method comprising:
smelting in a converter: adding molten iron and scrap steel into a converter to perform converter smelting to obtain molten steel; wherein the weight ratio 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 a converter and transferring the molten steel into a ladle refining furnace, and adding aluminum blocks, silicon manganese and low-carbon ferromanganese into the molten steel to deoxidize and alloy the molten steel to obtain deoxidized and alloyed molten steel;
ladle refining: adding ladle casting residue into the deoxidized alloyed molten steel in the early stage of slag formation 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 65ppm;
and (3) casting blank molding: and carrying out continuous casting, hot rolling, cooling, coiling and pickling on the refined molten steel to obtain a pickled plate.
The production method of the pickled 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 pickled plate has good quality, high strength and low cost.
According to the embodiment of the application, in the converter smelting process, the weight ratio of the scrap steel is 25-32%, so that the production cost of the pickling plate can be greatly reduced, the energy consumption is saved, the yield is improved, and meanwhile, the chemical components of molten steel can be adjusted by adding the scrap steel, and the tensile strength of the pickling plate is improved. When the weight ratio of the scrap steel is lower than 25%, the production cost of the pickling 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, molten steel is tapped from the converter and transferred into the LF furnace for deoxidation and alloying, and the operation can reduce the N increment in the tapping process of the converter and reduce the crack sensitivity of the corner of a casting blank. In the tapping process, molten steel is completely exposed and is in direct contact with the atmosphere, oxygen is taken as a surface active element to prevent nitrogen absorption of the molten steel, and if deoxidizing substances are 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 molten steel is transferred into an LF furnace, the contact area between the molten steel and air is reduced, and 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 strength of the pickling plate.
According to the embodiment of the application, the ladle casting residue consists of the casting 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 slag formation, reduces secondary oxidation of the molten steel, and has stronger desulfurization capability. In the ladle refining process, ladle casting residues are added into the deoxidized alloyed molten steel, so that slag can be rapidly formed and desulfurized, the N increment in the LF refining process is reduced, the nitrogen content in the refined molten steel is lower than 65ppm, the stability of the strength is ensured, the crack occurrence rate is reduced, and the quality of the pickled plate is improved.
In some embodiments, during 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 more than 0MPa.
In some embodiments, according to embodiments of the present application, in the converter smelting step, the volume of scrap added to the converter is less than 1m 3 。
According to the embodiment of the application, the scrap steel with the volume can be fully melted and utilized in the converter smelting process, if the volume of the scrap steel is more than 1m 3 The utilization rate of the scrap steel is low, and N is increased in the smelting process, so that the quality of the pickled plate is not improved.
In some embodiments, in the deoxidizing alloying step, the molten steel is tapped from the converter as red-ladle tapping, with ladle inner wall temperatures > 800 ℃.
According to the embodiment of the application, the temperature drop during tapping can be reduced during tapping, so that the tapping temperature is reduced, the amount of scrap steel is increased, and the furnace life is improved.
In some embodiments, in the deoxidizing alloying step, aluminum nuggets are added to the molten steel in an amount of 1.1 to 1.5kg based on a weight of 1 ton of molten steel.
According to the embodiment of the application, the alloy is added after tapping, and aluminum blocks, silicon manganese and low-carbon ferromanganese are added in the order of weakness before strength so as to ensure good deoxidizing effect. Due to the temperature drop during tapping, the solubility of oxygen in the molten steel decreases, which leads to oxygen evolution and, in additionReacts with carbon in molten steel and carbon carried by alloy to form CO and CO 2 The molten steel can be effectively purified by escaping, and impurities and other impurity gases dissolved in the molten steel are removed, so that the quality of the molten steel is improved.
In some embodiments, the silicon manganese is added to the molten steel in an amount of 2.2 to 2.6kg based on a weight of 1 ton of molten steel, and the nitrogen content of the silicon manganese is 40.+ -. 15ppm.
In some embodiments, low carbon ferromanganese is added to the molten steel in an amount of 1.2 to 1.6kg based on the weight of 1 ton of molten steel, and the nitrogen content of the low carbon ferromanganese is 120.+ -. 30ppm.
