CN109022736B - Cold rolling process regulation and control method for interstitial free steel continuous annealing sheet - Google Patents
Cold rolling process regulation and control method for interstitial free steel continuous annealing sheet Download PDFInfo
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- CN109022736B CN109022736B CN201810882937.4A CN201810882937A CN109022736B CN 109022736 B CN109022736 B CN 109022736B CN 201810882937 A CN201810882937 A CN 201810882937A CN 109022736 B CN109022736 B CN 109022736B
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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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0436—Cold rolling
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Abstract
The invention provides a method for regulating and controlling a cold rolling process of a gapless atomic steel continuous annealing sheet, when the carbon content of the gapless atomic steel is in the range of 0.0005-0.0050% by mass, the total reduction of the cold rolling is set to be 68.0-77.2% for the gapless atomic steel continuous annealing sheet with the thickness of 0.8mm, the thickness of a adopted hot rolled coil is 2.5-3.5mm, and the cold rolling is finished in five passes. The invention respectively adopts different cold rolling reduction amounts aiming at the gapless atomic steel continuous annealing sheets with different carbon contents, and can ensure that the surface waviness of the gapless atomic steel continuous annealing sheets is controlled at a lower level after the gapless atomic steel continuous annealing sheets are subjected to stamping deformation with a certain deformation amount under the condition of not influencing the deep drawing performance of the gapless atomic steel continuous annealing sheets.
Description
Technical Field
The invention belongs to the technical field of metal material processing, and particularly relates to a cold rolling process regulating and controlling method of a gapless atomic steel continuous annealing sheet.
Background
The automobile outer panel is required to have uniform surface after being stamped, the phenomenon of rough surface or surface stripes is avoided, otherwise, the appearance quality of a paint film after paint spraying is possibly influenced, and the surface has orange peel defects. The interstitial free steel continuous annealing thin plate with the thickness of 0.8mm is commonly used for producing automobile outer plates, and the surface roughness phenomenon is easy to occur after stamping.
In order to avoid the painted surface orange peel defect caused by punching roughness of the interstitial free steel continuous annealing sheet, two methods are generally adopted: one is that the thickness of a paint film is increased in the coating process of an automobile factory; the other is controlling the surface quality in the continuous annealing thin plate production process of a steel mill. The two methods can not thoroughly solve the problem of surface quality after punching of the continuous annealing thin plate of interstitial-free steel and the adverse effect on coating.
The coating process of the automobile outer plate in the automobile factory generally adopts the traditional three-way two-baking process, the thickness of a paint film is thicker, and the cost is increased. More and more automobile factories begin to adopt the floating-coating-free process, so that the consumption of the coating is reduced, and the covering power of the defects on the surface of the steel plate is reduced, so that the requirement of the automobile factories on the surface quality of the punched interstitial-free steel is improved.
The control of the surface quality of the continuous annealing automobile outer plate by a steel mill mainly comprises the control of surface defects and the control of surface roughness and waviness. However, most of the surface problems after stamping of the interstitial free steel continuous annealing thin plate come from the changes of surface roughness and waviness in the stamping process, and the surface quality after stamping cannot be thoroughly improved by controlling the surface quality of the original plate.
Disclosure of Invention
In order to solve the above-mentioned defects in the prior art, the main object of the present invention is to provide a method for controlling the cold rolling process of a continuously annealed interstitial free steel sheet, which ensures that the surface waviness of the continuously annealed interstitial free steel sheet is controlled at a lower level after the continuously annealed interstitial free steel sheet is subjected to stamping deformation with a certain deformation amount without affecting the deep drawability of the continuously annealed interstitial free steel sheet.
In order to achieve the purpose, the invention adopts the following technical scheme: a cold rolling process regulation and control method of a continuous annealing sheet of interstitial free steel comprises the following steps: when the carbon content of the interstitial free steel is in the range of 0.0005-0.0050% by mass, cold rolling is performed by using a hot rolled coil with a thickness of 2.5-3.5mm, the total reduction amount of the cold rolling is set to 68.0-77.2%, and the cold rolling is completed in five passes to obtain an interstitial free steel continuous annealing sheet with a thickness of 0.8 mm.
As a further preferred example, a 5-stand continuous cold rolling mill is used for the cold rolling.
