CN113528928A - Iron-nickel base alloy continuous casting billet for precision strip steel and production method thereof - Google Patents
Iron-nickel base alloy continuous casting billet for precision strip steel and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 113
- 239000010959 steel Substances 0.000 title claims abstract description 113
- 238000009749 continuous casting Methods 0.000 title claims abstract description 69
- 239000000956 alloy Substances 0.000 title claims abstract description 60
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 59
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 40
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 22
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- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 14
- 239000010936 titanium Substances 0.000 claims abstract description 13
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 13
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052786 argon Inorganic materials 0.000 claims abstract description 11
- 229910000863 Ferronickel Inorganic materials 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000005275 alloying Methods 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 239000002699 waste material Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 8
- 239000010436 fluorite 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
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- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 5
- 239000006187 pill Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
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- 238000004512 die casting Methods 0.000 description 5
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- 208000029154 Narrow face Diseases 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/0406—Moulds with special profile
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
-
- 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
- C21C7/068—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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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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
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- Chemical & Material Sciences (AREA)
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Abstract
The invention belongs to the technical field of metallurgical engineering, and particularly relates to an iron-nickel-based alloy continuous casting billet for precision strip steel and a production method thereof. The invention relates to a production method of an iron-nickel-based alloy continuous casting billet for precise strip steel, which comprises the following steps: (1) melting high chromium, ferronickel and the steel grade return waste by using an intermediate frequency furnace, and adding molten steel into an AOD furnace; (2) adding ferronickel, high-chromium and other alloys into the AOD to adjust the components of molten steel, decarburizing the molten steel to target components, reducing the components by using aluminum shots, slagging off the components after reduction, and then adding slag materials to perform secondary slag mixing; (3) adding part of aluminum to adjust the components of the molten steel, then carrying out titanium alloying, blowing argon and stirring, and then tapping; (4) adopting LF to adjust the temperature, and tapping after meeting the hard blowing and soft blowing time and flow rate standards; (5) and (4) continuous casting. The production method of the iron-nickel-based alloy continuous casting billet for the precise strip steel improves the production efficiency, reduces the cost and improves the product quality. According to the iron-nickel-based alloy continuous casting billet for the precision strip steel, O in the steel is reduced to below 15ppm, N is reduced to below 90ppm, H is reduced to below 3.5ppm, rolling edge cracks and heavy skin defects are eliminated, and precision rolling is realized to below 0.3 mm.
Description
Technical Field
The invention belongs to the technical field of metallurgical engineering, and particularly relates to an iron-nickel-based alloy continuous casting billet for precision strip steel and a production method thereof.
Background
The iron-nickel-based alloy is a special alloy material developed and produced by replacing part of nickel with iron, the nickel component of the iron-nickel-based alloy is between that of stainless steel and nickel-based alloy, and the scarcity and the economy of nickel and the usability of the material are balanced. Thus, it has better high temperature and corrosion resistance than stainless steel, but is less costly than nickel-based alloys. Because of good cost performance and excellent high-temperature and corrosion resistance of the iron-nickel-based alloy, the iron-nickel-based alloy has high quality stability in various reducing, oxidizing, chlorinating or acid-base environments and high-temperature environments, and is widely applied to the fields of petrochemical industry, environmental protection, oceans, papermaking, energy, nuclear power and the like.
For a long time, the alloy only depends on import and is expensive, and domestic only can adopt die casting and special smelting equipment to carry out small-batch production, so that the efficiency is low, the cost is high, the quality is unstable, and the large-scale application is severely restricted. Some enterprises also try to carry out large-scale continuous casting production, but because of the composition of the iron-nickel base alloy, the characteristics of molten steel and the complexity of heat transfer and reaction in the solidification process, the continuous casting process is easy to form nodules, adhere to breakout, form obvious cracks, segregate and other defects, and cannot be successful.
The high-temperature-resistant and corrosion-resistant iron-nickel-based alloy for the precise strip steel contains high oxidizable elements such as aluminum, titanium and the like, and has the problems of high molten steel viscosity, narrow solid-liquid two-phase region, serious nozzle nodulation and blockage in the continuous casting process, severe fluctuation of the liquid level of a crystallizer, modification and agglomeration of crystallizer protective slag, adhesion and steel leakage of a blank shell, poor control of superheat degree, high risk in the steel drawing process and the like.