According to the embodiment of the application, in the deoxidizing and alloying process, based on the weight of 1 ton of molten steel, the addition amount of the aluminum block, the silicon manganese and the low-carbon ferromanganese can meet the requirements of deoxidizing and removing oxidation products and inclusions, 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 greatest extent, and the quality and the strength of the obtained pickled plate are ensured to be good.
In some embodiments, ladle casting residues are added to the deoxidized alloyed molten steel in a ladle refining step, wherein the ladle casting residues are selected from casting residues of low sulfur steel grades.
In some embodiments, the sulfur content of the low sulfur steel grade is less than 0.008%.
According to the embodiment of the application, ladle casting residues are added into deoxidized and alloyed molten steel, so that slag formation can be completed rapidly, and the slag has a certain alkalinity, so that sulfur impurities in metal can be removed as soon as possible, secondary oxidation is reduced, and the requirement of enhanced smelting is met; meanwhile, molten steel splashing can be avoided, metal loss is reduced, and the service life of a furnace lining is prolonged. The ladle casting residue (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 inclusion on the molten steel is avoided.
In some embodiments, in the casting blank forming step, the chemical composition of the pickled plate comprises, in weight percent: c:0.04-0.065%, si 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 to 0.06 percent, less than or equal to 0.03 percent of Nb, and the balance of Fe and unavoidable impurities.
According to the embodiment of the application, the consumption of Mn and Nb in the pickling plate is reduced, the content of harmful substances niobium carbonitride can be reduced, the crack sensitivity of the pickling plate in the continuous casting production process is further reduced, and the quality of products is improved.
According to the embodiment of the application, the use amount of Ti is increased, wherein the Ti can be combined with nitrogen and carbon to form stable nitrides and carbides, and austenite grains are prevented from growing, so that the welding performance of the material is improved; when the titanium content is higher (more than 0.04 percent), the titanium carbide with fine dispersion can be formed by combining a hot processing technology, and the precipitation strengthening effect is achieved; meanwhile, titanium has a certain fine crystal strengthening effect. Therefore, the high titanium process design can be adopted to realize the production of the pickled plate with low cost and high quality.
In some embodiments, in the casting blank forming step, 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 of Fe and unavoidable impurities.
According to the embodiment of the application, the acid-washed plate with excellent quality, high strength and low production cost can be prepared by improving the chemical components and the production process of the acid-washed plate.
Examples
The present disclosure is more particularly described in the following examples that are intended as illustrations 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 examples below are by weight, and all reagents used in the examples are commercially available or were obtained synthetically according to conventional methods and can be used directly without further treatment, as well as the instruments used in the examples.
Example 1
The embodiment provides a production method of a pickling plate, which comprises the following steps:
(1) The pickling plate comprises the following target components: c:0.05%, si:0.06%, mn:0.45%, P:0.015%, S:0.004%, ti:0.045% Fe and the balance of 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/furnace, the adding amount of the scrap steel is 35 tons/furnace, the total adding amount is 115 tons/furnace, the scrap steel ratio is 30%, and the added scrap steel has the block size less than 1m 3 The carbon content of the end point of the converter smelting process is 0.035%, and the temperature of the end point is 1620+/-10 ℃;
(3) Adding aluminum blocks to deoxidize after tapping, wherein the addition amount is 1.3kg/t of steel, the manganese alloy is low-carbon ferromanganese and silicomanganese (the N content of the manganese alloy is 120+/-30 ppm and 40+/-15 ppm respectively), the addition amount is 1.4 kg/ton of steel and 2.4 kg/ton of steel respectively, and the nitrogen increment amount in the deoxidizing alloying process is 8ppm;
(4) In the early stage of ladle refining furnace slagging, adding ladle casting residue into deoxidized alloyed molten steel, and rapidly slagging and desulfurizing; adding high manganese and ferrotitanium to adjust the target components, wherein the nitrogen increment of the ladle refining process is 12ppm, and the nitrogen content in refined molten steel is lower than 65ppm;
(5) And carrying out continuous casting, hot rolling, cooling, coiling and pickling on the refined molten steel to obtain a pickled plate.
