CN111850392A - Method for improving surface quality of hot-dip galvanized high-strength IF steel automobile outer plate - Google Patents
Method for improving surface quality of hot-dip galvanized high-strength IF steel automobile outer plate Download PDFInfo
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- CN111850392A CN111850392A CN202010572720.0A CN202010572720A CN111850392A CN 111850392 A CN111850392 A CN 111850392A CN 202010572720 A CN202010572720 A CN 202010572720A CN 111850392 A CN111850392 A CN 111850392A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
The invention relates to a method for improving the surface quality of a hot-dip galvanized high-strength IF steel automobile outer plate, wherein the IF steel comprises the following chemical components in percentage by mass: less than or equal to 0.01 wt% of C, less than or equal to 0.03 wt% of Si, less than or equal to 0.9 wt% of Mn, less than or equal to 0.08 wt% of P, less than or equal to 0.025 wt% of S, more than or equal to 0.01 wt% of Alt, less than or equal to 0.12 wt% of Ti, more than or equal to 0.002 wt% of N, less than or equal to 0.09 wt% of Nb, and the balance of Fe. The method provided by the invention can be used for eliminating the defect of orange peel on the deformed hot-galvanized high-strength IF steel, so that the deformed surface quality of the hot-galvanized high-strength IF steel is improved. The high-strength IF steel belongs to ultra-low carbon steel, and the amount of TiC, TiN and TiCN precipitates can be effectively increased by controlling the contents of two microalloy elements of Ti and N on the premise of not increasing the carbon content, so that the aim of fine grain strengthening is fulfilled.
Description
Technical Field
The invention belongs to the field of hot-dip galvanized high-strength IF steel production, and particularly relates to a method for improving the surface quality of a hot-dip galvanized high-strength IF steel automobile outer plate.
Background
With the development of automobiles toward weight reduction and light weight, hot-dip galvanized high-strength IF (Interstitial-Free Steel) Steel sheets having both high strength and ultra-deep drawing performance have been rapidly developed, and are gradually used as automobile outer covers in various automobile factories. However, in the past, the steel grade is only used for the inner plate of the automobile in various automobile factories, and the steel factories only pay attention to the strength grade and the deep drawing property of the steel grade, and the surface quality of the steel grade after deformation is not controlled. The surface quality of the steel plate after the stamping deformation is an extremely important assessment index for the automobile outer plate, which restricts the popularization of the hot-dip galvanized high-strength IF steel on the outer plate, and particularly the hot-dip galvanized high-strength IF steel with the strength level of more than 340MPa has serious orange peel on the deformed surface, as shown in FIG. 2. The electrophoresis process adopted by automobile factories has a thin paint film, and can not cover the orange peel defect on the surface of the deformed steel plate, thereby affecting the appearance and causing certain influence on the use of customers.
The difficulty of controlling the surface quality of the series of steel grades is as follows: steel mills only pay attention to the surface quality of steel plates and coil plating layers before deformation, but do not consider the problem of surface orange peel caused by microstructures after deformation. And after the material is punched and deformed by an automobile factory, the orange peel problem caused by the microstructure is more serious. However, the influence factors on the microstructure of the steel grade are throughout the whole steel making, steel rolling and annealing processes. Most steel mills have a significant and overlarge control range of production parameters of the steel grade, so that the problem of orange peel on the surface after deformation caused by microstructures is prominent. Because the factors influencing the microstructure of the steel are too complex, and the production control parameters of a steel mill are simple and rough, the problem of orange peel after the material is deformed cannot be completely solved, and a large number of parts of an automobile factory are scrapped.
In conclusion, the hot-dip galvanized high-strength IF steel in the prior art generally has the technical problem of surface orange peel defects after deformation.
Disclosure of Invention
The invention aims to provide a method for improving the surface quality of a hot-dip galvanized high-strength IF steel automobile outer panel, which solves or partially solves the technical problem of surface orange peel defect after deformation of the hot-dip galvanized high-strength IF steel and improves the surface quality of the deformed hot-dip galvanized high-strength IF steel automobile outer panel.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for improving the surface quality of a hot-dip galvanized high-strength IF steel automobile outer plate comprises the following chemical components in percentage by mass: less than or equal to 0.01 wt% of C, less than or equal to 0.03 wt% of Si, less than or equal to 0.9 wt% of Mn, less than or equal to 0.08 wt% of P, less than or equal to 0.025 wt% of S, more than or equal to 0.01 wt% of Alt, less than or equal to 0.12 wt% of Ti, more than or equal to 0.002 wt% of N, less than or equal to 0.09 wt% of Nb, and the balance of Fe.