Therefore, a set of low-cost and high-efficiency large-scale production process of the iron-nickel base alloy continuous casting billet is very necessary to be developed, the comprehensive improvement of the competitiveness of quality and cost is realized, the requirement of market large-scale application is met, and the problem of neck clamping of the key material in China is solved.
Disclosure of Invention
The invention provides an iron-nickel base alloy continuous casting billet for precise strip steel and a production method thereof, aiming at solving the problems of low efficiency, high cost, unstable quality, incapability of producing wide precise strip steel foils and the like in the traditional production processes of die casting, special smelting, conventional electric furnace smelting and the like, and solving the new problems of high component control difficulty, nodulation, steel leakage, cleanliness, low-power quality defects and the like in the continuous casting process caused by the application of the conventional continuous casting process.
On the one hand, the production method of the iron-nickel-based alloy continuous casting billet for the precision strip steel comprises the following steps:
(1) melting high chromium, ferronickel and the steel grade return waste by using an intermediate frequency furnace, and adding molten steel into an AOD furnace;
(2) adding alloy into AOD to adjust the components of molten steel, reducing by using aluminum balls, slagging off after reduction, and then adding reducing slag charge to carry out secondary slag mixing;
(3) adding aluminum to adjust the components of the molten steel to meet the target requirements, then carrying out titanium alloying, and tapping after argon blowing and stirring;
(4) adopting LF to adjust the temperature, and tapping after meeting the time and flow standards of hard blowing and soft blowing;
(5) and (4) continuous casting.
In the continuous casting, the taper of the crystallizer is 1.6-1.63%, the water flow of the first cold wide surface is 2070-2130L/min, the water flow of the first cold narrow surface is 265-295L/min, the water flow of the foot roll narrow surface is 25-28L/min, and the water flow of the second cold ratio is 0.40-0.43L/kg.
According to the production method of the iron-nickel-based alloy continuous casting billet for the precise strip steel, the tapping temperature of the intermediate frequency furnace is 1580-minus-one 1620 ℃, the tapping temperature of the AOD is 1570-minus-one 1600 ℃, and the tapping temperature of the LF is 1475-minus-one 1485 ℃.
According to the production method of the iron-nickel-based alloy continuous casting billet for the precise strip steel, the reduction slag charge comprises the following steps: 900kg of lime 600-; c in fluorite is less than or equal to 0.05 percent, and SiO in fluorite2≤1.5％，CaF2≥92％。
The production method of the iron-nickel-based alloy continuous casting billet for the precise strip steel has the advantages that after secondary slag regulation, the ternary alkalinity R (CaO/(SiO) of the steel slag2+Al2O3) 2.2 to 2.5, in the steel slag, (MnO + Cr)2O3+ FeO) content is less than or equal to 0.5%.
According to the production method of the iron-nickel-based alloy continuous casting billet for the precise strip steel, the raw material of titanium alloying is return scraps produced by processing titanium alloy, the titanium content is more than or equal to 88 percent, and the N is less than or equal to 300 ppm.
According to the production method of the iron-nickel-based alloy continuous casting billet for the precise strip steel, molten steel during intermediate frequency furnace tapping comprises the following steps: 2.5-3.5% of C, 24-27% of Cr and 25-28% of Ni.
In the production method of the iron-nickel-based alloy continuous casting billet for the precision strip steel, the hard blowing treatment is carried out in the LF furnace at the temperature of 1525-.
According to the production method of the iron-nickel-based alloy continuous casting billet for the precise strip steel, the continuous casting is carried out by adopting a vertical slab caster.
On the other hand, the invention also provides an iron-nickel-based alloy continuous casting billet for the precision strip steel, which is prepared by the production method of the iron-nickel-based alloy continuous casting billet for the precision strip steel.
