CN115740000A - Production method for preventing edge crack of rare-earth-containing iron-chromium-aluminum hot-rolled steel coil - Google Patents
Production method for preventing edge crack of rare-earth-containing iron-chromium-aluminum hot-rolled steel coil Download PDFInfo
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Abstract
The invention belongs to the technical field of hot processing of steel coils containing rare earth iron, chromium and aluminum, and particularly relates to a production method for preventing edge cracks of hot rolled steel coils containing rare earth iron, chromium and aluminum, which comprises the following steps: (1) Transferring the iron-chromium-aluminum plate blank containing the rare earth to a heating furnace for heating in a red-conveying hot charging mode; (2) Carrying out rough rolling on the rare earth-containing iron-chromium-aluminum plate blank, wherein the deformation rate of each pass is 12-16%, 18-22%, 24-28%, 26-30%, 28-32% and 30-34% after 7 passes of rough rolling; (3) After rough rolling is finished, heating compensation is carried out on the edge of the intermediate billet; (4) And (3) obtaining the hot rolled steel coil containing the rare earth iron, chromium and aluminum by finish rolling and coiling. The production method for preventing the edge crack of the rare earth iron-chromium-aluminum-containing hot rolled steel coil greatly reduces the problem of the edge crack of the rare earth iron-chromium-aluminum-containing hot rolled steel coil, can produce the hot rolled steel coil with the rare earth content of 0.02-0.12%, the thickness of 3.0-3.5mm and the width of 1000-1300mm, prevents the edge crack of the hot rolled steel coil, reduces the fracture risk after uncoiling, and ensures the smooth operation of subsequent production.
Description
Technical Field
The invention belongs to the technical field of hot processing of steel coils containing rare earth iron, chromium and aluminum, and particularly relates to a production method for preventing edge cracks of hot rolled steel coils containing rare earth iron, chromium and aluminum.
Background
The Fe-Cr-Al alloy is an economical electrothermal alloy, is widely applied to the fields of electric heating, traffic, environmental protection, household appliances and the like, and plays an important role in national economy. The high aluminum content can improve the resistivity, effectively convert electric energy into heat energy and save electric heating materials. Meanwhile, the iron-chromium-aluminum alloy does not contain noble metal Ni, and the cost is about 30 percent lower than that of nickel-chromium electrothermal alloy and stainless steel materials. The iron-chromium-aluminum alloy has the characteristics of good resistance performance, high temperature resistance, strong oxidation resistance, high cost performance and the like, the maximum use temperature can reach 1400 ℃, the maximum resistivity is 1.60 mu omega cm, and the economic price provides convenient conditions for large-scale use of the iron-chromium-aluminum alloy.
Because the solidification structure is a single ferrite structure, the iron-chromium-aluminum is rapidly solidified into a solid state from high-temperature molten steel in the continuous casting process, and the iron-chromium-aluminum is easy to form thick columnar crystals, so that the structure toughness is poor. With the reduction of the temperature of the casting blank, even if the casting blank is slowly cooled, fine cracks are easily formed among coarse columnar crystal branches, and the fine cracks can be expanded under the action of thermal expansion and cold contraction stress, so that the hot processing of the casting blank into a steel plate is influenced. The edge of the cast blank is particularly obvious, and edge cracking can occur even in the subsequent hot rolling process.
A large number of experimental observations show that the addition of rare earth into iron-chromium-aluminum alloy can improve the thermal stability, high-temperature strength and creep resistance and enhance the oxidation resistance. The rare earth La and Ce elements accounting for 0.02 to 0.12 percent are added into the iron-chromium-aluminum plate strip, so that the oxidation resistance of the material at a high-temperature stage can be obviously improved. However, the rare earth elements are added, because the atomic radius is larger, the pinning effect is obvious, the iron-chromium-aluminum structure is inevitably refined, the dynamic recovery is delayed, the hot rolling deformation speed cannot be kept up with, and the hot rolling edge cracking phenomenon is aggravated.
In the prior art, in order to improve the thermal deformation condition of rare earth-containing iron, chromium and aluminum, a furnace coil rolling process is adopted to produce a hot rolled steel coil. The furnace coil hot rolling can keep the temperature of the steel coil in the furnace, reduce the temperature drop speed and ensure the rolling in the optimal plastic interval. But the process is severely restricted by rolling equipment, so that the energy consumption is high, the efficiency is low, and the yield is restricted to be improved.