Example 2
The embodiment provides a production method of a pickling plate, which comprises the following steps:
(1) The pickling plate comprises the following target components: c:0.05%, si:0.06%, mn:0.55%, P:0.015%, S:0.004%, ti:0.05%, nb:0.013% and the balance of 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/furnace, the adding amount of the scrap steel is 35 tons/furnace, the total adding amount is 115 tons/furnace, the scrap steel ratio is 30%, and the added scrap steel has the block size less than 1m 3 The carbon content of the end point of the converter smelting process is 0.035%, and the temperature of the end point is 1620+/-10 ℃;
(3) Adding aluminum blocks for deoxidization after tapping, wherein the addition amount is 1.3kg/t of steel, the manganese alloy is low-carbon ferromanganese and silicomanganese (the N content of the manganese alloy is 120+/-30 ppm and 40+/-15 ppm respectively), the addition amount is 2.4 kg/ton of steel and 2.4 kg/ton of steel respectively, and the nitrogen increment amount in the converter tapping process is 8ppm;
(4) In the early stage of ladle refining furnace slagging, adding ladle casting residue into deoxidized alloyed molten steel, and rapidly slagging and desulfurizing; adding high manganese, ferrotitanium and ferroniobium to adjust to target components. The nitrogen increment of the LF furnace is 12ppm, and the nitrogen content in refined molten steel is lower than 65ppm.
(5) And carrying out continuous casting, hot rolling, cooling, coiling and pickling on the refined molten steel to obtain a pickled plate.
Comparative example
Comparative example 1
The comparative example provides a production method of a pickled plate, which comprises the following steps:
(1) The pickling plate comprises the following target components: c:0.05%, si:0.06%, mn:0.45%, P:0.015%, S:0.004%, ti:0.045% Fe and the balance of 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/furnace, the adding amount of the scrap steel is 35 tons/furnace, the total adding amount is 115 tons/furnace, the scrap steel ratio is 30%, and the added scrap steel has the block size less than 1m 3 The carbon content of the end point of the converter smelting process is 0.035%, and the temperature of the end point is 1620+/-10 ℃;
(3) Adding aluminum blocks to deoxidize in the tapping process, wherein the adding amount is 1.3kg/t of steel, the manganese alloy is low-carbon ferromanganese and silicomanganese (the N content of the manganese alloy is 120+/-30 ppm and 40+/-15 ppm respectively), the adding amount is 2.4 kg/ton of steel and 2.4 kg/ton of steel respectively, and the nitrogen increment in the tapping process of the converter is 25ppm;
(4) In the slag making process of the ladle refining furnace, lime, al-containing slag and the like are added into the deoxidized alloyed molten steel, and slag making and desulfurization are carried out; adding high manganese, ferrotitanium and ferroniobium to adjust to target components. The nitrogen increment of the LF furnace is 20ppm, and the nitrogen content in refined molten steel is lower than 80ppm.
(5) And carrying out continuous casting, hot rolling, cooling, coiling and pickling on the refined molten steel to obtain a pickled plate.
Comparative example 2
The comparative example provides a production method of a pickled plate, which comprises the following steps:
(1) The pickling plate comprises the following target components: c:0.05%, si:0.06%, mn:0.3%, P:0.015%, S:0.004%, ti:0.008%, nb:0.04% and the balance of 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/furnace, the adding amount of the scrap steel is 35 tons/furnace, the total adding amount is 115 tons/furnace, the scrap steel ratio is 30%, and the added scrap steel has the block size less than 1m 3 The carbon content of the end point of the converter smelting process is 0.035%, and the temperature of the end point is 1620+/-10 ℃;
(3) Adding aluminum blocks to deoxidize in the tapping process, wherein the addition amount is 1.3kg/t of steel, the manganese alloy is low-carbon ferromanganese and silicomanganese (the N content of the manganese alloy is 120+/-30 ppm and 40+/-15 ppm respectively), the addition amount is 1.4 kg/ton of steel and 2.4 kg/ton of steel respectively, and the nitrogen increment amount in the deoxidizing alloying process is 15ppm;
(4) In the slag making process of the ladle refining furnace, lime, al-containing slag and the like are added into the deoxidized alloyed molten steel, and slag making and desulfurization are carried out; adding high manganese and ferrotitanium to adjust the target components, wherein the nitrogen increment of the ladle refining process is 15ppm, and the nitrogen content in refined molten steel is higher than 75ppm;
(5) And carrying out continuous casting, hot rolling, cooling, coiling and pickling on the refined molten steel to obtain a pickled plate.