As a further optimization, in the cold rolling process, the technical parameters are controlled as follows:
(1) the interstitial free steel having a carbon content in the range of 0.0005 to 0.00249% is cold-rolled by using a hot-rolled coil of 2.5 to 2.85mm, and the total rolling reduction of the cold-rolled coil is set to 68.0 to 72.0%.
(2) For interstitial free steel with the carbon content of 0.0005-0.00249%, the single-pass reduction is less than or equal to 30%.
(3) The interstitial free steel with carbon content in the range of 0.0025-0.0050% is cold-rolled by using a hot-rolled coil of 2.85-3.5mm, and the total cold-rolled reduction is set to 71.9-77.2%.
(4) For interstitial-free steel with carbon content within the range of 0.0025-0.0050%, the single-pass reduction is less than or equal to 35%.
As a further optimization, the interstitial free steel comprises the following chemical components in percentage by mass: c, 0.0005-0.0050%; si, less than or equal to 0.03 percent; 0.05 to 0.25 percent of Mn; p is less than or equal to 0.015 percent; s, less than or equal to 0.03 percent; 0.02-0.05% of Alt; ti is more than or equal to 0.05 percent.
Preferably, the cold rolling process of the interstitial free steel continuous annealing sheet further comprises hot rolling and coiling to obtain a hot rolled coil, wherein the hot rolled slab heating temperature is 1200 ℃, and the coiling temperature is 720 ℃.
Further preferably, the interstitial free steel has a carbon content of the carbon content in the hot rolled coil.
The cold rolling process regulating method for the interstitial free steel continuous annealing sheet is used for producing the interstitial free steel continuous annealing sheet with the thickness of 0.8mm, and the surface linear waviness W is obtained after stamping deformation with the deformation amount of less than or equal to 8 percentsa1-5≤0.38μm。
The interstitial free steel continuous annealing thin plate with the thickness of 0.8mm is produced by using the cold rolling process regulating and controlling method of the interstitial free steel continuous annealing thin plate, and the transverse plastic strain ratio r value of the interstitial free steel continuous annealing thin plate is more than or equal to 1.8.
The invention has the beneficial effects that: the invention sets cold rolling reduction according to the carbon content of interstitial-free steel, when the carbon content of the interstitial-free steel is in the range of 0.0005-0.0050% by mass, the total cold rolling reduction of a 0.8mm continuous annealing sheet is set to be 68.0-77.2%, the thickness of a adopted hot rolled coil is 2.5-3.5mm, and the cold rolling is finished in five passes. The invention respectively sets different cold rolling reduction amounts aiming at interstitial free steel with different carbon contents, adopts relatively lower cold rolling reduction amount for interstitial free steel with lower carbon content, and adopts relatively higher cold rolling reduction amount for interstitial free steel with higher carbon content by considering the deep drawing performance of the interstitial free steel. The lower cold rolling reduction reduces the proportion of the shear texture of the surface layer, thereby controlling the surface waviness to be at a lower level after the stamping deformation with a certain deformation amount, and simultaneously keeping the r value within a certain range.
Detailed Description
The embodiment of the invention provides a method for regulating and controlling a cold rolling process of a gapless atomic steel continuous annealing sheet, and the quality defect of high surface waviness of the gapless atomic steel continuous annealing sheet after punching deformation with a certain deformation is overcome.
In order to solve the above-mentioned defects, the main idea of the embodiment of the present invention is:
according to the method for regulating the cold rolling process of the interstitial free steel continuous annealing sheet, when the carbon content of the interstitial free steel is in the range of 0.0005-0.0050% by mass, the total reduction of the cold rolling is set to be 68.0-77.2% for the continuous annealing sheet with the thickness of 0.8mm, the thickness of the adopted hot rolled coil is 2.5-3.5mm, and the cold rolling is finished in five passes.
At present, in order to ensure that the continuous annealing sheet has better deep drawing performance, higher cold rolling reduction is generally set for interstitial-free steel. However, in the research process, the uneven deformation of interstitial-free steel due to the high cold rolling reduction rate is found, the shear texture is generated on the surface, and the uneven shaping flow is generated during the surface stamping due to the large amount of shear texture on the surface, so that the waviness of the surface is improved after stamping, the roughness phenomenon is generated, and the appearance quality of the surface of the coated automobile outer plate is influenced. Therefore, in order to reduce the surface waviness after stamping and ensure that the continuously annealed sheet has better deep drawing performance, different cold rolling reduction amounts are respectively set for interstitial-free steel with different carbon contents, the interstitial-free steel with lower carbon content adopts the relatively lower cold rolling reduction amount, and the interstitial-free steel with higher carbon content adopts the relatively higher cold rolling reduction amount in consideration of the deep drawing performance. The lower cold rolling reduction reduces the proportion of the shear texture of the surface layer, thereby controlling the surface waviness to be at a lower level after the stamping deformation with a certain deformation amount, and simultaneously keeping the r value within a certain range.