The technical scheme of the invention has the following beneficial effects:
(1) the production method of the iron-nickel-based alloy continuous casting billet for the precise strip steel can improve the efficiency and reduce the cost. In the prior art, only products with the single weight of less than 7 tons can be produced by adopting special smelting, the specification is small, the special smelting cost is high, the single weight of die casting does not exceed 9 tons, the die casting yield is low, and the two can not meet the requirements of wide-width precise foils. The original continuous casting process has many production accidents caused by nodulation and fish caking of a crystallizer, and only single-furnace casting can be carried out. The production method of the invention can continuously produce more than 4 continuous casting. The metal yield is improved by more than 15 percent, the cost of per ton of steel is reduced by more than 2 ten thousand yuan, the maximum specification can be produced to be 1.28m wide, and the single weight is more than 15 tons.
(2) The iron-nickel base alloy continuous casting billet for the precise strip steel has high product quality. In the prior art, the die casting quality is unstable, steel leakage and other accidents are more in the continuous casting production process, and the casting blank has serious edge cracking and heavy skin after rolling due to cleanliness, low-power defects and other reasons. According to the iron-nickel-based alloy continuous casting billet for the precision strip steel, O in the steel is reduced to below 15ppm, N is reduced to below 90ppm, H is reduced to below 3.5ppm, rolling edge cracks and heavy skin defects are eliminated, and precision rolling is realized to below 0.3 mm.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a flow chart of the production process of the iron-nickel base alloy continuous casting billet for the precision strip steel.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
The terms "the," "said," "an," and "an" as used herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. In addition, all ranges disclosed herein are inclusive of the endpoints and independently combinable.
The technical conception of the invention is as follows: the method adopts an intermediate frequency furnace to melt low-cost raw materials (high chromium, nickel iron and the grade steel return waste), ensures high yield of noble metal chromium and nickel, utilizes high carbon distribution of the intermediate frequency furnace, denitrifies through dynamic conditions and bubbles generated by large decarbonization amount, and ensures extremely low nitrogen content so as to ensure the cleanliness of casting blanks. The method has the advantages that the kinetic condition of strong stirring of the AOD furnace and the corresponding metallurgical function are utilized to carry out refining functions such as decarburization, component adjustment, degassing (deoxidation, denitrification and dehydrogenation), inclusion removal and the like, meanwhile, the AOD furnace entering molten steel components are optimized, cold materials such as nickel iron, chromium iron and the like are added into the AOD furnace to carry out less steel mixing, meanwhile, the measure of increasing the steel tapping amount is adopted to reduce the manufacturing cost of the smelting process, a titanium alloy processing return corner material block (containing more than or equal to 88 percent of Ti, less than or equal to 300ppm of N, and the balance of Al and other impurities) is utilized to carry out titanium alloying, the lowest N content in steel is realized, and the influence of titanium nitride precipitation on continuous casting and product quality in the production process is avoided; LF is used for adjusting temperature and improving cleanliness, and meanwhile, high superheat degree of continuous casting is guaranteed; optimizing a one-cold two-cold model, improving the taper of a crystallizer, continuously casting at low casting speed and optimizing continuous casting process parameters.
Specifically, the production method of the iron-nickel-based alloy continuous casting billet for the precision strip steel comprises the following steps:
(1) melting high chromium, ferronickel and the returned waste of the steel grade by using an intermediate frequency furnace, and adding molten steel into an AOD furnace.
Preferably, the tapping temperature of the intermediate frequency furnace is 1580-1620 ℃.
Preferably, the molten steel discharged from the intermediate frequency furnace includes: 2.5-3.5% of C, 24-27% of Cr and 25-28% of Ni.
The medium frequency furnace high carbon distribution promotes the high viscosity iron-nickel base alloy molten steel to be fully degassed (N, H) through the stirring dynamic condition of decarburization reaction and bubbles, and ensures that the [ N ] in the steel is less than or equal to 90 ppm.
Wherein, the steel output of the intermediate frequency furnace is 35-38 tons, the Cr component is high in proportion and the nickel component is low in proportion during the material proportioning calculation, and the AOD, the ferronickel and a proper amount of ferrochrome are utilized to increase the molten steel by 30-50%.