The IF steel comprises the following chemical components in percentage by mass: less than or equal to 0.007 wt% of C, less than or equal to 0.03 wt% of Si, less than or equal to 0.9 wt% of Mn, less than or equal to 0.08 wt% of P, less than or equal to 0.025 wt% of S, more than or equal to 0.01 wt% of Alt, 0.042-0.051 wt% of Ti, 0.0021wt-0.0031 wt% of N, and the balance of Fe and inevitable impurities.
A method for improving the surface quality of a hot-dip galvanized high-strength IF steel automobile outer plate comprises the following steps:
1) when the high-strength IF steel plate blank after rough rolling and heating is subjected to finish rolling, controlling the finish rolling temperature to be 920-950 ℃;
2) when the finish rolling high-strength IF steel plate is curled, controlling the curling temperature to be 700-740 ℃;
3) and (3) uncoiling the high-strength IF steel hot coil for cold rolling to obtain a cold-rolled high-strength IF steel coil, wherein the annealing temperature of the cold-rolled high-strength IF steel coil is controlled to be 800-830 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the method provided by the invention can be used for eliminating the defect of orange peel on the deformed hot-galvanized high-strength IF steel, so that the deformed surface quality of the hot-galvanized high-strength IF steel is improved. In the process of steel-making production, the mass percentages (wt%) of Ti and N in the chemical components of the high-strength IF steel are required to simultaneously meet the following requirements: ti is more than or equal to 0.04wt percent, and N is more than or equal to 0.02wt percent. The high-strength IF steel belongs to ultra-low carbon steel, and the amount of TiC, TiN and TiCN precipitates can be effectively increased by controlling the contents of two microalloy elements of Ti and N on the premise of not increasing the carbon content, so that the aim of fine grain strengthening is fulfilled.
Drawings
FIG. 1 is a flowchart of a method for improving the surface quality of a hot-dip galvanized high-strength IF steel automobile outer panel in an embodiment of the present application;
FIG. 2 is a macro topography diagram of surface orange peel defects after deformation of a hot-dip galvanized high-strength IF steel automobile outer panel in the embodiment of the application;
FIG. 3 is a metallographic structure micrograph of surface orange peel defects after deformation of a hot-dip galvanized high-strength IF steel automobile outer panel in the embodiment of the present application:
FIG. 4 is a microscopic picture of metallographic structure of a steel plate of an automobile outer plate made of hot-dip galvanized high-strength IF steel before improvement in the embodiment of the present application;
FIG. 5a is a macro topography diagram of the surface quality of an automobile outer panel after deformation of a hot-dip galvanized high-strength IF steel after improvement in an embodiment of the application;
FIG. 5b is a micrograph of a metallographic structure of an improved hot-dip galvanized high-strength IF steel automobile outer panel steel plate in the example of the present application;
FIG. 6a is a macro topography diagram of the surface quality of an automobile outer panel after deformation of hot-dip galvanized high-strength IF steel after improvement in the embodiment of the application;
FIG. 6b is a micrograph of a metallographic structure of an improved hot-dip galvanized high-strength IF steel automobile outer panel steel plate in the example of the present application;
FIG. 7 is a surface quality macro-topography diagram of a deformed automobile outer plate of hot-dip galvanized high-strength IF steel after improvement in an embodiment of the application;
FIG. 8 is a surface metallographic structure micrograph of a deformed high-strength IF steel automobile outer panel after improvement according to an embodiment of the present application;
FIG. 9 is a microscopic photograph of the metallographic structure of the steel plate of the improved hot-dip galvanized high-strength IF steel automobile outer plate in the example of the present application;
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings, but it should be noted that the present invention is not limited to the following embodiments.
Examples
Referring to fig. 1, a method for improving the surface quality of a hot-dip galvanized high-strength IF steel automobile outer plate comprises the following steps:
step S01: and adjusting the content of the trace elements in the high-strength IF steel chemical components, and casting the slab.
