CN114807491B - Production method of ultra-low oxygen and sulfide high spheroidization rate medium and low carbon steel molten steel - Google Patents
Production method of ultra-low oxygen and sulfide high spheroidization rate medium and low carbon steel molten steel Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 140
- 239000010959 steel Substances 0.000 title claims abstract description 140
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 23
- 239000001301 oxygen Substances 0.000 title claims abstract description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 229910000954 Medium-carbon steel Inorganic materials 0.000 title claims abstract description 16
- 238000007670 refining Methods 0.000 claims abstract description 34
- 239000002893 slag Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000000126 substance Substances 0.000 claims abstract description 20
- 238000011282 treatment Methods 0.000 claims abstract description 12
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 11
- 239000000956 alloy Substances 0.000 claims abstract description 11
- 230000004048 modification Effects 0.000 claims abstract description 3
- 238000012986 modification Methods 0.000 claims abstract description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 46
- 229910052786 argon Inorganic materials 0.000 claims description 23
- 229910000838 Al alloy Inorganic materials 0.000 claims description 17
- 238000007664 blowing Methods 0.000 claims description 16
- 238000009749 continuous casting Methods 0.000 claims description 12
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 10
- 229910052749 magnesium Inorganic materials 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- 239000000292 calcium oxide Substances 0.000 claims description 5
- 235000012255 calcium oxide Nutrition 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 239000002436 steel type Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 238000009849 vacuum degassing Methods 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 239000003607 modifier Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000005098 hot rolling Methods 0.000 abstract description 2
- 239000011575 calcium Substances 0.000 description 9
- 239000011777 magnesium Substances 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- RBORURQQJIQWBS-QVRNUERCSA-N (4ar,6r,7r,7as)-6-(6-amino-8-bromopurin-9-yl)-2-hydroxy-2-sulfanylidene-4a,6,7,7a-tetrahydro-4h-furo[3,2-d][1,3,2]dioxaphosphinin-7-ol Chemical compound C([C@H]1O2)OP(O)(=S)O[C@H]1[C@@H](O)[C@@H]2N1C(N=CN=C2N)=C2N=C1Br RBORURQQJIQWBS-QVRNUERCSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- FHKPLLOSJHHKNU-INIZCTEOSA-N [(3S)-3-[8-(1-ethyl-5-methylpyrazol-4-yl)-9-methylpurin-6-yl]oxypyrrolidin-1-yl]-(oxan-4-yl)methanone Chemical compound C(C)N1N=CC(=C1C)C=1N(C2=NC=NC(=C2N=1)O[C@@H]1CN(CC1)C(=O)C1CCOCC1)C FHKPLLOSJHHKNU-INIZCTEOSA-N 0.000 description 1
- JAWMENYCRQKKJY-UHFFFAOYSA-N [3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-ylmethyl)-1-oxa-2,8-diazaspiro[4.5]dec-2-en-8-yl]-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]methanone Chemical compound N1N=NC=2CN(CCC=21)CC1=NOC2(C1)CCN(CC2)C(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F JAWMENYCRQKKJY-UHFFFAOYSA-N 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000003466 welding 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
- 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
- C21C5/36—Processes yielding slags of special composition
-
- 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
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- 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)
Abstract
The invention discloses a production method of ultra-low oxygen and sulfide high spheroidization medium and low carbon steel molten steel, which mainly solves the technical problems of high production cost, low production efficiency and low spheroidization rate of sulfide in the existing medium and low carbon steel. The technical scheme is that the production method of the ultra-low oxygen and sulfide high spheroidization medium and low carbon steel molten steel comprises the following steps: molten steel meeting the chemical component requirement is obtained through converter smelting, and the molten steel tapped from the converter is controlled to have w S less than or equal to 0.01% and w O less than or equal to 800ppm; conveying molten steel in the ladle to an LF refining furnace for ladle slag modification, molten steel temperature regulation and alloy component regulation, and controlling the binary basicity R of the refining slag to be 5-10; and conveying the molten steel in the ladle to an RH refining furnace for refining treatment to obtain finished molten steel. The w T.O in the finished molten steel produced by the method is less than or equal to 10ppm, and the aspect ratio of sulfide in the steel plate obtained by hot rolling the plate blank cast by the molten steel is less than or equal to 2.5.
Description
Technical Field
The invention relates to a production method of medium-low carbon steel molten steel, in particular to a production method of medium-low carbon steel molten steel with ultralow oxygen and high sulfide spheroidization rate, belonging to the technical field of steel smelting and continuous casting.
