CN113416820A - Method for preventing surface oxidation of cold-rolled high-strength steel plate for automobile during continuous annealing - Google Patents
Method for preventing surface oxidation of cold-rolled high-strength steel plate for automobile during continuous annealing Download PDFInfo
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- CN113416820A CN113416820A CN202110571043.5A CN202110571043A CN113416820A CN 113416820 A CN113416820 A CN 113416820A CN 202110571043 A CN202110571043 A CN 202110571043A CN 113416820 A CN113416820 A CN 113416820A
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- 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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to a method for preventing surface oxidation of an automobile cold-rolled high-strength steel plate during continuous annealing, which comprises the following steps: (1) controlling the annealing atmosphere in the continuous annealing furnace; (2) adjusting the load of the fan; (3) controlling the annealing temperature of each section in the continuous annealing furnace; (4) controlling the running speed of the steel plate; (5) controlling the dew point; (6) controlling a quick cooling section; according to the invention, through optimizing the atmosphere in the continuous annealing furnace, adjusting the load of the fan, controlling the temperature and dew point of each area in the continuous annealing furnace and other relevant process parameters in the continuous annealing process, the oxidation of the surface of the steel plate of the cold-rolled high-strength steel for the automobile in the continuous annealing process is effectively prevented, and the sealing rate of the steel coil caused by the surface oxidation problem of the cold-rolled high-strength steel is reduced from 8% to below 0.3%.
Description
Technical Field
The invention relates to the technical field of cold-rolled high-strength steel plate production, in particular to a method for preventing surface oxidation of an automobile cold-rolled high-strength steel plate during continuous annealing.
Background
With the rapid development of the automobile industry towards light weight, low energy consumption and higher safety performance, in order to meet the requirements, cold-rolled high-strength steel for automobiles is produced, and the steel is also one of the steel types which are intensively researched by various automobile steel production enterprises at present. The cold-rolled high-strength steel for the automobile generally has good ductility, is more suitable for being used as a vehicle body material, and is high-strength steel formed by introducing high-strength structural steel such as martensite steel or bainite steel on the basis of traditional steel and continuously strengthening the performance of the high-strength structural steel.
At present, when the high-strength steel is produced by adopting a continuous annealing furnace, the problem of surface oxidation of a steel plate often occurs, and the main reasons are as follows: (1) the high-strength steel contains higher alloy elements such as Mn, Si and the like, the two elements are easier to generate oxidation reaction with oxygen than a steel plate matrix in the continuous annealing production process, the defect similar to color difference is generated, and the generated oxide is not easy to reduce; although the performance of the steel plate can meet the requirements through related detection of mechanical properties and the like, the surface quality of the steel plate cannot meet the requirements of customers; (2) in the process of producing high-strength steel by adopting a continuous annealing furnace, the requirement on the cooling rate of a rapid cooling section is higher, and a fan with a cooling effect has the phenomenon of large and small load and can also cause the surface of a steel plate to be oxidized; (3) technological parameters of each section of area in the continuous annealing furnace are to be optimized, and the technological parameters mainly comprise the optimization of technological parameters such as temperature, dew point, conductivity and the like of each section in the continuous annealing furnace.
The Chinese patent with the publication number of CN107354424B discloses a zinc evaporation pretreatment process for inhibiting selective oxidation of the surface of a high-strength steel plate, wherein a Zn film with steel base surface resistance to selective oxidation is evaporated on the surface of the high-strength steel plate in a vacuum state before continuous annealing so as to prevent selective oxidation. The Zn film is mainly formed by heating pure Zn to a certain temperature at a high temperature, so that metal Zn generated by desublimation of Zn steam covers the surface of a matrix. The Zn thin film has good film-substrate bonding strength. A Zn film is evaporated on the surface of the steel plate, so that the matrix on the surface of the steel plate is inhibited from being selectively oxidized in the annealing process, and the problem of plating leakage is solved. Although the technical scheme plays a role in protecting the base body from being oxidized, the step of covering the metal Zn generated by desublimation of steam on the surface of the base body needs to be added, so that the production process becomes complicated.