Therefore, a new production method needs to be developed based on hot continuous rolling equipment aiming at rare earth-containing iron, chromium and aluminum, and the problem of hot rolling edge cracking is solved.
Disclosure of Invention
The invention aims to provide a production method for preventing the edge crack of a hot-rolled steel coil containing rare earth iron, chromium and aluminum aiming at the defects of the prior art.
Specifically, the production method for preventing the edge crack of the hot rolled steel coil containing the rare earth iron, chromium and aluminum comprises the following steps:
(1) Transferring the rare earth-containing iron-chromium-aluminum plate blank to a heating furnace for heating in a red-conveying hot charging mode;
(2) Carrying out rough rolling on the rare earth-containing iron-chromium-aluminum plate blank, wherein the deformation rate of each pass is 12-16%, 18-22%, 24-28%, 26-30%, 28-32% and 30-34% after 7 passes of rough rolling;
(3) After rough rolling is finished, heating compensation is carried out on the edge of the intermediate billet;
(4) And (3) obtaining the hot rolled steel coil containing the rare earth iron, chromium and aluminum by finish rolling and coiling.
In the production method for preventing the edge crack of the hot-rolled steel coil containing the rare earth iron, chromium and aluminum, the hot-feeding and hot-charging adopt a heat preservation vehicle to transport the slab containing the rare earth iron, chromium and aluminum, the time from the continuous casting to the charging is not more than 12 hours, and the surface temperature of the slab before the charging is not less than 200 ℃.
The production method for preventing the edge crack of the hot rolled steel coil containing the rare earth iron, chromium and aluminum comprises a heat recovery section, a preheating section, a first heating section, a second heating section and a soaking section, wherein the temperatures are respectively 500-700 ℃, 950-1050 ℃, 1080-1120 ℃, 1130-1170 ℃ and 1140-1180 ℃, and the times are respectively 60-70min, 40-50min, 35-45min, 30-40min and 25-30min.
In the production method for preventing the edge crack of the hot rolled steel coil containing the rare earth iron, chromium and aluminum, the heating compensation is carried out by adopting the edge heater, and the temperature compensation is controlled within the range of 20-30 ℃.
According to the production method for preventing the edge crack of the hot rolled steel coil containing the rare earth iron, chromium and aluminum, the finish rolling comprises 7 passes, and the deformation rate of each pass is 36-40%, 35-38%, 32-35%, 24-27%, 22-25%, 16-19% and 8-11%.
According to the production method for preventing the edge crack of the rare earth-containing iron-chromium-aluminum hot rolled steel coil, the coiling temperature is controlled to be 300-400 ℃.
The production method for preventing the edge crack of the hot-rolled steel coil containing the rare-earth iron, chromium and aluminum comprises the following steps of: 0 yarn C is less than or equal to 0.08 percent, 0 yarn Si is less than or equal to 0.5 percent, 0 yarn Mn is less than or equal to 0.5 percent, 0 yarn P is less than or equal to 0.025 percent, 0 yarn S is less than or equal to 0.020 percent, 0 yarn N is less than or equal to 0.03 percent, 13.0 percent less than Cr is less than or equal to 21.0 percent, 3.0 percent less than or equal to 6.0 percent of Al, 0 yarn Ti is less than or equal to 0.30 percent, 0 yarn Nb is less than or equal to 0.15 percent, 0.02 percent less than or equal to 0.12 percent, and the balance is Fe and inevitable impurities.
According to the production method for preventing the edge crack of the rare earth-containing iron-chromium-aluminum hot rolled steel coil, the thickness of the rare earth-containing iron-chromium-aluminum alloy plate blank is 180-200mm, and the length is 7500-8500mm; the thickness of the intermediate blank after rough rolling is 27-30mm, and the thickness of the steel strip after finish rolling is 3.0-3.5mm.
In the production method for preventing the edge crack of the hot rolled steel coil containing the rare earth iron, chromium and aluminum, the rough rolling temperature is 1040-1100 ℃; the finish rolling temperature of the finish rolling is 900-940 ℃.
According to the production method for preventing the edge crack of the hot rolled steel coil containing the rare-earth iron, chromium and aluminum, the total furnace standing time of the slab containing the rare-earth iron, chromium and aluminum in the heating furnace is 10-12min/10mm in thickness.