Background
With the wide use of steel materials in environments with high requirements on various service conditions, the requirements on various performances of the steel materials are higher and higher, and besides the design of the components of the steel materials, the performances of products are improved mainly by controlling the oxygen content and the forms of sulfides in the steel.
The steel for automobiles has high requirements on material fatigue performance and processability, and the steel for automobiles is required to reduce the number of inclusions in the steel and basically spheroidize sulfides in the steel. In general, for medium and low carbon steel with w [ C ] less than or equal to 0.20% produced by adopting the processes of converter smelting, LF furnace refining and RH furnace refining, w [ T.O ] in finished steel is 10-30ppm, and the existing conventional process can not stably control w [ T.O ] less than or equal to 10ppm in steel.
In order to stably control w [ T.O ] in steel to be less than or equal to 10ppm, technicians mainly adopt a converter low-temperature and high-carbon tapping method to reduce free oxygen in molten steel, and the method generally increases cost and nitrogen content of molten steel because the molten steel is low in temperature and needs to be heated in an LF furnace; another method is to refine refining slag with high alkalinity and high reducibility, strengthen interface reaction between molten steel and slag and the like to reduce the total oxygen content of the molten steel, and the method has the main defects of high cost and low efficiency.
The Chinese patent application with publication number of CN110205443A discloses a low-carbon silicon-aluminum-containing killed steel ultralow oxygen smelting method, which inhibits Al by controlling alloy type and adding time 2 O 3 Conversion to calcium aluminate, removal of Al by RH vacuum 2 O 3 The system is mixed with the T.O to be controlled within 8 ppm.
The Chinese patent application with the application publication number of CN110079724A discloses an ultralow-oxygen medium-low carbon steel smelting method, wherein the adding time of alloy and the alkalinity of slag are controlled, the impurities are removed in vacuum in RH process, and the T.O is controlled within 8 ppm.
The Chinese patent application with the publication number of CN103937926A discloses a method for generating ultralow-carbon steel with ultralow oxygen content, wherein the highest vacuum degree and the circulation time are controlled by tapping slag stopping, lime and fluorite slag adjusting, RH is used for controlling the highest vacuum degree and the circulation time, deoxidizing is carried out after decarburization, and meanwhile, deoxidizing agent is scattered for deoxidizing ladle top slag, so that the T.O content in the molten steel can be controlled below 15 ppm.
Disclosure of Invention
The invention aims to provide a production method of ultra-low oxygen and sulfide high spheroidization rate medium and low carbon steel molten steel, which mainly solves the technical problems of high production cost, low production efficiency and low spheroidization rate of sulfide in the existing medium and low carbon steel, and w [ T.O ] in the medium and low carbon steel produced by the method is less than or equal to 10ppm, and the aspect ratio of sulfide is less than or equal to 2.5.
The invention adopts the technical ideas that Al in molten steel is refined by ladle bottom argon blowing and RH furnace vacuum refining 2 O 3 、SiO 2 Liquefying and removing the composite inclusions, and effectively removing Al 2 O 3 The inclusion realizes low-cost smelting of the ultralow-oxygen molten steel.
The technical scheme adopted by the invention is that the production method of the ultra-low oxygen and sulfide high spheroidization rate medium and low carbon steel molten steel comprises the following steps:
1) Molten steel meeting the chemical component requirement is obtained through converter smelting, and the molten steel tapped from the converter is controlled to have w S less than or equal to 0.01% and w O less than or equal to 800ppm; adding aluminum-containing alloy into a ladle to further deoxidize molten steel in the tapping process of the converter, and adding quicklime into the ladle to modify ladle slag;
2) Molten steel in the ladle is conveyed to an LF refining furnace for ladle slag modification, molten steel temperature regulation and alloy composition regulation, quicklime and modifier are added according to the slag quantity under the converter to modify the ladle slag, and the binary alkalinity R (w (CaO)/w (SiO) of the refining slag of the refining furnace is controlled 2 ) 5-10 wt% w.T.Fe in refining slag]Less than or equal to 2.0 percent; regulating and controlling chemical components except Mg and Ca in the molten steel to design components of steel types; argon is blown into molten steel in the steel ladle to perform argon blowing treatment on the molten steel, the flow of argon blown into the steel ladle at the bottom is 200-1000L/min, and after the time of argon blowing into the steel ladle at the bottom is more than or equal to 5min, the argon blowing into the steel ladle is stoppedArgon is blown into the molten steel, and the component detection is carried out on the molten steel;
3) Conveying molten steel in a ladle to an RH refining furnace for refining treatment, adding alloy according to the molten steel components discharged from an LF furnace to regulate and control the chemical components of the molten steel to the design components of steel types, carrying out vacuum degassing treatment on the molten steel for 5-8 min, and then feeding Mg-Ca-Al alloy wires into the molten steel in the ladle for treating the molten steel, wherein w [ Ca ] in the molten steel is controlled to be 10-15 ppm; argon is blown into the molten steel in the ladle after the Mg-Ca-Al alloy wire is fed, the time for blowing argon at the bottom of the ladle is 6-8 min, and the flow rate of argon at the bottom of the ladle is 200-1000L/min, so that the finished molten steel is obtained.