The Chinese patent with the publication number of CN106636576B discloses a method for improving the oxidation color difference defect of a continuous annealing line starting coil, which solves the problem that the oxidation color difference exists in the first ten rolls of rolled steel after the continuous annealing furnace is started to produce, strip steel enters an annealing furnace after being washed by alkali and cleaned and dried, and the temperature rise curve of a high-temperature furnace section is set to be 260-350 ℃; preserving heat for 5-20 hours in the heat preserving furnace section; adjusting the furnace pressure difference of the annealing furnace to be 30-45 Pa; setting the air surplus coefficient of the furnace section of the preheating non-oxidation heating furnace to be 0.90-0.98; wherein, the cooling furnace section still includes the recirculated gas injection cooling section, and the cooling furnace section adjusts the cooling blower output power of recirculated gas injection cooling section according to the temperature stage of difference. The technical scheme is only suitable for the furnace starting stage, and only part of process parameters in the continuous annealing furnace are adjusted.
Chinese patent application with publication number CN111593177A discloses 'an annealing method for preventing selective oxidation of the surface of cold-rolled high-strength steel', which is suitable for cold-rolled high-strength steel with the grade of 980MPa or above; the annealing of the cold-rolled high-strength steel comprises the following control processes: (1) controlling the annealing temperature and the strip steel speed of each section in the continuous annealing furnace; (2) controlling dew points and oxygen contents of all sections in the continuous annealing furnace; (3) controlling a quick cooling section; (4) controlling a water quenching tank; the invention effectively prevents the selective oxidation of the surface of the cold-rolled high-strength steel by controlling the relevant process parameters such as the temperature, the dew point, the conductivity and the like of each section in the continuous annealing furnace. The technical scheme is only suitable for cold-rolled high-strength steel with the strength higher than 980 MPa.
The Chinese patent with the publication number of CN105648178B discloses a control method for the oxidation color of dual-phase steel in a cold rolling continuous annealing procedure, wherein the initial temperature set value of a heating section is lower than a target value by 5-10 ℃; the temperature of the final cooling section is controlled at 100-130 ℃; performing water quenching on the annealed dual-phase steel; the conductivity of the circulating water in the water quenching process is less than 20 +/-10 mu S/cm, the pH value is 8 +/-0.3, and the water temperature is less than 45 ℃. The oxide color control method of the dual-phase steel obviously improves the surface oxide color defect of the dual-phase steel in the continuous annealing process. But the technical scheme only considers the factors of the temperature, the conductivity, the pH value and the like of the final cooling section.
Disclosure of Invention
The invention provides a method for preventing surface oxidation of an automobile cold-rolled high-strength steel plate during continuous annealing, which effectively prevents the surface of the automobile cold-rolled high-strength steel plate from being oxidized in the continuous annealing process by optimizing the atmosphere in a continuous annealing furnace, adjusting the load of a fan, controlling the temperature, dew point and other relevant process parameters of the continuous annealing process in each area of the continuous annealing furnace.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preventing surface oxidation of an automobile cold-rolled high-strength steel plate during continuous annealing is provided, wherein the cold-rolled high-strength steel plate is a steel plate with a pressure of 590MPa or more; the method comprises the following steps:
(1) controlling the annealing atmosphere in the continuous annealing furnace: filling nitrogen into the continuous annealing furnace to ensure that the oxygen content in the furnace is less than 10 ppm;
(2) adjusting the load of a fan in the continuous annealing furnace;
(3) controlling the annealing temperature of each section in the continuous annealing furnace: the temperature of the heating section is 800-810 ℃, the temperature of the soaking section is 800-850 ℃, the temperature of the slow cooling section is 650-700 ℃, the temperature of the fast cooling section is 270-300 ℃, the temperature of the aging section is 280-340 ℃, and the temperature of the final cooling section is 100-120 ℃;
(4) controlling the running speed of the steel plate; controlling the running speed of the steel plate in the furnace area to be 80-120 m/min;
(5) controlling the dew point: the dew point temperature of the atmosphere in the continuous annealing furnace is controlled to be-55 ℃ to-75 ℃;
(6) and (3) control of a fast cooling section: in the fast cooling section, the distance between the steel plate and the bellows of the cooling fan is kept between 25 and 55mm, the protective atmosphere in the furnace is nitrogen and hydrogen, the percentage of the hydrogen content in the protective atmosphere is controlled between 10 and 18 percent, and the flow of the protective gas is controlled between 3200 and 4000Nm2/h。
In the step (2), the work load of a fan in the continuous annealing furnace is adjusted to 2160-2328 kW.