Compared with the conventional electric furnace process, the invention adopts the intermediate frequency furnace to improve the Cr yield by more than 2 percent and improve the Ni yield by more than 0.5 percent.
(2) Adding alloy into AOD to adjust molten steel components, decarburizing to target components, adding aluminum pills for reduction, reducing and slagging off, and adding reducing slag charge for secondary slag adjustment.
Wherein the alloy includes, but is not limited to, ferronickel, ferrochrome.
Preferably, the adding amount of the molten steel in the AOD furnace is 32-36 tons, oxygen blowing, decarburization and temperature rising are carried out, and meanwhile, ferronickel, ferrochrome and other alloys are added for component adjustment.
Preferably, during reduction in the AOD furnace, the reduction is carried out in a mode of adding aluminum pills into a high-position bin, the adding amount is 1.2t-1.8t according to the reduction requirement, the slag skimming amount after reduction is more than or equal to 90%, and simultaneously, the reduction slag is added for secondary slag mixing.
Further preferably, the reducing slag includes: 900kg of lime 600-2+Al2O3) 2.2 to 2.5, in the steel slag, (MnO + Cr)2O3+ FeO) content is less than or equal to 0.5%.
The lime contains less than or equal to 0.02 percent of C and more than or equal to 92 percent of CaO; c in fluorite is less than or equal to 0.05 percent, and SiO in fluorite2≤1.5％，CaF2Not less than 92 percent. Thereby controlling the contents of carbon and silicon in the steel.
(3) Adding aluminum to adjust the components of the molten steel, then carrying out titanium alloying, blowing argon and stirring, and then tapping.
Preferably, the alloying of titanium is carried out 3 minutes after the addition of aluminum
In order to ensure the yield of titanium, reduce secondary pollution of molten steel and realize the lowest N content in steel, the return leftover material processed by titanium alloy is utilized for alloying titanium, the titanium alloy block is added, argon is blown for 4-8min for tapping, and the tapping temperature is controlled at 1570-.
Wherein, in the return leftover material processed by the titanium alloy, the titanium content is more than or equal to 88 percent, and the N is less than or equal to 300 ppm.
Preferably, argon blowing and emptying are carried out on the tapping ladle for 3min before tapping, and meanwhile, an argon blowing pipeline with holes is used for carrying out argon sealing protection on the periphery of the ladle, so that secondary oxidation and nitrogen increase of tapping are prevented.
(4) And (4) adopting LF (ladle furnace) to adjust the temperature, and tapping after the hard blowing time and the soft blowing time and the flow rate meet the standards.
Preferably, in the LF furnace, the hard blowing treatment is started at 1525-1530 ℃, the hard blowing time is controlled to be 8-15min, and the soft blowing time is controlled to be 10-15 min.
Preferably, the tapping temperature of the LF is 1475-1485 ℃.
(5) And (4) continuous casting.
Optionally, the continuous casting is performed by a vertical slab caster to prevent triangular zone cracks and narrow-face subcutaneous cracks from appearing on the macroscopic scale.
Wherein, the continuous casting of the large ladle is started, the molten steel amount of the tundish is controlled to be 14-16 tons, the superheat degree of the molten steel of the tundish is controlled to be 48-55 ℃, and good slagging effects of the casting slag and the casting powder are ensured. Smooth casting of the crystallizer is guaranteed, cold steel is prevented, the performance of the casting powder and the lubrication of the blank shell are influenced, and casting risk is increased. And opening a tundish stopper rod mechanism to start casting steel into the crystallizer, starting a continuous casting machine to carry out steel drawing after tundish casting is carried out for 45-70s, and controlling the blank drawing speed to be 0.5-0.6 m/min.
Through research and summary on the solidification shrinkage characteristics of the iron-nickel base alloy, the inventor provides a crystallizer taper, a first cooling mode, a second cooling mode and a casting blank slow cooling mode which are suitable for the iron-nickel base alloy, and specifically comprises the following steps: in the continuous casting, the taper of the crystallizer is 1.6-1.63 percent, the water flow of a cold wide surface is 2070-. After cutting, the high-temperature casting blank is forbidden to contact with water, is spread, stored and slowly cooled for 12-18h, and is reorganized for subsequent processing processes such as coping, rolling and the like.