Test part
Physical and chemical properties of the pickled plates prepared in examples 1 to 2 and comparative examples 1 to 2 were tested, and specific test methods are as follows:
internal quality (inclusion rating): the method is used for measuring the nonmetallic inclusion content in steel by GB/T10561-2005, standard rating chart microscopic examination method.
Strength, elongation: the GB/T228.1-2010 section 1 of the tensile test of metallic materials is adopted: room temperature test method.
The results of the physical and chemical properties of the pickled plates prepared in examples 1 to 2 and comparative examples 1 to 2 are shown in Table 1.
TABLE 1 results of physical and chemical Properties test of acid pickled plate
As can be seen from the physical and chemical properties of the pickled plates in Table 1, the pickled plates of examples 1-2 have no transverse fold defect, good inclusion rating, and excellent tensile strength, yield strength and elongation. Comparative example 1 is different from example 1 in that the deoxidization alloying is performed for a different time and the ladle casting residue is not used at the time of slag formation, thus resulting in a higher nitrogen increase (higher than 80 ppm) in the molten steel in comparative example 1, a decrease in strength of the resulting pickled plate, and a deterioration in inclusion rating. Comparative example 2 is different from example 1 in that the contents of Mn, ti and Nb are not within the ranges described in the present application, and in that, unlike example 1, the deoxidization alloying is performed for a different time, ladle casting slag is not used in the slag formation, so that the crack generation rate of the pickled plate is high, the strength and elongation are low, and the inclusion rating is deteriorated.
In conclusion, the acid-washed plate prepared by improving the chemical components and the production process of the acid-washed plate has the advantages of excellent quality, high strength and low production cost.
While the application has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
1. A method for producing a pickled plate, comprising:
smelting in a converter: adding molten iron and scrap steel into a converter to perform converter smelting to obtain molten steel; wherein the weight ratio 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 a converter and transferring the molten steel into a ladle refining furnace, and adding aluminum blocks, silicon manganese and low-carbon ferromanganese into the molten steel to deoxidize and alloy the molten steel to obtain deoxidized and alloyed molten steel;
ladle refining: adding ladle casting residue into the deoxidized alloyed molten steel in the early stage of slag formation 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 65ppm;
and (3) casting blank molding: and carrying out continuous casting, hot rolling, cooling, coiling and pickling on the refined molten steel to obtain a pickled plate.
2. The method for producing a pickled plate according to claim 1, wherein in the converter smelting step, the volume of the scrap steel added to the converter is less than 1m 3 。
3. The method for producing a pickled plate according to claim 1, wherein in the deoxidizing alloying step, the molten steel is tapped from a converter into a red-ladle tap, and the ladle inner wall temperature is > 800 ℃.
4. The method for producing a pickled plate according to claim 1, wherein in the deoxidizing alloying step, the aluminum block is added to the molten steel in an amount of 1.1 to 1.5kg based on a weight of 1 ton of molten steel.
5. The method for producing a pickled plate according to claim 1, wherein in the deoxidizing 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 the silicomanganese is 40.+ -. 15ppm.
6. The method for producing a pickled plate according to claim 1, wherein in the deoxidizing alloying step, low-carbon ferromanganese is added to the molten steel in an amount of 1.2 to 1.6kg based on the weight of 1 ton of molten steel, and the nitrogen content of the low-carbon ferromanganese is 120.+ -. 30ppm.
7. The method for producing a pickled plate according to claim 1, wherein in the ladle refining step, ladle casting residues selected from casting residues of low sulfur steel grades are added to the deoxidized alloyed molten steel.
8. The method of producing pickled plate as claimed in claim 7, wherein the low sulfur steel grade has a sulfur content of less than 0.008%.
9. The method for producing a pickled plate according to claim 1, wherein in the casting blank forming step, the pickled plate comprises the chemical components in weight percent: c:0.04-0.065%, si 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 to 0.06 percent, less than or equal to 0.03 percent of Nb, and the balance of Fe and unavoidable impurities.
10. The method for producing a pickled plate according to claim 9, wherein in the casting blank forming step, the pickled plate comprises the chemical components 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 of Fe and unavoidable impurities.
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