Compared with the prior art, the invention has the beneficial effects that:
(1) by comprehensively controlling continuous annealing process parameters such as annealing temperature, oxygen content in the furnace, fan load, dew point and the like of each section in the continuous annealing furnace, the surface oxidation of the cold-rolled high-strength steel for the automobile in the continuous annealing process is effectively prevented, and the use requirements of customers are met;
(2) the product percent of pass of the cold-rolled high-strength steel for the automobile is greatly improved, the surface quality of the steel plate is improved, and stable and batch production is realized.
(3) The sealing rate of the steel coil caused by the surface oxidation problem of the cold-rolled high-strength steel is reduced from 8% to below 0.3%, and the economic benefit of enterprises is improved.
Detailed Description
The invention relates to a method for preventing surface oxidation of an automobile cold-rolled high-strength steel plate during continuous annealing, wherein the cold-rolled high-strength steel plate is a steel plate with the pressure of above 590MPa level; the method comprises the following steps:
(1) controlling the annealing atmosphere in the continuous annealing furnace: filling nitrogen into the continuous annealing furnace to ensure that the oxygen content in the furnace is less than 10 ppm;
(2) adjusting the load of a fan in the continuous annealing furnace;
(3) controlling the annealing temperature of each section in the continuous annealing furnace: the temperature of the heating section is 800-810 ℃, the temperature of the soaking section is 800-850 ℃, the temperature of the slow cooling section is 650-700 ℃, the temperature of the fast cooling section is 270-300 ℃, the temperature of the aging section is 280-340 ℃, and the temperature of the final cooling section is 100-120 ℃;
(4) controlling the running speed of the steel plate; controlling the running speed of the steel plate in the furnace area to be 80-120 m/min;
(5) controlling the dew point: the dew point temperature of the atmosphere in the continuous annealing furnace is controlled to be-55 ℃ to-75 ℃;
(6) and (3) control of a fast cooling section: in the fast cooling section, the distance between the steel plate and the bellows of the cooling fan is kept between 25 and 55mm, the protective atmosphere in the furnace is nitrogen and hydrogen, the percentage of the hydrogen content in the protective atmosphere is controlled between 10 and 18 percent, and the flow of the protective gas is controlled between 3200 and 4000Nm2/h。
In the step (2), the work load of a fan in the continuous annealing furnace is adjusted to 2160-2328 kW.
The invention relates to a method for preventing surface oxidation of an automobile cold-rolled high-strength steel plate during continuous annealing, which is suitable for automobile cold-rolled high-strength steel with the grade of more than 590MPa, and specifically comprises the following control processes:
(1) controlling the annealing atmosphere in a continuous annealing furnace (simply referred to as a continuous annealing furnace): controlling the oxygen content in the furnace to be less than 10 ppm; the opening degree of the nitrogen diffusion valve is adjusted to 2% -6% from a conventional closed state, the atmosphere in the furnace can be kept in a positive pressure control state through adjustment of the opening degree, better conversion of the atmosphere can be achieved, the atmosphere in the furnace is guaranteed to be purer, and the furnace pressure is kept above 2.8hpa continuously.
(2) Adjusting the load of the fan: the load of a fan in the continuous annealing furnace is set to be 90% -97% (specifically 2160-2328 kW) of the maximum load, so that the fan can fully play a role, and the stable and higher cooling speed is ensured to be provided.
(3) Controlling the annealing temperature of each section in the continuous annealing furnace: the temperature of the heating section is 800-810 ℃, the temperature of the soaking section is 800-850 ℃, the temperature of the slow cooling section is 650-700 ℃, the temperature of the fast cooling section is 270-300 ℃, the temperature of the aging section is 280-340 ℃, and the temperature of the final cooling section is 100-120 ℃.
(4) Controlling the running speed of the steel plate; before the steel plate enters the furnace, the running speed of the steel plate is controlled to be 80-120 m/min in advance in a furnace area, when the steel plate enters the continuous annealing furnace, the speed is not adjusted any more, and the steel plate is adjusted again after exiting the continuous annealing furnace.
