CN116426812A - Manufacturing method of electrolytic aluminum cathode flat steel - Google Patents
Manufacturing method of electrolytic aluminum cathode flat steel Download PDFInfo
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- CN116426812A CN116426812A CN202310307274.4A CN202310307274A CN116426812A CN 116426812 A CN116426812 A CN 116426812A CN 202310307274 A CN202310307274 A CN 202310307274A CN 116426812 A CN116426812 A CN 116426812A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 59
- 239000010959 steel Substances 0.000 title claims abstract description 59
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 39
- 239000002893 slag Substances 0.000 claims abstract description 33
- 238000005096 rolling process Methods 0.000 claims abstract description 25
- 229910052742 iron Inorganic materials 0.000 claims abstract description 23
- 238000005266 casting Methods 0.000 claims abstract description 17
- 238000007664 blowing Methods 0.000 claims abstract description 14
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- 239000011572 manganese Substances 0.000 claims abstract description 10
- 238000007670 refining Methods 0.000 claims abstract description 10
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 16
- 239000001301 oxygen Substances 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 8
- 238000005261 decarburization Methods 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000009849 vacuum degassing Methods 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000010079 rubber tapping Methods 0.000 abstract description 6
- 239000011593 sulfur Substances 0.000 abstract description 5
- 229910001209 Low-carbon steel Inorganic materials 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000011574 phosphorus Substances 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 11
- 238000012360 testing method Methods 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000754 repressing effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- 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
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- 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
-
- 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
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- 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
Abstract
The invention discloses a manufacturing method of electrolytic aluminum cathode flat steel, which adopts low-phosphorus, low-manganese and low-sulfur refined waste steel through molten iron pretreatment, converter double slag method smelting, converter over-blowing treatment, double slag-stopping tapping, refining of an oxidizing slag system, special covering agent and covering slag for low-carbon steel for continuous casting, reduction of secondary oxidation, control of rolling temperature and avoidance of process guarantee measures such as red and brittle temperature interval, and the like, and the manufactured electrolytic aluminum cathode flat steel DZ10 can completely meet the requirements of aluminum factories on high-conductivity cathode flat steel. The DZ10 cathode flat steel manufactured by adopting reasonable chemical component design and deep demanganization and deep dephosphorization core process technology design has the casting blank component purity reaching the level of 3.2N, and can effectively reduce the resistivity of the cathode steel bar; the content of nonmetallic inclusion is low, and the purity of the steel is high; the low-power structure, the gas content and the mechanical property of the finished steel reach the standard, and the stable production of the low-cost ultra-purity electrolytic aluminum cathode flat steel is realized, thereby meeting the requirements of the electrolytic aluminum industry.
Description
Technical Field
The invention belongs to the technical field of metallurgical material production and processing, and particularly relates to a manufacturing method of electrolytic aluminum cathode flat steel.
Background
The electrolytic aluminum cathode flat steel is also called cathode flat steel or cathode steel bar, and is mainly used as the cathode of an electrolytic tank in the electrolytic aluminum industry. The aluminum is produced by adopting an electrolytic method, the equipment is an aluminum electrolytic tank, the aluminum electrolytic tank comprises a tank body, anode equipment and cathode equipment, the cathode equipment mainly comprises a cathode carbon block and cathode flat steel, the cathode flat steel is embedded into the carbon block after being processed, and the effects of uniformly distributing current, improving the horizontal current of aluminum liquid, realizing low-voltage production and reducing the direct current power consumption of electrolytic aluminum are achieved. Because the electricity consumption cost of the electrolytic aluminum industry is larger and is about 40 percent of the total cost of an electrolytic aluminum enterprise, along with the improvement of the productivity of the electrolytic aluminum, the electrolytic aluminum factory is gradually developed towards the direction of large current and large tank type in order to further reduce the electricity consumption cost of the enterprise and the requirements of energy conservation, emission reduction and consumption reduction. Meanwhile, in order to reduce consumption, materials with better conductivity, high purity and conductivity are expected to be the development trend in the future. At present, the main materials of the produced cathode steel bar are Q195 and SAE1006, the resistivity at 20 ℃ is less than or equal to 0.13 mu omega-m, and the requirements of cost reduction and consumption reduction in the electrolytic aluminum industry are not met.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the manufacturing method of the electrolytic aluminum cathode flat steel, and the electrolytic aluminum cathode flat steel DZ10 produced by the method belongs to ultralow-carbon, ultralow-manganese, ultralow-sulfur and phosphorus steel types, has high purity and excellent performance, has the resistivity of less than or equal to 0.10 mu omega-m at 20 ℃, can effectively reduce the resistivity, thereby reducing the electricity consumption cost of electrolytic aluminum enterprises and meeting the requirements of the electrolytic aluminum industry.