The w [ T.O ] in the finished molten steel produced by the method is less than or equal to 10ppm; the finished molten steel is cast into a continuous casting plate blank, the aspect ratio of sulfide of the hot rolled steel plate obtained after hot continuous rolling of the continuous casting plate blank is less than or equal to 2.5, and the spheroidization rate of sulfide is high.
In the step 3), the chemical components of the Mg-Ca-Al alloy wire are as follows in percentage by weight: ca:13-15%, mg:13-15%, al:50-55%, and the balance of Fe and unavoidable impurities; the speed of feeding the Mg-Ca-Al alloy wire into the molten steel is 1.5-2.0 m/s, and the effect is good.
The reason for determining the process control parameters of the invention is as follows:
1. setting the weight percentage of S in molten steel tapped from a converter
The weight percentage of S in the molten steel tapped from the converter is controlled to be less than or equal to 0.01 percent, mainly because the S content in the steel with performances such as butt welding, fatigue resistance and the like is generally less than or equal to 0.006 percent, even less than or equal to 0.002 percent, the S content in the molten steel tapped from the converter is controlled mainly for reducing the desulfurization rate of an LF furnace, reducing the desulfurization time and reducing the nitrogen increment of the molten steel; control of w [ O ] in molten steel tapped from converter]Less than or equal to 800ppm, mainly reducing the deoxidization yield Al 2 O 3 The content of the calcium carbonate in the LF slag formation can be reduced while the cleanliness of the molten steel is improved, so that more lime is added in order to ensure Ca/Al in the LF slag formation.
2. Setting of speed of feeding Mg-Ca-Al alloy wire into molten steel
The invention adopts Mg-Ca-Al composite treatment technology to regulate and control inclusions in molten steel; because the Mg and Ca content in the Mg-Ca-Al alloy wire is higher, the melting point and the boiling point are low, the wire feeding speed is controlled to be 1.5-2.0 m/s, when the wire feeding speed is less than 1.5m/s, the magnesium is easier to gasify, the magnesium content yield is low, the calcium yield is relatively higher, and the proportion of the magnesium and the calcium can not be well controlled to be 1.0-2.0; when the feeding linear speed is more than 2.0m/s, magnesium reacts with steel slag and oxygen element in molten steel strongly, so that molten steel is easy to turn over and splash, secondary oxidization of molten steel is caused, and the speed of feeding Mg-Ca-Al alloy wire into molten steel is limited to be 1.5-2.0 m/s by comprehensively considering.
3. Setting the time for blowing argon gas into the ladle bottom of molten steel after feeding Mg-Ca-Al alloy wire into the molten steel
After the Mg-Ca-Al alloy wire is fed, the ladle bottom argon blowing time is 6-8 min, the formed liquid inclusion is promoted to float upwards, the formation of Mg-containing particles is accelerated, the Mg-containing particles can be used as a sulfide precipitation interface, the amount of plastic inclusion MnS is reduced, the deformation into a long strip shape in the hot rolling process is avoided, and the purpose of spheroidizing sulfide is achieved.
Compared with the prior art, the invention has the following positive effects: 1. w [ T.O ] in the medium and low carbon steel produced by the method is less than or equal to 10ppm; the finished molten steel is cast into a continuous casting plate blank, and the aspect ratio of sulfide of a hot rolled steel plate obtained after hot continuous rolling of the continuous casting plate blank is less than or equal to 2.5, so that the smelting of medium and low carbon steel with special requirements on sulfide and total oxygen content is satisfied. 2. The method has the characteristics of simple operation and low cost.
Detailed Description
The present invention will be further described with reference to examples 1 to 4, as shown in tables 1 to 6.