The reasonable furnace zone temperature of each section of the continuous annealing furnace and the running speed of the strip steel are set, so that the diffusion of alloy elements in the cold-rolled high-strength steel to the surface of the steel plate can be effectively reduced, and the surface oxidation of the steel plate is prevented.
(5) Controlling the dew point: the dew point is controlled between-55 ℃ and-75 ℃. The dew point in the continuous annealing furnace is a mark of the water content in the protective gas in the furnace, and the reduction of iron oxide on the surface of the steel plate can be influenced by the height of the dew point. By measuring and analyzing the dew point in the furnace, the composition change of the protective gas in the furnace and the reduction state of the surface of the steel plate by hydrogen can be indirectly inferred.
(6) And (3) control of a fast cooling section: after the steel plate enters a rapid cooling section, the distance between the steel plate and a wind box of a cooling fan is controlled to be 25-52 mm, the protective atmosphere in the furnace is nitrogen and hydrogen, the percentage of the hydrogen content in the protective atmosphere is controlled to be 10% -18%, and the flow of the protective gas is controlled to be 3200-4000 Nm2/h。
Through the optimization of the process parameters, the cooling efficiency of the steel plate can be obviously improved, the heat exchange coefficient of mixed gas in the furnace is improved, the cooling capacity of a furnace area is enhanced, and the reducing atmosphere of a rapid cooling section is increased, so that the steel coil sealing rate caused by the problem of surface oxidation of cold-rolled high-strength steel in the oxidation trend of the surface of the steel plate is reduced from 8% to below 0.3%.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. Any person skilled in the art should be able to substitute or change the technical solution of the present invention and its inventive concept within the technical scope of the present invention.
[ examples ] A method for producing a compound
In the embodiment, the technological parameters of the cold-rolled high-strength steel plate in the continuous annealing process are shown in the following table:
| examples | 1 | 2 | 3 | 4 | 5 | 6 |
| Oxygen content/ppm in the furnace | 4 | 3 | 5 | 6 | 5 | 8 |
| Opening degree/degree of nitrogen bleeding valve | 3 | 3 | 5 | 4 | 5 | 4 |
| Fan working load/kW | 2250 | 2300 | 2278 | 2195 | 2230 | 2300 |
| Heating zone temperature/. degree.C | 803 | 805 | 810 | 805 | 804 | 806 |
| temperature/deg.C of soaking zone | 815 | 820 | 835 | 842 | 838 | 848 |
| Temperature of slow cooling section/. degree.C | 685 | 692 | 688 | 695 | 690 | 689 |
| temperature/deg.C of the fast cooling section | 274 | 282 | 286 | 295 | 290 | 285 |
| temperature/DEG C of aging stage | 295 | 310 | 330 | 335 | 328 | 338 |
| temperature/deg.C of final cooling stage | 102 | 115 | 119 | 105 | 108 | 104 |
| Running speed of steel plate/m.s-1 | 85 | 95 | 90 | 112 | 98 | 108 |
| Dew point/. degree.C | -65 | -70 | -62 | -72 | -64 | -68 |
| Distance/mm between bellows and steel plate | 28 | 30 | 32 | 35 | 32 | 40 |
| Content of hydrogen in the rapid cooling stage% | 12 | 15 | 12 | 10 | 13 | 15 |
| Protective gas flow/Nm of fast cooling section2/h | 3550 | 3650 | 3700 | 3720 | 3620 | 3830 |
| Oxidation defect on steel plate surface | Is free of | Is free of | Is free of | Is free of | Is free of | Is free of |
| Percent enclosure% | 0.2 | 0.15 | 0.24 | 0.18 | 0.23 | 0.1 |
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (2)
1. A method for preventing surface oxidation of an automobile cold-rolled high-strength steel plate during continuous annealing is provided, wherein the cold-rolled high-strength steel plate is a steel plate with a pressure of 590MPa or more; characterized in that the method comprises:
(1) controlling the annealing atmosphere in the continuous annealing furnace: filling nitrogen into the continuous annealing furnace to ensure that the oxygen content in the furnace is less than 10 ppm;