The IF steel comprises the following chemical components in percentage by mass: less than or equal to 0.01 wt% of C, less than or equal to 0.03 wt% of Si, less than or equal to 0.9 wt% of Mn, less than or equal to 0.08 wt% of P, less than or equal to 0.025 wt% of S, more than or equal to 0.01 wt% of Alt, less than or equal to 0.12 wt% of Ti, more than or equal to 0.002 wt% of N, less than or equal to 0.09 wt% of Nb, and the balance of Fe.
In the process of steel-making production, the mass percentages (wt%) of Ti and N in the chemical components of the high-strength IF steel are required to simultaneously meet the following requirements: ti is less than or equal to 0.12wt percent, and N is more than or equal to 0.002wt percent. The high-strength IF steel belongs to ultra-low carbon steel, and the amount of TiC, TiN and TiCN precipitates can be effectively increased by controlling the contents of two microalloy elements of Ti and N on the premise of not increasing the carbon content, so that the aim of fine grain strengthening is fulfilled.
For example: controlling the Ti content to be 0.042-0.051 wt%, and controlling the N content to be 0.0021-0.0031 wt%.
Step S02: and (4) heating the high-strength IF steel slab.
Step S03: carrying out rough rolling and finish rolling on the heated high-strength IF steel plate blank to obtain a finish-rolled high-strength IF steel plate;
and during finish rolling, controlling the finish rolling temperature to be 920-950 ℃. The control direction of the finishing temperature is preferably biased to a low-temperature region, and the closer to 920 ℃, the better. The fluctuation range of the finish rolling temperature is reduced by reducing the finish rolling temperature of the hot rolling finish rolling, and the grain size of the microstructure of the hot rolled plate is favorably refined.
For example: the finish rolling temperature may be set at 920 ℃, or 930 ℃, or 940 ℃, or 950 ℃.
Step S04: coiling the finish-rolled high-strength IF steel plate to obtain a high-strength IF steel hot coil;
The crimping temperature is controlled to be 700-740 ℃, and the closer to 700 ℃, the better. By reducing the curling temperature and reducing the fluctuation range of the curling temperature, the growth of recrystallized grains after hot rolling is favorably inhibited, the tissue uniformity of the whole coil in the length direction is stabilized, and the stable mechanical property of the whole coil is ensured.
For example: the crimping temperature may be controlled at 700 ℃, or 710 ℃, or 720 ℃, or 730 ℃, or 740 ℃.
Step S05: and (4) performing cold rolling on the high-strength IF steel hot coil to obtain a cold-rolled high-strength IF steel coil.
Step S06: and (3) carrying out continuous annealing treatment on the cold-rolled high-strength IF steel coil, wherein the annealing temperature is controlled to be 800-830 ℃. And the higher return temperature is adopted, so that the recrystallization completion of the cold-rolled steel plate can be ensured. However, an excessively wide annealing temperature range causes abnormal growth of grains after recrystallization of the cold-rolled steel sheet. In the embodiment, the control range of the annealing temperature is narrowed, so that the growth of recrystallized grains of the cold-rolled steel sheet can be effectively controlled, and the purpose of refining the grains is achieved.
For example: the continuous annealing temperature of the cold-rolled high-strength IF steel coil can be set to 800 ℃, or 810 ℃, or 820 ℃ or 830 ℃.
Step S07: and hot galvanizing the high-strength IF steel coil subjected to continuous annealing to obtain the hot galvanized high-strength IF steel coil.
The invention has the advantages that: the problem of orange peel generated on the macroscopic surface of the hot-dip galvanized high-strength IF steel plate after stamping deformation due to coarse or uneven crystal grains in the microstructure is solved, and the surface quality of the hot-dip galvanized high-strength IF steel plate used as an automobile outer plate material is improved. The method is simple and has obvious cost benefit, and the effect of improving the surface quality of the hot-galvanized high-strength IF steel automobile outer plate can be realized by utilizing the method without equipment transformation under the existing equipment condition.
Specifically, the method comprises the following steps:
1. the method can be used for determining the influence of the grain size in the microstructure on the orange peel problem on the surface of the hot-galvanized high-strength IF steel automobile outer plate.