The method for producing the iron-nickel-based alloy continuous casting billet for the precise strip steel solves the problems of high raw material cost, high component control difficulty, more continuous casting production accidents, unstable quality and small finished product specification by developing and optimizing the process combination of the intermediate frequency furnace, the AOD, the LF and the vertical slab caster, realizes the continuous casting of more than 4 furnaces, does not need an electromagnetic stirring device in the process, improves the metal yield by more than 15 percent, reduces the cost per ton steel by more than 2 ten thousand yuan, can produce the width of 1.28m to the maximum, can be rolled to the minimum thickness of less than 0.3mm, has good surface quality, and well meets the use requirements of customers.
On the other hand, the invention also provides an iron-nickel-based alloy continuous casting billet for the precision strip steel, which is prepared by the production method of the iron-nickel-based alloy continuous casting billet for the precision strip steel.
According to the iron-nickel-based alloy continuous casting billet for the precision strip steel, O in the steel is reduced to below 15ppm, N is reduced to below 90ppm, H is reduced to below 3.5ppm, rolling edge cracks and heavy skin defects are eliminated, and precision rolling is realized to below 0.3 mm.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. Experimental procedures without specifying specific conditions in the following examples were carried out according to conventional methods and conditions.
The embodiment is carried out on a vertical slab caster with the specification of 180 multiplied by 1280, the steel grade is N08800, and the finished product comprises the following chemical components in percentage by mass:
the component C is less than or equal to 0.10; si is less than or equal to 1.0; mn is less than or equal to 1.50; p is less than or equal to 0.045; s is less than or equal to 0.015; cr is 18.00-23.00; ni is 30.00-35.00; al is 0.15-0.69; ti is 0.15-0.60; n is less than or equal to 0.02; cu is less than or equal to 0.75; the balance being iron and unavoidable impurities.
1. According to the intermediate frequency furnace, 2.5-3.5% of steel tapping C, 24-27% of steel tapping Cr and 25-28% of steel tapping Ni are subjected to batching and smelting by adopting high chromium, ferronickel and returned waste of the steel grade, the steel tapping amount is 36 tons, the steel tapping temperature is 1590 ℃, the steel tapping C is 3.2%, the steel tapping Cr is 25.5% and the steel tapping Ni is 25.6%.
2. And performing normal smelting after adding the AOD, performing molten steel increasing by adopting alloys such as ferronickel, proper amount of ferrochrome and the like in the process, performing reduction by adding 1.5t of aluminum pills according to calculation, slagging off about 92%, adding 800kg of low-carbon lime for secondary slag adjustment, adding 350kg of low-carbon low-silicon fluorite according to slag conditions, adding 50kg of aluminum pills after adjusting slag of 3.5kg of aluminum powder of steel per ton, performing aluminum component adjustment, adding 120kg of titanium alloy blocks after 3min, performing argon blowing for 4min to perform tapping after the yield is calculated according to 97%, performing argon blowing evacuation on the steel ladle for 3min before tapping, performing argon sealing protection on the periphery of the steel ladle in the tapping process, wherein the tapping temperature is 1582 ℃, the tapping amount is 47t, and the molten steel increasing proportion is 30.55%. The ternary alkalinity R of the reducing slag is 2.3, and the (MnO + Cr) in the slag2O3+ FeO) content 0.42%.
3. And (4) after LF is in place, measuring the temperature and adjusting the temperature, starting hard blowing at 1528 ℃ for 9min, soft blowing for 12min, and tapping at 1488 ℃.
4. The continuous casting is carried out by adopting a vertical slab continuous casting machine, a large ladle is cast, the amount of the tundish molten steel is controlled at 15 tons, the superheat degree of the tundish molten steel is 52 ℃, a tundish stopper rod mechanism is opened to begin casting steel into a crystallizer, the continuous casting machine is started to carry out steel drawing after the tundish casting is carried out for 52s, and the blank drawing speed is controlled at 0.55 m/min.