In order to achieve the aim of the invention, the invention provides a manufacturing method for producing electrolytic aluminum cathode flat steel by a converter smelting process. Through molten iron pretreatment, low-phosphorus, low-manganese and low-sulfur refined waste steel is selected, a converter is smelted by a double slag method, converter over-blowing treatment is carried out, double slag blocking tapping is carried out, an oxidizing slag system is refined, a special covering agent for low-carbon steel for continuous casting is used for protecting slag, secondary oxidation is reduced, rolling temperature is controlled to avoid process guarantee measures such as a red and brittle temperature zone, and the manufactured electrolytic aluminum cathode flat steel DZ10 can completely meet the requirements of an aluminum factory on high-conductivity cathode flat steel.
A method of manufacturing electrolytic aluminum cathode flat steel, the method comprising the steps of: blast furnace molten iron, molten iron pretreatment, 180t converter smelting, LF external refining, RH vacuum degassing, continuous casting of slabs, slab cutting, heating by a step heating furnace, high-pressure water descaling, rolling, cooling, finishing, inspection and warehousing.
The molten steel components in the steps are controlled to be less than or equal to 0.008 percent by mass percent; mn is less than or equal to 0.03%; [ Si ] < 0.006%; p is less than or equal to 0.012 percent; [ S ] is less than or equal to 0.030%; [ Alt ] is less than or equal to 0.020%; the balance being iron and unavoidable impurities.
The manufacturing method of the electrolytic aluminum cathode flat steel further requires raw materials and auxiliary materials, the temperature of molten iron is more than or equal to 1300 ℃, and [ Mn ] in main components of the molten iron is less than or equal to 0.15%; [ S ] is less than or equal to 0.035%; the Ti content is less than or equal to 0.050 percent. The low sulfur scrap steel or the hanging rolling material is adopted, the total amount of the scrap steel is 20 to 25 tons, and the low carbon steel or the ultra low carbon steel is produced 1 furnace time before converter smelting for furnace washing.
In the technical scheme, further, in the molten iron pretreatment process, the pretreated molten iron [ S ] is less than or equal to 0.0025 percent, and slag is scraped.
In the technical scheme, further, in the converter smelting process, the double slag method is adopted to carry out dephosphorization and demanganization, the slag quantity of the first slag making and slag discharging is more than 2/3, after normal oxygen blowing is finished, the slag is killed for 2 minutes, the point blowing is carried out for 40 seconds to 60 seconds, the oxygen at the end point of the converter is more than or equal to 0.0700%, the temperature at the end point is more than 1670 ℃, the C at the end point is less than or equal to 0.04%, the Mn at the end point is less than or equal to 0.04%, the P at the end point is less than or equal to 0.008%, and the S at the end point is less than or equal to 0.005%. The ladle cleaning work is noted, residual steel and residues cannot be found in the ladle, an ultralow-carbon ladle is used, slag is blocked before and after a sliding plate for tapping, slag discharging is strictly forbidden, and the tapping is not deoxidized.
In the technical scheme, further, in the LF external refining process, the temperature is increased to slag, the temperature meets the RH requirement, lime is added to 6-10 kg/t for deep demanganization operation, and no deoxidization is performed. The temperature 1630+ -5deg.C after LF argon and 1620+ -5deg.C before RH argon. RH decarburization is performed after Mn, P and S satisfy internal control requirements.