The material with the orange peel problem in the macro-morphology after deformation can easily detect the orange peel defect on the surface by naked eyes and hand feeling, as shown in fig. 2; sampling the position where the orange peel defect appears after deformation, and analyzing and detecting the microstructure of the longitudinal section of the orange peel defect, and finding that the grain size in the microstructure of the longitudinal section of the orange peel defect position is not uniform and the orange peel defect position has an obvious mixed crystal phenomenon, as shown in figure 3; and (3) carrying out microscopic structure analysis and detection on the longitudinal section of the undeformed plate at the position close to the orange peel defect after deformation. It can be observed that even though the original plate material is not deformed, the sizes of the crystal grains in the microstructure of the original plate material are different, and an obvious mixed crystal phenomenon also exists, as shown in fig. 4.
2. In the process of steel-making and continuous casting, the contents of trace elements Ti and N influence the microstructure.
Ti is an important additive component of high-strength IF steel as a microalloying element. The Ti and Nb treatment of the high-strength IF steel can remove interstitial atoms C and N in solid solution to obtain a pure ferrite matrix, thereby eliminating the adverse effect of the interstitial atoms. In reality, the price of the Nb alloy is much higher than that of the Ti alloy, and the Nb element addition control in the steel making process of the steel grade is very strict in a general steel mill based on the consideration of the components. On the premise of saving the cost, the embodiment increases the input amount of Ti element in the high-strength IF steel making process. In the ultra-low carbon high-strength IF steel, when the content of Ti in chemical components is lower than 0.02 wt%, the amount of formed TiC and TiCN is less, and the clearance atoms in the solid solution cannot be eliminated sufficiently; when the content of Ti in the chemical composition is more than 0.06 wt%, Ti precipitates may be converted into FeTiP, which adversely affects the r-value of the finished steel sheet. Therefore, in this embodiment, the Ti content is controlled within a range of 0.042 to 0.051 wt%, which not only ensures complete clearance of interstitial atoms, but also does not form other precipitates to affect the final performance.
The N element is used as a trace element in the steel, and the function of the N element is basically consistent with that of the C element. In this example, the content of C element in the ultra-low carbon high strength IF steel is very low, and is substantially in the range of 0.002 wt% to 0.003 wt%. The addition of N element in proper amount can ensure the generation of a large amount of TiN, and the effects of pinning grain boundary and hindering grain growth are achieved. However, excessive addition of N will increase the amount of inclusions and adversely affect the purity of molten steel. Therefore, in this embodiment, the content of N element is controlled to be 0.0021 wt% to 0.0031 wt%.
3. The influence of the hot rolling finish rolling temperature on the grain size of the hot galvanizing high-strength IF steel.
The hot rolled coils for cold rolling are usually rolled in the austenite phase region, the finish rolling temperature being Ar3Above, the rule of the influence of the finish rolling temperature on the grain size of the hot rolled coil is as follows: the lower the finish rolling temperature, the higher the grade of the crystal grains after hot rolling, and the smaller the crystal grain size. The higher the finishing temperature is, the reverse is true. However, the minimum finishing temperature is not lower than Ar3At a temperature that would otherwise enter a two-phase region, resulting in texture, affecting the performance of the finished steel sheet in one direction. In order to control the grain size in the hot rolled coil, the finishing temperature is controlled to be 920-950 ℃, and the grain size of the hot rolled coil is controlled and the uniformity of the grain size is kept by reducing the fluctuation range of the finishing temperature.
4. Influence of hot rolling finish rolling coiling temperature on the grain size of hot galvanizing high-strength IF steel.
With the increase of the coiling temperature, the precipitation and coarsening of TiC, TiN and TiCN in austenite are facilitated, and the precipitation particularly occurs at a lower finishing rolling temperature. More carbonitride is precipitated, so that the second phase particles can play a role in pinning the grain boundary, and the grain size is further controlled. However, the coiling temperature is too high, so that the defects are also caused, and obviously, the fluctuation of the properties of the head coil, the middle coil and the tail coil caused by the uneven cooling speed in the cooling process of the hot rolled coil is large. Therefore, the coiling temperature range of hot rolling and finish rolling is controlled to be 700-740 ℃, the temperature range fluctuation in the coiling process is reduced, and the stable performance of the whole coil in the length direction is ensured while fine grains are ensured to be obtained.