The capacity of the ladle for containing molten steel in the embodiment of the invention is 250 tons, and the production steel types in the embodiments 1 and 2 are HR60; examples 3, 4 produced steel grade Q345B; the process of the invention is adopted to produce 4 furnaces of molten steel, and the production process comprises the following steps: converter smelting, LF furnace refining and RH furnace refining, and feeding an Mg-Ca-Al alloy wire after the RH furnace is subjected to vacuum degassing treatment;
the conventional process route is as follows: converter smelting, LF furnace refining, RH furnace refining and feeding calcium wires after RH treatment.
The steel of examples 1 and 2 comprises the following chemical components in percentage by weight: c:0.05-0.10%, si:0.05-0.50%, mn:1.20-1.60%, S is less than or equal to 0.010%, P is less than or equal to 0.02%, ti:0.015-0.03%, mg:0.0005-0.0015%, ca:0.001-0.003%, al:0.02-0.04%, N is less than or equal to 0.006%.
The steel of examples 3 and 4 comprises the following chemical components in percentage by weight: c:0.10-0.20%, si:0.15-0.50%, mn:0.80-1.50%, S is less than or equal to 0.010%, P is less than or equal to 0.02%, ti:0.025-0.05%, mg:0.0005-0.0015%, ca:0.001-0.003%, al:0.02-0.05%, N is less than or equal to 0.006%.
The weight percentage of C, S, O in the molten steel tapped from the converter was controlled by converter melting, and the chemical composition of the molten steel tapped from the converter was shown in table 1.
Table 1 chemical composition of molten steel tapped from a converter according to an embodiment of the present invention, unit: weight percent.
Conveying molten steel to an LF refining furnace, adding an Al alloy block for deoxidization, then adding Mn alloy, nb alloy and Ti alloy, and carrying out bottom argon blowing on the molten steel for more than 8min by adjusting the components of the molten steel, wherein the flow rate of the bottom argon blowing of a ladle is 200-1000L/min; refining slag control parameters of the molten steel discharged from the LF refining furnace are shown in Table 2, and chemical compositions of the molten steel discharged from the LF refining furnace are shown in Table 3.
TABLE 2 refining slag control parameters for outgoing molten steel from LF refining furnace in accordance with embodiments of the present invention
Table 3 chemical composition of outgoing molten steel of LF refining furnace according to the embodiment of the present invention, unit: weight percent.
| Element(s) | C | Si | Mn | P | S | Al | Ti |
| Example 1 | 0.064 | 0.083 | 1.298 | 0.010 | 0.0033 | 0.049 | 0.021 |
| Example 2 | 0.062 | 0.071 | 1.294 | 0.009 | 0.0045 | 0.035 | 0.020 |
| Example 3 | 0.157 | 0.218 | 1.091 | 0.014 | 0.0053 | 0.030 | 0.028 |
| Example 4 | 0.159 | 0.185 | 0.932 | 0.018 | 0.0030 | 0.026 | 0.026 |
And (3) conveying molten steel to an RH refining furnace, carrying out pure degassing treatment on the molten steel for 5-8 minutes, and adding chemical components except Mg and Ca at the accurate adjustment position of the alloy according to the components in the table 2. Feeding the treated molten steel, wherein the feeding speed of the Mg-Ca-Al alloy wire is 1.8m/s, and the chemical components of the Mg-Ca-Al alloy wire are as follows in percentage by weight: mg:14.51%, ca:13.98, al:52.15% and the balance of Fe and other inclusion elements.
The conventional process feeds Ca-containing alloy wire and the other treatments are the same as in the examples.
The ladle bottom argon blowing time is 6-8 min, the ladle bottom argon blowing flow is 200-1000L/min, the molten steel components are homogenized to obtain the finished molten steel, the molten steel components are sampled and detected, w [ T.O ] in the finished molten steel is less than or equal to 10ppm, and the chemical components of the finished molten steel are shown in Table 4; the RH outbound refining slag was sampled and analyzed for chemical composition, and the results are shown in Table 4.
Table 4 the chemical composition of the final molten steel in the inventive example, unit: weight percent.
| Element(s) | C | Si | Mn | P | S | Al | Ti | Ca | Mg | O | N |
| Example 1 | 0.062 | 0.076 | 1.283 | 0.009 | 0.0032 | 0.038 | 0.018 | 0.015 | 0.0005 | 0.0010 | 0.0050 |
| Example 2 | 0.065 | 0.069 | 1.297 | 0.010 | 0.0037 | 0.034 | 0.018 | 0.0022 | 0.007 | 0.0009 | 0.0051 |
| Example 3 | 0.169 | 0.220 | 1.113 | 0.014 | 0.0047 | 0.028 | 0.029 | 0.0017 | 0.0011 | 0.0009 | 0.0043 |
| Example 4 | 0.159 | 0.188 | 1.098 | 0.018 | 0.0026 | 0.025 | 0.024 | 0.0018 | 0.0008 | 0.0008 | 0.0047 |
And (3) carrying out slab continuous casting on the molten steel refined by the RH refining furnace to obtain a continuous casting slab, wherein the section of the continuous casting slab is 1320mm multiplied by 230mm, the length is 8-12.5 m, and the total oxygen content of the slab is detected.