The embodiment of the invention can ensure that the continuous annealing thin plate can obtain uniform and smooth appearance after being punched and processed without increasing the cost and influencing the deep drawing performance of the gapless atomic steel continuous annealing thin plate. The interstitial free steel continuous annealing sheet with the thickness of 0.8mm, which is produced by adopting the method provided by the embodiment of the invention, has the transverse plastic strain ratio r value of more than or equal to 1.8, and is subjected toAfter the stamping deformation with the deformation amount less than or equal to 8 percent, the surface waviness Wsa1-5≤0.38μm。
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, several embodiments accompanied with the method for controlling a cold rolling process of a interstitial free steel continuously annealed sheet according to the present invention are described below.
Examples
According to the method for regulating the cold rolling process of the interstitial free steel continuous annealing sheet, when the carbon content of the interstitial free steel is in the range of 0.0005-0.0050% by mass, the total reduction of the cold rolling is set to be 68.0-77.2% for the continuous annealing sheet with the thickness of the adopted hot rolled coil to be 2.5-3.5mm, and the cold rolling is finished in five passes.
The cold rolling adopts a 5-frame continuous cold rolling mill.
Cold rolling interstitial-free steel with C content of 0.0005-0.00249% by using hot rolled coil of 2.5-2.85mm, and setting total rolling reduction of cold rolling to 68.0-72.0%; the single-pass reduction is less than or equal to 30 percent.
Cold rolling interstitial-free steel with C content of 0.0025-0.0050% by using hot rolled coil of 2.85-3.5mm, and setting total cold rolling reduction amount to 71.9-77.2%; the single-pass reduction is less than or equal to 35 percent.
The general production process flow of the interstitial free steel continuous annealing thin plate (DC04) is as follows: molten iron pretreatment → converter → RH refining → slab pouring → billet finishing → hot rolling → coiling → uncoiling → acid pickling → cold rolling → coiling → uncoiling → welding → cleaning → annealing → leveling → oiling → coiling, etc.
The examples shown in the following table are r-values and surface waviness after press deformation of DC04 continuously annealed sheets for automobile outer panels manufactured according to the method of the present invention. The chemical cost mass percentage of the interstitial free steel DC04 is as follows: c, 0.0005-0.0050%; si, less than or equal to 0.03 percent; 0.05 to 0.25 percent of Mn; p is less than or equal to 0.015 percent; s, less than or equal to 0.03 percent; 0.02-0.05% of Alt; ti is more than or equal to 0.05 percent. Wherein the heating temperature of the hot rolled plate blank is 1200 ℃, the coiling temperature is 720 ℃, the hot rolled coils on the following table are set with cold rolling reduction according to the carbon content of each coil, and the hot rolled coil is finished in five passes. The following Table 1 showsThe obtained DC04 continuous annealing sheet with the thickness OF 0.8mm is subjected to a tensile test by adopting a P6 mechanical tensile sample in GBT 228.1-2010 metal material tensile test to obtain a transverse plastic strain ratio r value and a surface WAVINESS W value obtained after punching deformation with a certain deformation according to VO L KSWAGEN PV 1054: TESTING OF WAVINESSsa1-5。
TABLE 1
Actual production proves that the method for setting the thickness and the cold rolling reduction of the hot rolled plate provided by the embodiment of the invention is adopted for the interstitial-free steel for the automobile outer plate with the thickness of 0.8mm according to different carbon contents, and the continuous annealing thin plate is subjected to stamping processing to obtain uniform and smooth appearance under the condition of not influencing the deep drawing performance of the interstitial-free steel continuous annealing thin plate.