(2) adjusting the load of a fan in the continuous annealing furnace;
(3) controlling the annealing temperature of each section in the continuous annealing furnace: the temperature of the heating section is 800-810 ℃, the temperature of the soaking section is 800-850 ℃, the temperature of the slow cooling section is 650-700 ℃, the temperature of the fast cooling section is 270-300 ℃, the temperature of the aging section is 280-340 ℃, and the temperature of the final cooling section is 100-120 ℃;
(4) controlling the running speed of the steel plate; controlling the running speed of the steel plate in the furnace area to be 80-120 m/min;
(5) controlling the dew point: the dew point temperature of the atmosphere in the continuous annealing furnace is controlled to be-55 ℃ to-75 ℃;
(6) and (3) control of a fast cooling section: in the fast cooling section, the distance between the steel plate and the bellows of the cooling fan is kept between 25 and 55mm, the protective atmosphere in the furnace is nitrogen and hydrogen, the percentage of the hydrogen content in the protective atmosphere is controlled between 10 and 18 percent, and the flow of the protective gas is controlled between 3200 and 4000Nm2/h。
2. The method for preventing the surface oxidation of the cold-rolled high-strength steel plate for the automobile during the continuous annealing as claimed in claim 1, wherein in the step (2), the working load of a fan in the continuous annealing furnace is adjusted to 2160 to 2328 kW.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110571043.5A CN113416820A (en) | 2021-05-25 | 2021-05-25 | Method for preventing surface oxidation of cold-rolled high-strength steel plate for automobile during continuous annealing |
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| CN202110571043.5A CN113416820A (en) | 2021-05-25 | 2021-05-25 | Method for preventing surface oxidation of cold-rolled high-strength steel plate for automobile during continuous annealing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115747473A (en) * | 2022-11-01 | 2023-03-07 | 鞍钢股份有限公司 | Cold-rolled high-strength automobile steel surface color difference control method |
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| CN105648178A (en) * | 2016-03-07 | 2016-06-08 | 首钢京唐钢铁联合有限责任公司 | Method for controlling oxide color of dual-phase steel in cold rolling continuous annealing procedure |
| CN106636574A (en) * | 2016-11-11 | 2017-05-10 | 北京首钢冷轧薄板有限公司 | Method and device for removing steel strip oxidation tint |
| CN111218545A (en) * | 2020-02-28 | 2020-06-02 | 鞍钢股份有限公司 | Method for eliminating thermal oxidation of dual-phase steel of continuous annealing unit |
| CN111485177A (en) * | 2020-04-19 | 2020-08-04 | 包头钢铁（集团）有限责任公司 | Low-cost 780 MPa-grade cold-rolled dual-phase steel and production method thereof |
| CN111593177A (en) * | 2020-05-28 | 2020-08-28 | 鞍钢股份有限公司 | Annealing method for preventing selective oxidation of surface of cold-rolled high-strength steel |
-
2021
- 2021-05-25 CN CN202110571043.5A patent/CN113416820A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101892367A (en) * | 2010-07-23 | 2010-11-24 | 中冶南方(武汉)威仕工业炉有限公司 | Air supplying method for protective atmospheres of different hydrogen concentration sections |
| CN105648178A (en) * | 2016-03-07 | 2016-06-08 | 首钢京唐钢铁联合有限责任公司 | Method for controlling oxide color of dual-phase steel in cold rolling continuous annealing procedure |
| CN106636574A (en) * | 2016-11-11 | 2017-05-10 | 北京首钢冷轧薄板有限公司 | Method and device for removing steel strip oxidation tint |
| CN111218545A (en) * | 2020-02-28 | 2020-06-02 | 鞍钢股份有限公司 | Method for eliminating thermal oxidation of dual-phase steel of continuous annealing unit |
| CN111485177A (en) * | 2020-04-19 | 2020-08-04 | 包头钢铁（集团）有限责任公司 | Low-cost 780 MPa-grade cold-rolled dual-phase steel and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115747473A (en) * | 2022-11-01 | 2023-03-07 | 鞍钢股份有限公司 | Cold-rolled high-strength automobile steel surface color difference control method |
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Application publication date: 20210921 |