The continuous casting slab is hot rolled, a hot rolled steel plate with the thickness of 4-8mm is rolled by adopting a controlled rolling and cooling process, an ASPEX inclusion scanner is used for analyzing the inclusions of the hot rolled steel plate, the scanning size is more than or equal to 1 mu m, and the scanning area is 60mm 2 Sulfide aspect ratio parameters of the hot rolled steel sheet are shown in Table 5.
TABLE 5 parameters of total oxygen content of slabs and hot rolled steel plate impurities
| Category(s) | W [ T.O ] in slab]/ppm | Aspect ratio of sulfide in hot rolled steel sheet |
| Example 1 | 8 | 2.25 |
| Example 2 | 8 | 2.43 |
| Example 3 | 9 | 2.16 |
| Example 4 | 7 | 1.99 |
The aspect ratio of sulfide of the hot rolled steel plate obtained by hot continuous rolling of the continuous casting plate blank is less than or equal to 2.5, and the spheroidization rate of sulfide is high.
In addition to the embodiments described above, other embodiments of the invention are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the invention.
Claims (4)
1. The production method of the ultra-low oxygen and sulfide high spheroidization rate medium and low carbon steel molten steel is characterized by comprising the following steps of:
1) Molten steel meeting the chemical component requirement is obtained through converter smelting, and the molten steel tapped from the converter is controlled to have w S less than or equal to 0.01% and w O less than or equal to 800ppm; adding aluminum-containing alloy into a ladle to further deoxidize molten steel in the tapping process of the converter, and adding quicklime into the ladle to modify ladle slag;
2) Conveying molten steel in a ladle to an LF refining furnace for ladle slag modification, molten steel temperature regulation and alloy composition regulation, adding quicklime and a modifier according to the slag quantity under a converter to modify the ladle slag, and controlling the binary basicity R of the refining slag in the refining furnace to be 5-10, wherein w [ T.Fe ] in the refining slag is less than or equal to 2.0%; regulating and controlling chemical components except Mg and Ca in the molten steel to design components of steel types; blowing argon into molten steel in a ladle to perform argon blowing treatment on the molten steel, wherein the flow of argon blown into the bottom of the ladle is 200-1000L/min, and after the time of argon blowing into the bottom of the ladle is more than or equal to 5min, stopping blowing argon into the molten steel in the ladle, and performing component detection on the molten steel;
3) Conveying molten steel in a ladle to an RH refining furnace for refining treatment, adding alloy according to the molten steel components discharged from an LF furnace to regulate and control the chemical components of the molten steel to the design components of steel types, carrying out vacuum degassing treatment on the molten steel for 5-8 min, and then feeding Mg-Ca-Al alloy wires into the molten steel in the ladle for treating the molten steel, wherein w [ Ca ] in the molten steel is controlled to be 10-15 ppm; argon is blown into the molten steel in the ladle after the Mg-Ca-Al alloy wire is fed, the time for blowing argon at the bottom of the ladle is 6-8 min, and the flow rate of argon at the bottom of the ladle is 200-1000L/min, so that the finished molten steel is obtained.
2. The method for producing ultra-low oxygen and sulfide high spheroidization medium and low carbon steel molten steel according to claim 1, wherein in the step 3), the chemical components of the Mg-Ca-Al alloy wire are as follows in weight percentage: ca:13-15%, mg:13-15%, al:50-55%, and the balance of Fe and unavoidable impurities; the speed of feeding the Mg-Ca-Al alloy wire into the molten steel is 1.5-2.0 m/s.
3. The method for producing ultra-low oxygen and sulfide high spheroidization medium and low carbon steel molten steel according to claim 1, wherein w [ T.O ] in the finished molten steel is less than or equal to 10ppm.
4. The method for producing ultra-low oxygen and sulfide high spheroidization medium and low carbon steel molten steel according to claim 1, wherein the finished molten steel is cast into a continuous casting slab, and the aspect ratio of sulfide of a hot rolled steel plate obtained by hot continuous rolling of the continuous casting slab is less than or equal to 2.5.
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