In the technical scheme, further, in the RH refining process, the last batch of the RH tank washing heat is aluminum balls (manganese alloy is not allowed to be used), deep decarburization is carried out for 10-15 minutes, aluminum particles are adopted for deoxidization after decarburization, the free oxygen content in steel is ensured to be less than 0.0060%, the temperature after RH argon is 1610+/-5 ℃, and other components are not regulated. The cycle time is more than or equal to 15 minutes, the net cycle is more than or equal to 6 minutes, and no calcium treatment is carried out.
In the technical scheme, further, in the continuous casting process, the superheat degree of the tundish is controlled at 35+/-5 ℃ and the pulling speed is 1.0 m/min. The whole process is protected and cast, the crystallizer casting powder is ultra-low carbon casting powder, and the medium ladle slag is carbon-free medium ladle slag. And cutting the head and tail of the casting blank, wherein each is 2 meters.
In the technical scheme, in the heating process, a step-type heating furnace is adopted for heating, and the heating temperature is 1170-1190 ℃; the total heating time is more than or equal to 180 minutes.
According to the technical scheme, further, the cooling water strength of the rolling groove of the rolling mill is regulated before rolling in the rolling process, and cracks caused by too fast cooling of the corner of the casting blank in the rolling process are avoided. The initial rolling temperature is more than or equal to 1130 ℃, and the final rolling temperature is more than or equal to 960 ℃. The heating temperature is adjusted at any time according to the initial rolling temperature in the production process.
In the technical scheme, in the cooling process, the steel cooling bed is cooled in air, and the temperature of the lower cooling bed is less than or equal to 200 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) the purity of casting blank components reaches the level of 3.2N (namely 99.92%), and the resistivity of the cathode steel bar can be effectively reduced, so that the electricity consumption cost of an electrolytic aluminum enterprise is reduced, and the requirements of the electrolytic aluminum industry are met.
(2) The content of nonmetallic inclusion is low, and the purity of the steel is high.
(3) The low-power structure, gas content and mechanical property of the finished steel product meet the requirements of users.
Detailed Description
The invention is further illustrated below in connection with specific examples, but is not limited in any way. For the sake of brevity, the raw materials in the following examples are all commercial products unless otherwise specified, and the methods used are all conventional methods unless otherwise specified.
Examples
A method of manufacturing electrolytic aluminum cathode flat steel DZ10, the method comprising the steps of: blast furnace molten iron, molten iron pretreatment, 180t converter smelting, LF external refining, RH vacuum degassing, continuous casting of slabs, slab cutting, heating by a step heating furnace, high-pressure water descaling, rolling, cooling, finishing, inspection and warehousing.
The molten steel components in the steps are controlled to be less than or equal to 0.008 percent by mass percent; mn is less than or equal to 0.03%; [ Si ] < 0.006%; p is less than or equal to 0.012 percent; [ S ] is less than or equal to 0.030%; [ Alt ] is less than or equal to 0.020%; the balance being iron and unavoidable impurities.
The specific implementation steps for manufacturing the electrolytic aluminum cathode flat steel DZ10 by adopting the technical scheme of the invention are as follows:
1. molten iron in furnace
Molten iron temperature: 1322 ℃, the main molten iron composition is [ C ]:4.25%, [ Mn ]:0.149%, [ Si ]:0.39%, [ P ]:0.097% [ S ]:0.041%, [ Ti ]:0.022%.
2. Pretreatment of molten iron
177.7kg of magnesium powder, 694.6kg of desulfurization powder and 2.3 tons of slag removal amount, and [ S ] after treatment: 0.002%.