The technical scheme of the invention has the following beneficial effects:
(1) The production method for preventing the edge crack of the rare earth iron-chromium-aluminum-containing hot rolled steel coil greatly reduces the problem of the edge crack of the rare earth iron-chromium-aluminum-containing hot rolled steel coil, can produce the hot rolled steel coil with the rare earth content of 0.02-0.12%, the thickness of 3.0-3.5mm and the width of 1000-1300mm, prevents the edge crack of the hot rolled steel coil, reduces the fracture risk after uncoiling, and ensures the smooth operation of subsequent production;
(2) The production method for preventing the edge crack of the rare earth-containing iron-chromium-aluminum hot rolled steel coil breaks through the restriction of rolling equipment, so that the hot continuous rolling is possible to stably produce the rare earth-containing iron-chromium-aluminum hot rolled steel coil with the thickness of 3.0-3.5mm and the width of 1000-1300 mm;
(3) The production method for preventing the edge crack of the hot rolled steel coil containing the rare earth iron, chromium and aluminum avoids the subsequent trimming production cost, improves the yield and greatly improves the stability of the product performance.
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 photograph of a 3.0mm thick 0Cr20Al6RE hot rolled steel coil edge produced according to the method of the present invention.
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.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range-describing features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein.
Aiming at the characteristics of the rare earth-containing iron-chromium-aluminum steel and the difficulty of the production process of the hot rolled steel coil, the invention realizes the hot continuous rolling of the rare earth-containing iron-chromium-aluminum plate blank by the measures of hot charging red feeding, heating temperature and time control, rough rolling and finish rolling deformation rate regulation, edge heater utilization and the like, solves the problems of uncoiling fracture, edge crack and the like of the rare earth-containing iron-chromium-aluminum hot rolled steel coil, and produces the hot rolled coil with the specification of 3.0.5 mm and qualified surface and performance.
The rare earth-containing iron, chromium and aluminum comprises the following components in percentage by weight: 0 yarn C is less than or equal to 0.08 percent, 0 yarn Si is less than or equal to 0.5 percent, 0 yarn Mn is less than or equal to 0.5 percent, 0 yarn P is less than or equal to 0.025 percent, 0 yarn S is less than or equal to 0.020 percent, 0 yarn N is less than or equal to 0.03 percent, 13.0 percent is less than or equal to 21.0 percent, 3.0 percent is less than or equal to 6.0 percent of Al, 0 yarn Ti is less than or equal to 0.30 percent, 0 yarn Nb is less than or equal to 0.15 percent, 0.02 percent is less than or equal to 0.12 percent, and the balance is Fe and inevitable impurities. Wherein RE is one or more of La, ce, Y and Ha elements.
Specifically, the production method for preventing the edge crack of the rare earth-containing iron-chromium-aluminum hot rolled steel coil comprises the following steps:
(1) Hot charging red conveying of rare earth-containing iron-chromium-aluminum plate blank
The rare earth iron chromium aluminum-containing slab has developed columnar crystals due to high Al content, and the brittleness of the cooled slab is very high. If the slab is cooled down, the thermal stress causes the micro cracks to propagate into macro cracks, particularly edge portions, which affect hot working, and these cracks are further propagated into edge crack defects during hot rolling. Therefore, the hot charging and red delivery of the heat preservation vehicle are required in the circulation process of the slab, the time from the end of continuous casting to the charging does not exceed 12 hours, and the surface temperature of the slab before the charging is not lower than 200 ℃.
As a ferrite structure, the iron-chromium-aluminum size effect is obvious, namely the toughness and brittleness performance is related to the section thickness. In order to improve the toughness of the casting blank, the thickness of the casting blank is controlled to be 180-200mm, and the width of the casting blank is still kept to be 1000-1300mm. The length is limited to 7500-8500mm in consideration of the problem of the temperature drop thermoplasticity drop in the subsequent hot rolling process.
(2) Loading the rare earth-containing iron-chromium-aluminum plate blank into a heating furnace for heating
The iron, chromium and aluminum crystal grains are easy to grow at high temperature and are not suitable for being heated at high temperature for a long time, so the temperature distribution of the heating furnace adopts a heating scheme of longer low-temperature section time and shorter high-temperature section time, namely five heating sections of the heating furnace, and the temperatures of the five heating sections are respectively a heat recovery section, a preheating section, a first heating section, a second heating section and a soaking section from low to high. Wherein the heat recovery section is heated by using the recovered flue gas of the front high-temperature section, the furnace temperature of the region is 500-700 ℃, and the time is 60-70min, so that the temperature rise amplitude of the blank is small, and the heating stress cannot be generated; starting a burner at the preheating section for heating, and controlling the furnace temperature at 950-1050 ℃ for 40-50min; heating to 1080-1120 deg.c in the first heating section for 35-45min; the second heating section starts to raise the temperature of the furnace to 1130-1170 ℃ for 30-40min; soaking at 1140-1180 deg.C for 25-30min to ensure 10-12min/10mm thickness (i.e. 10 12min per 10mm thickness of casting blank).