The continuous annealing sheet obtained in the embodiment has the transverse plastic strain ratio r value of more than or equal to 1.8, and the surface waviness W after the continuous annealing sheet is subjected to stamping deformation with the deformation of less than or equal to 8 percentsa1-5Less than or equal to 0.38 mu m, and can meet the requirements of automobile factories on automobile outer plates.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the invention sets cold rolling reduction according to the carbon content of interstitial-free steel, when the carbon content of the interstitial-free steel is in the range of 0.0005-0.0050% by mass, the total cold rolling reduction of a 0.8mm continuous annealing sheet is set to be 68.0-77.2%, the thickness of the adopted hot rolled coil is 2.5-3.5mm, and the process is finished in five passes. The invention respectively sets different cold rolling reduction amounts aiming at interstitial free steel with different carbon contents, adopts relatively lower cold rolling reduction amount for interstitial free steel with lower carbon content, and adopts relatively higher cold rolling reduction amount for interstitial free steel with higher carbon content by considering the deep drawing performance of the interstitial free steel. The lower cold rolling reduction reduces the proportion of the shear texture of the surface layer, thereby controlling the surface waviness to be at a lower level after the stamping deformation with a certain deformation amount, and simultaneously keeping the r value within a certain range.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A cold rolling process regulation and control method of a continuous annealing sheet of interstitial free steel is characterized by comprising the following steps: when the carbon content of the interstitial free steel is in the range of 0.0005-0.0050% by mass, performing cold rolling by using a hot rolled coil with the thickness of 2.5-3.5mm, wherein the total reduction amount of the cold rolling is set to be 68.0-77.2%, and completing the cold rolling in five passes to obtain an interstitial free steel continuous annealing sheet with the thickness of 0.8 mm;
the interstitial free steel comprises the following chemical components in percentage by mass: c, 0.0005-0.0050%; si, less than or equal to 0.03 percent; 0.05 to 0.25 percent of Mn; p is less than or equal to 0.015 percent; s, less than or equal to 0.03 percent; 0.02-0.05% of Alt; ti is more than or equal to 0.05 percent;
in the cold rolling process, the method comprises the following steps:
(1) cold rolling interstitial free steel with carbon content of 0.0005-0.00249% by using hot rolled coil with thickness of 2.5-2.85mm, and setting total rolling reduction of cold rolling to 68.0-72.0%;
(2) for interstitial free steel with the carbon content of 0.0005-0.00249%, the single-pass reduction is less than or equal to 30%;
(3) cold rolling interstitial-free steel with carbon content of 0.0025-0.0050% by using hot rolled coil with thickness of 2.85-3.5mm, and setting total cold rolling reduction at 71.9-77.2%;
(4) for interstitial-free steel with carbon content within the range of 0.0025-0.0050%, the single-pass reduction is less than or equal to 35%.
2. The method for regulating and controlling the cold rolling process of the interstitial free steel continuous annealed sheet according to claim 1, which is characterized in that: the cold rolling adopts a 5-frame continuous cold rolling mill.
3. The method for regulating and controlling the cold rolling process of the interstitial free steel continuous annealed sheet according to claim 1, which is characterized in that: the cold rolling process of the interstitial free steel continuous annealing sheet further comprises hot rolling and coiling to obtain a hot rolled coil, wherein the heating temperature of a hot rolled plate blank is 1200 ℃, and the coiling temperature is 720 ℃.
4. The method for regulating and controlling the cold rolling process of the interstitial free steel continuous annealed sheet according to claim 1, which is characterized in that: the carbon content of the interstitial free steel is the carbon content of the hot rolled coil.
5. The method for regulating and controlling the cold rolling process of the interstitial free steel continuous annealed sheet according to claim 1, which is characterized in that: the obtained continuous annealing thin plate of interstitial free steel with the thickness of 0.8mm has surface waviness W after stamping deformation with the deformation amount less than or equal to 8 percentsa1-5≤0.38μm。
6. The method for regulating and controlling the cold rolling process of the interstitial free steel continuous annealed sheet according to claim 1, which is characterized in that: the transverse plastic strain ratio r value of the obtained gapless atomic steel continuous annealing sheet with the thickness of 0.8mm is more than or equal to 1.8.
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| CN109881115A (en) * | 2019-03-19 | 2019-06-14 | 首钢集团有限公司 | A kind of Ti microalloying gapless atomic steel and its manufacturing method |
| CN110146034A (en) * | 2019-06-20 | 2019-08-20 | 本钢板材股份有限公司 | A kind of method of discrimination of the cold-reduced sheet surface quality based on surface waviness |
| CN112048671B (en) * | 2020-09-07 | 2021-10-01 | 北京首钢股份有限公司 | Continuous annealing cold-rolled carbon steel for stamping and preparation method thereof |
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