5. The influence of continuous annealing temperature on the grain size of hot-dip galvanized high-strength IF steel.
The annealing process is the last process for determining the performance and grain size of the hot-dip galvanized high-strength IF steel. In the annealing process of hot-dip galvanized high-strength IF steel, the processes of ferrite recovery recrystallization, two-phase particle precipitation and the like are required to be completed. The higher annealing temperature can ensure that the recovery recrystallization of the ferrite is fully completed, and more two-phase particles are separated out, thereby forming fine grain size. However, as the annealing temperature increases, the grain size decreases and the crystal grains grow abnormally, thereby forming mixed crystals. Therefore, the return temperature of the cold-rolled high-strength IF steel coil is controlled to be 800-830 ℃, the temperature range fluctuation in the annealing process is reduced, and the problem of mixed crystals is solved.
After the series of researches on the hot rolling finish rolling temperature, the coiling temperature and the continuous annealing temperature after cold rolling of the hot-dip galvanized high-strength IF steel, the macro-morphology of the surface before and after the final product of the hot-dip galvanized high-strength IF steel plate produced by different processes is deformed and the size of the microstructure crystal grains is researched, and the hot-dip galvanized high-strength IF steel plate is detailed in the following table:
wherein:
the No. 1 coil corresponds to a macro topography picture of an orange peel defect position, an orange peel defect metallographic structure microscopic picture and an undeformed steel plate metallographic structure microscopic picture of a deformed hot-galvanized high-strength IF steel automobile outer plate, which are shown in figures 2, 3 and 4;
the deformed surface macro topography of the hot-galvanized high-strength IF steel automobile outer plate corresponding to the No. 2 coil and the metallographic structure microscopic picture of the undeformed steel plate are shown in FIGS. 5a and 5 b;
the deformed surface macro topography of the hot-galvanized high-strength IF steel automobile outer plate corresponding to the No. 3 coil and the metallographic structure microscopic picture of the undeformed steel plate are shown in FIGS. 6a and 6 b;
and (3) performing surface macro topography, metallographic structure micrographs and non-deformed steel plate metallographic structure micrographs on the deformed hot-galvanized high-strength IF steel automobile outer plate corresponding to the No. 4 coil, as shown in figures 7, 8 and 9.
Claims (3)
1. The method for improving the surface quality of the hot-dip galvanized high-strength IF steel automobile outer plate is characterized in that the IF steel comprises the following chemical components in percentage by mass: less than or equal to 0.01 wt% of C, less than or equal to 0.03 wt% of Si, less than or equal to 0.9 wt% of Mn, less than or equal to 0.08 wt% of P, less than or equal to 0.025 wt% of S, more than or equal to 0.01 wt% of Alt, less than or equal to 0.12 wt% of Ti, more than or equal to 0.002 wt% of N, less than or equal to 0.09 wt% of Nb, and the balance of Fe.
2. The method for improving the surface quality of the hot-galvanized high-strength IF steel automobile outer plate according to claim 1, wherein the IF steel comprises the following chemical components in percentage by mass: less than or equal to 0.007 wt% of C, less than or equal to 0.03 wt% of Si, less than or equal to 0.9 wt% of Mn, less than or equal to 0.08 wt% of P, less than or equal to 0.025 wt% of S, more than or equal to 0.01 wt% of Alt, 0.042-0.051 wt% of Ti, 0.0021wt-0.0031 wt% of N, and the balance of Fe and inevitable impurities.
3. The method for improving the surface quality of the hot-dip galvanized high-strength IF steel automobile outer plate according to claim 1 or 2, which is characterized by comprising the following steps of:
1) when the high-strength IF steel plate blank after rough rolling and heating is subjected to finish rolling, controlling the finish rolling temperature to be 920-950 ℃;
2) when the finish rolling high-strength IF steel plate is curled, controlling the curling temperature to be 700-740 ℃;
3) and (3) uncoiling the high-strength IF steel hot coil for cold rolling to obtain a cold-rolled high-strength IF steel coil, wherein the annealing temperature of the cold-rolled high-strength IF steel coil is controlled to be 800-830 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113699342A (en) * | 2021-08-11 | 2021-11-26 | 山东钢铁集团日照有限公司 | Control method for invisible orange peel defect of deep-drawing steel plate |
| CN113699342B (en) * | 2021-08-11 | 2023-03-14 | 山东钢铁集团日照有限公司 | Control method for invisible orange peel defect of deep-drawing steel plate |
| CN113817962A (en) * | 2021-08-26 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | Galvanized high-strength IF steel strip for connecting plate of edge beam of automobile wheel cover and preparation method thereof |
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