6. The conicity of the continuous casting crystallizer is 1.61 percent, the water flow of a first cold wide surface is 2100L/min, the water flow of a first cold narrow surface is 280L/min, the temperature difference of inlet water and outlet water of the crystallizer is 6-7 ℃, the water flow of a foot roll narrow surface is 26L/min, the water flow of a second cold ratio is set according to 0.41L/kg, a high-temperature casting blank is not contacted with water after cutting, and after being spread and stored for slow cooling for 15 hours, the structure is ground, rolled and other subsequent processing processes.
7. Tapping [ O ] is 10ppm, [ N ] is 76ppm, and [ H ] is 2.9ppm, no nodulation or fish formation occurs in the continuous casting process, the casting blank grinding and subsequent rolling quality is normal, and the finished product of 0.2mm is delivered to customers to meet the requirements.
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions that are equivalent to these embodiments are deemed to be within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.
Claims (10)
1. A production method of an iron-nickel base alloy continuous casting billet for precise strip steel is characterized by comprising the following steps:
(1) melting high chromium, ferronickel and the steel grade return waste by using an intermediate frequency furnace, and adding molten steel into an AOD furnace;
(2) adding alloy into AOD to adjust the components of molten steel, blowing oxygen to decarbonize until the target components are reached, adding aluminum pills to reduce, reducing and slagging off, and adding reducing slag charge to carry out secondary slag mixing;
(3) adding aluminum to adjust the components of the molten steel, then carrying out titanium alloying, blowing argon and stirring, and then tapping;
(4) adopting LF to adjust the temperature, and tapping after the flow and time of hard blowing and soft blowing meet the standards;
(5) and (4) continuous casting.
2. The method for producing the continuous casting billet of the iron-nickel-based alloy for the precision strip steel as claimed in claim 1, wherein in the continuous casting, the taper of the crystallizer is 1.6-1.63%, the water flow of the first cold wide surface is 2070-2130L/min, the water flow of the first cold narrow surface is 265-295L/min, the water flow of the foot roller narrow surface is 25-28L/min, and the water flow of the second cold ratio is 0.40-0.43L/kg.
3. The method for producing the continuous casting billet of the iron-nickel-based alloy for the precision strip steel as claimed in claim 1, wherein the tapping temperature of the intermediate frequency furnace is 1580-.
4. The method for producing the iron-nickel-based alloy continuous casting billet for the precision strip steel as claimed in claim 1, wherein the reducing slag comprises: 900kg of lime 600-; the lime contains C not more than 0.02% and CaO not less than92 percent; c in fluorite is less than or equal to 0.05 percent, and SiO in fluorite2≤1.5％，CaF2≥92％。
5. The method for producing the iron-nickel-based alloy continuous casting slab for the precision strip steel as claimed in claim 1, wherein the ternary basicity R (CaO/(SiO)) of the steel slag is obtained after secondary slag conditioning2+Al2O3) 2.2 to 2.5, in the steel slag, (MnO + Cr)2O3+ FeO) content is less than or equal to 0.5%.
6. The method for producing the iron-nickel-based alloy continuous casting slab for the precision steel strip as claimed in claim 1, wherein the alloy comprises: nickel iron, ferrochromium; the raw material of the titanium alloy is return leftover material processed by the titanium alloy.
7. The method for producing the iron-nickel-based alloy continuous casting billet for the precision steel strip as claimed in claim 1, wherein the molten steel during the tapping of the intermediate frequency furnace comprises the following steps: 2.5-3.5% of C, 24-27% of Cr and 25-28% of Ni.
8. The method for producing the continuous casting slab of the iron-nickel base alloy for the precision strip steel as claimed in claim 1, wherein the hard blowing treatment is started at 1525 ℃ -.
9. The method for producing the iron-nickel based alloy continuous casting slab for the precision steel strip as claimed in claim 1, wherein the continuous casting is carried out by using a vertical slab caster.
10. An iron-nickel-based alloy continuous casting billet for precision steel strip, which is characterized by being prepared by the production method of the iron-nickel-based alloy continuous casting billet for precision steel strip as claimed in any one of claims 1 to 9.
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