3. Converter smelting
The addition amount of the low-sulfur scrap steel adopted by the scrap steel is 24 tons. Converter combined blowing smelting, high flow oxygen blowing with oxygen flow of 40000Nm 3 And/h. Adding 3 tons of lime in primary blowing, blowing for 3 minutes and 25 seconds, discharging slag, adding 3.5 tons of lime in secondary blowing, and blowing for 9 minutes and 20 seconds again; and after blowing, measuring temperature and sampling, then spot-blowing for 58 seconds, and adding 500kg ladle ash in the tapping process. And (5) double slag blocking tapping. The binary basicity R of the slag is 4.3. End point oxygen 0.0609%, end point temperature 1644 ℃, end point [ C ] of converter]：0.048％，[Mn]：0.066％，[P]：0.012％，[S]：0.0027％。
4. LF external refining
The LF treatment period is 52 minutes, the molten steel temperature is 1558 ℃ before LF treatment, and the molten steel oxygen is 0.0809%. 1000kg of lime is added in batches in the first heating process, and the temperature is measured at 1559 ℃ after heating. 200kg lime is added in the secondary and tertiary heating processes, slag is slightly sticky, the temperature of molten steel after LF treatment is 1626 ℃, the oxygen content of molten steel is 0.0663%, the binary basicity R of slag is 12, and RH vacuum decarburization is carried out.
5. RH refining
The RH treatment period is 35 minutes, the temperature of molten steel before RH treatment is 1626 ℃, and the oxygen content of molten steel is 0.0569 percent. After the valve is opened, the molten steel enters a deep decarburization stage, the temperature of the molten steel is 1579 ℃ after 13 minutes, the oxygen is 0.05064%, and the temperature of the oxygen is 120Nm 3 After heating, the temperature is measured at 1598 ℃ and the oxygen is 0.0326%, and the secondary heating oxygen is 40Nm 3 Directly deoxidizing, measuring the temperature to 1610 ℃, measuring the aluminum value to 0.004%, supplementing 34kg of aluminum, carrying out clean circulation for 6 minutes, and carrying out repressing, wherein the temperature of molten steel after RH treatment is 1602 ℃ and the aluminum value is 0.014%.
6. Continuous casting
The average superheat degree of the tundish is 35 ℃, the temperature of the ladle is 1611 ℃, the specific water quantity of secondary cooling is 1.1NL/Kg, the casting period is 40 minutes, the drawing speed is 0.8 m/min, the specification of a continuous casting billet is 230 mm multiplied by 1290 mm, the cutting length of the casting billet is 7600 mm, and the head and the tail of the casting billet are respectively cut off by 2 m. And (3) protecting casting in the whole process, wherein the crystallizer casting powder uses ultra-low carbon casting powder. And flame cutting is adopted for casting blank cutting. And after the continuous casting blank is piled and cooled, longitudinal slitting is transferred to a rolling process.
7. Heating
The heating is performed by a step heating furnace, the heating temperature is 1180 ℃, and the total heating time is 330 minutes.
8. Rolling
And (3) cogging by adopting a 1150mm BD cogging machine, normally feeding high-pressure water to remove phosphorus, rolling for 3 times, enabling the initial rolling temperature to be 1130-1170 ℃, enabling the product to pass through a 3-frame 850 large-rod continuous rolling unit, enabling the product to enter a 3-frame 480 medium-rod continuous rolling unit to roll, enabling cooling water of a rolling mill to be closed by 50%, enabling the inlet temperature of the medium-rod to be 1090 ℃ and the final rolling temperature to be 980 ℃, and enabling the production specification to be 180mm multiplied by 130mm. No crack defects were found during the production process.
9. Cooling
Air cooling the steel, and cooling the steel to 130 ℃.
The chemical composition of the electrolytic aluminum cathode flat steel DZ10 manufactured by the example is C:0.002%, mn:0.02%, si:0.002%, P:0.004%, S:0.004%, cr:0.012%, mo:0.003%, ti:0.0003%, cu:0.006%, ni:0.004%, nb:0.0011%, alt:0.014%, V:0.0016%, B:0.0003%, ca:0.0001%, W:0.0026%.
The results of the low-power tissue test of the example products are shown in Table 1. As can be seen from Table 1, the steel structure has good compactness.
TABLE 1 results of the final product macrostructure tests
The nonmetallic inclusion test results of the example products are shown in table 2. As can be seen from Table 2, the purity of the steel is high.
TABLE 2 non-metallic inclusion test results for example products
The mechanical properties of the finished product of the example are shown in Table 3. As can be seen from table 3, the mechanical properties meet the standard requirements.