The heating process realizes that the temperature of the blank reaches more than 1140 ℃, and the time of the high-temperature section is less than 70min, thereby not only ensuring the heating uniformity of the blank, but also reasonably controlling the time of the high-temperature section and preventing the heating defect of the blank.
(3) Rough rolling is carried out on the slab containing the rare earth iron chromium aluminum
The rare earth-containing iron, chromium and aluminum has poor thermoplasticity, and a low-speed and small-deformation rolling scheme is adopted for realizing smooth rolling. The conventional iron-chromium-aluminum is rolled by five passes, the deformation rate of each pass is high, the deformation rate resistance is high, the thermoplasticity of the rare earth-containing iron-chromium-aluminum is difficult to adapt to the large deformation rate, 7 passes are added for the purpose, the rolling deformation rate of each pass is optimized to be 12-16%, 18-22%, 24-28%, 26-30%, 28-32% and 30-34%, the thickness of an intermediate blank is rolled to be 27-30mm, and the rough rolling temperature is 1040-1100 ℃.
In the rough rolling process, because of production at room temperature, the slab is always cooled, the edge is particularly obvious, and the temperature of the edge of the intermediate slab after 7-pass rolling is 20-30 ℃ lower than that of the central position. If the edge of the plate blank has micro cracks, the micro cracks can be rapidly expanded and the edge cracks are more prominent under the action of tension in the subsequent finish rolling process, so that an edge heater is adopted for compensating the temperature of 20-30 ℃.
(4) Finish rolling and fast cooling of rare earth-containing iron, chromium and aluminum
Compared with the conventional ferritic stainless steel, the solid solution strengthening of aluminum and rare earth elements is obvious, and the deformation resistance of the rare earth-containing iron, chromium and aluminum is obviously increased. In order to reduce the edge cracking risk, a high-temperature section large deformation and low-temperature section small deformation pre-rolling strategy is adopted for finish rolling, the deformation rate of each pass is 36-40%, 35-38%, 32-35%, 24-27%, 22-25%, 16-19% and 8-11%, the thickness of a corresponding steel strip is 3.0-3.5mm, and the finish rolling temperature is 900-940 ℃.
Wherein, the rough rolling and the finish rolling are both carried out on a hot continuous rolling mill.
(5) Coiling
In order to avoid the brittleness of the rare earth-containing iron-chromium-aluminum steel coil at 475 ℃ and prevent secondary edge cracking caused by the concentration of the low-temperature coiling stress of the strip steel, the coiling temperature is controlled between 300 and 400 ℃.
According to practices, the production method for preventing the edge crack of the hot rolled steel coil containing the rare earth, the iron, the chromium and the aluminum provided by the invention reduces the generation of micro cracks by controlling the circulation time and the temperature, optimizes the temperature of the heating furnace, controls the growth of crystal grains and central perforation by time, and reduces the crack expansion by adopting multi-pass rough rolling, finish rolling and edge heating. As shown in figure 1, the obtained hot-rolled steel coil containing the rare-earth iron, the chromium and the aluminum basically has no cracks, can enter a continuous line annealing and pickling process without trimming, has no strip breakage phenomenon in the production process, and ensures the smooth production.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the invention thereto. Experimental procedures without specifying specific conditions in the following examples were carried out according to conventional methods and conditions.
Example 1
The method takes an iron-chromium-aluminum continuous casting plate blank with the mark of 0Cr18Al4RE as a raw material, and comprises the following chemical components in percentage by mass: c:0.019%, si:0.17%, mn:0.09%, P:0.014%, S:0.001%, cr:17.3%, al:4.3%, ti:0.20%, nb:0.01%, N:0.010%, la:0.04 percent, and the balance of Fe and other inevitable impurities, wherein the specification of the rare earth-containing iron-chromium-aluminum continuous casting plate blank is as follows: 200mm in thickness, 1242mm in width and 8200mm in length.