TABLE 3 mechanical property test results of the finished products of the examples
The gas test results of the example products are shown in Table 4. As can be seen from Table 4, the steel has low harmful elements.
TABLE 4 gas check results for example end products
Resistivity test results for example finished products: resistivity at 20 ℃): 0.10 mu.omega.m. Can meet the requirements of cost reduction and consumption reduction in the electrolytic aluminum industry.
Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art without departing from the scope of the technology, or the technology can be modified to be equivalent. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall still fall within the scope of the technical solution of the present invention.
Claims (10)
1. A method of manufacturing electrolytic aluminum cathode flat steel, the method comprising the steps of: blast furnace molten iron, molten iron pretreatment, 180t converter smelting, LF external refining, RH vacuum degassing, continuous casting of slabs, slab cutting, heating by a step heating furnace, high-pressure water descaling, rolling, cooling, finishing, inspection and warehousing.
2. The method according to claim 1, wherein the molten steel composition in the method step is controlled to [ C ]. Ltoreq.0.008% by mass; mn is less than or equal to 0.03%; [ Si ] < 0.006%; p is less than or equal to 0.012 percent; [ S ] is less than or equal to 0.030%; [ Alt ] is less than or equal to 0.020%; the balance being iron and unavoidable impurities.
3. The method of claim 2, wherein the raw materials and the auxiliary materials are required, the temperature of molten iron is more than or equal to 1300 ℃, and [ Mn ] in the main component of the molten iron is less than or equal to 0.15%; [ S ] is less than or equal to 0.035%; the Ti content is less than or equal to 0.050 percent.
4. The method according to claim 3, wherein in the molten iron pretreatment process, the pretreated molten iron [ S ] is less than or equal to 0.0025%, and slag is scraped off.
5. The method according to claim 4, wherein in the converter smelting process, the converter is subjected to double slag method for dephosphorization and demanganization, the slag amount for the first slag formation is more than 2/3, the slag is blown off after the normal oxygen blowing is finished, the slag is killed for 2 minutes, the blowing time is 40-60 seconds, the oxygen at the end point of the converter is more than or equal to 0.0700%, the temperature at the end point is more than 1670 ℃, the [ C ] is less than or equal to 0.04%, the [ Mn ] is less than or equal to 0.04%, the [ P ] is less than or equal to 0.008%, and the [ S ] is less than or equal to 0.005%.
6. The method of claim 5, wherein in the LF external refining process, the temperature is raised to slag, the RH requirement is met, lime is added for 6-10 kg/t to carry out deep demanganization operation, and the process is not deoxidized; the temperature after LF argon is 1630+/-5 ℃, and the temperature before RH argon is 1620+/-5 ℃; RH decarburization is performed after Mn, P and S satisfy internal control requirements.
7. The method of claim 6, wherein in the RH refining step, the last batch of RH wash tank heat is aluminum balls, and manganese alloys are not allowed to be used; deep decarburization is carried out for 10-15 minutes, aluminum particles are adopted for deoxidization after decarburization, so that the free oxygen content in steel is less than 0.0060%, the RH argon post-temperature is 1610+/-5 ℃, the circulation time is more than or equal to 15 minutes, the net circulation is more than or equal to 6 minutes, and no calcium treatment is carried out.
8. The method according to claim 7, wherein in the continuous casting process, the superheat degree of the tundish is controlled to be 35+/-5 ℃ and the pulling speed is controlled to be 1.0 m/min; the whole process protection casting is carried out, wherein the crystallizer casting powder adopts ultralow-carbon casting powder, and the middle ladle slag adopts carbon-free middle ladle slag; and cutting the head and tail of the casting blank, wherein each is 2 meters.
9. The method according to claim 8, wherein in the heating step, the heating is performed by a step-type heating furnace at 1170-1190 ℃ for a total heating time of 180 minutes or more.
10. The method of claim 9, wherein in the rolling and cooling steps, the initial rolling temperature is equal to or higher than 1130 ℃ and the final rolling temperature is equal to or higher than 960 ℃; air cooling the steel in a cooling bed, wherein the temperature of the lower cooling bed is less than or equal to 200 ℃.
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