The method for producing the hot rolled steel coil containing rare earth iron, chromium and aluminum in example 1 includes the following steps:
(1) And (3) conveying the continuous casting slab to a heating furnace by using a thermal insulation vehicle for 11h, wherein the surface temperature of the slab before entering the furnace is 226-248 ℃.
(2) The slab is put into a heating furnace, and the furnace temperature of each section is respectively 600-640 ℃, 1000-1020 ℃, 1090-1110 ℃, 1140-1160 ℃ and 1150-1160 ℃ for 63min, 43min, 42min, 37min and 27min.
(3) Discharging from a furnace, rough rolling at 1040-1060 ℃, rolling for 7 times, wherein the deformation rates are 14%, 19%, 26%, 27%, 28% and 32% respectively, the thickness of the intermediate billet is 29.8mm, and compensating for 22-26 ℃ by using an edge heater.
(4) And (3) carrying out finish rolling at the finish rolling temperature of 900-920 ℃, rolling for 7 times with deformation rates of 38%, 36%, 34%, 26%, 23%, 17% and 10% respectively to obtain a steel strip with the thickness of 3.3mm, and coiling at the coiling temperature of 360-395 ℃.
By using the method for producing the hot-rolled steel coil containing the rare earth, iron, chromium and aluminum in the embodiment 1, no edge crack phenomenon is generated in the process of producing the 0Cr18Al4RE hot-rolled steel coil, and the hot rolling is smooth.
Example 2
The method takes an iron-chromium-aluminum continuous casting plate blank with the mark of 0Cr20Al6RE as a raw material, and comprises the following chemical components in percentage by mass: c:0.022%, si:0.15%, mn:0.09%, P:0.018%, S:0.001%, cr:20.0%, al:5.5%, ti:0.13%, nb:0.13%, N:0.008%, la:0.08 percent, and the balance of Fe and other inevitable impurities, and the specification of the rare earth-containing iron-chromium-aluminum continuous casting slab is as follows: 180mm in thickness, 1265mm in width and 7800mm in length.
The method for manufacturing the wide steel strip iron-chromium-aluminum alloy hot rolled steel coil of the embodiment 2 includes the steps of:
(1) The continuous casting slab is sent to a heating furnace by a heat preservation vehicle for 10 hours, and the surface temperature of the slab before entering the furnace is 263-297 ℃.
(2) The slab is loaded into a heating furnace, the furnace temperature of each section is 660-680 ℃, 1020-1040 ℃, 1100-1120 ℃, 1150-1170 ℃, 1160-1170 ℃ respectively, and the time is 64min, 46min, 42min, 35min and 28min respectively.
(3) Discharging from a furnace, rough rolling at 1060-1080 ℃, rolling for 7 times, wherein the deformation rates are respectively 13%, 18%, 19%, 25%, 27%, 29% and 31%, the thickness of the intermediate billet is 27.9mm, and the temperature is compensated by using an edge heater for 24-28 ℃.
(4) Performing finish rolling at the finishing temperature of 920-940 ℃, rolling for 7 times with deformation rates of 38%, 36%, 34%, 26%, 24%, 18% and 10% respectively to obtain a steel strip with the thickness of 3.0mm, and coiling at the coiling temperature of 320-360 ℃.
By using the method for producing the hot-rolled steel coil containing the rare-earth iron, chromium and aluminum in the embodiment 2, the process of producing the 0Cr20Al6RE hot-rolled steel coil basically has no cracks, the hot rolling is smooth, and the continuous line annealing and pickling production can be carried out without trimming.
Comparative example 1:
the iron-chromium-aluminum continuous casting slab with the mark of 0Cr18Al4RE is used as a raw material, and comprises the following chemical components in percentage by mass: c:0.020%, si:0.15%, mn:0.09%, P:0.015%, S:0.001%, cr:17.5%, al:4.2%, ti:0.25%, nb:0.01%, N:0.009%, la:0.05 percent, and the balance of Fe and other inevitable impurities, wherein the specification of the continuous casting slab containing the rare earth, the iron, the chromium and the aluminum is as follows: 200mm in thickness, 1276mm in width and 8500mm in length.
The method for producing the rare earth iron-chromium-aluminum-containing hot-rolled steel coil of the comparative example 1 comprises the following steps:
(1) The continuous casting slab is sent to a heating furnace by a heat preserving vehicle for 18h, and the surface temperature of the slab before entering the furnace is 184-193 ℃.
(2) The slab is put into a heating furnace, and the furnace temperature of each section is 580-620 ℃, 1030-1050 ℃, 1100-1120 ℃, 1160-1180 ℃ and 1180-1200 ℃ respectively for 68min, 48min, 43min, 38min and 28min.
(3) Discharging from a furnace, rough rolling, wherein the rough rolling temperature is 1080-1100 ℃, the rough rolling is performed for 5 times, the deformation rates are 20%, 29%, 34%, 37% and 37%, the thickness of the intermediate billet is 29.8mm, and an edge heater is not used.
(4) Performing finish rolling at the finishing temperature of 880-900 ℃ for 7 passes with deformation rates of 32%, 36%, 30%, 25%, 22%, 17% and 13% respectively to obtain a steel strip with the thickness of 3.8mm, and coiling at the coiling temperature of 260-295 ℃.
By using the method for producing the rare earth-containing iron-chromium-aluminum hot rolled steel coil in the comparative example 1, severe edge cracking occurs in the process of producing the 0Cr18Al4RE hot rolled steel coil, and the steel coil can be normally produced only after edge cutting is required in the subsequent cold rolling process.
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 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 for preventing edge cracking of a hot-rolled steel coil containing rare earth iron, chromium and aluminum is characterized by comprising the following steps:
(1) Transferring the iron-chromium-aluminum plate blank containing the rare earth to a heating furnace for heating in a red-conveying hot charging mode;
(2) Carrying out rough rolling on the rare earth-containing iron-chromium-aluminum plate blank, wherein the deformation rate of each pass is 12-16%, 18-22%, 24-28%, 26-30%, 28-32% and 30-34% after 7 passes of rough rolling;
(3) After rough rolling is finished, heating and compensating the edge of the intermediate billet;
(4) And (3) obtaining the hot rolled steel coil containing the rare earth iron, chromium and aluminum by finish rolling and coiling.
2. The method according to claim 1, wherein the red-sending hot charging uses a thermal insulation truck to transport the rare earth-containing iron-chromium-aluminum slab, the time from the end of continuous casting to charging does not exceed 12 hours, and the surface temperature of the slab before charging does not fall below 200 ℃.
3. The method of claim 1, wherein the furnace comprises a heat recovery section, a preheating section, a heating section, a second heating section, and a soaking section at 500-700 ℃, 950-1050 ℃, 1080-1120 ℃, 1130-1170 ℃, 1140-1180 ℃ for 60-70min, 40-50min, 35-45min, 30-40min, and 25-30min, respectively.
4. The method of claim 1, wherein the heating compensation is performed using an edge heater, and the temperature compensation is controlled within a range of 20-30 ℃.
5. The method of claim 1, wherein the finish rolling comprises 7 passes, and the deformation rate of each pass is 36% -40%, 35% -38%, 32% -35%, 24% -27%, 22% -25%, 16% -19%, and 8% -11%.
6. The method according to claim 1, wherein the temperature of the coiling is controlled at 300-400 ℃.
7. The method of claim 1, wherein the rare earth-containing iron-chromium-aluminum alloy comprises, in mass percent: 0 yarn C is less than or equal to 0.08 percent, 0 yarn Si is less than or equal to 0.5 percent, 0 yarn Mn is less than or equal to 0.5 percent, 0 yarn P is less than or equal to 0.025 percent, 0 yarn S is less than or equal to 0.020 percent, 0 yarn N is less than or equal to 0.03 percent, 13.0 percent < Cr is less than or equal to 21.0 percent, 3.0 percent < Al is less than or equal to 6.0 percent, 0 yarn Ti is less than or equal to 0.30 percent, 0 yarn Nb is less than or equal to 0.15 percent, 0.02 percent < RE is less than or equal to 0.12 percent, and the balance is Fe and inevitable impurities.
8. The method of claim 1, wherein the rare earth-containing ferrochromium alloy slab has a thickness of 180-200mm and a length of 7500-8500mm; the thickness of the intermediate blank after rough rolling is 27-30mm, and the thickness of the steel strip after finish rolling is 3.0-3.5mm.
9. The method according to claim 1, wherein the temperature of the rough rolling is 1040-1100 ℃; the finish rolling temperature of the finish rolling is 900-940 ℃.
10. The method of claim 1, wherein the total residence time of the rare earth-containing ferrochrome aluminum slab in the furnace is 10-12min/10mm thickness.
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