CN111334709B - Cold-rolled double-light plate and manufacturing method and application thereof - Google Patents
Cold-rolled double-light plate and manufacturing method and application thereof Download PDFInfo
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- CN111334709B CN111334709B CN202010150502.8A CN202010150502A CN111334709B CN 111334709 B CN111334709 B CN 111334709B CN 202010150502 A CN202010150502 A CN 202010150502A CN 111334709 B CN111334709 B CN 111334709B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0242—Flattening; Dressing; Flexing
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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
- C22C38/04—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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/228—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length skin pass rolling or temper rolling
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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- Physics & Mathematics (AREA)
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- Crystallography & Structural Chemistry (AREA)
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The application belongs to the technical field of ferrous metallurgy, and particularly relates to a method for manufacturing a cold-rolled double-light plate, which is characterized by comprising the following steps of: the plate blank is sequentially subjected to hot continuous rolling, acid pickling and cold continuous rolling, cover annealing, flattening and finishing processes to obtain a cold-rolled double-light plate; wherein the relative reduction rate in the pickling and cold continuous rolling process is controlled to be more than 50%, the roughness of a last frame working roll in the pickling and cold continuous rolling process is controlled to be 1.5-2.0 mu m, so that the roughness of a cold hard roll obtained after a plate blank is sequentially subjected to the hot continuous rolling process and the pickling and cold continuous rolling is controlled to be 0.3-0.6 mu m; and controlling the roughness of the working roll of the temper mill in the flattening procedure to be 0.02-0.06 mu m so as to realize the roughness of the cold-rolled double-light plate to be 0.15-0.30 mu m. The aim of producing the high-quality cold-rolled double-light plate with the roughness of 0.15-0.30 mu m is achieved through the copying and transferring of the roughness of the working roll.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to a cold-rolled double-light plate and a manufacturing method and application thereof.
Background
The cold-rolled double-optical plate has higher requirements on surface roughness, generally requires the surface to be bright and has small roughness; if the incoming material for producing the cold-rolled double-light plate has higher surface roughness, the roughness of the product can not meet the requirement; the surface of the existing incoming material is generally smooth, but the quality problems such as slipping and the like are easily caused during the production of the continuous annealing furnace, so that the surface quality of the cold-rolled double-light plate cannot achieve the production effect on the contrary.
Therefore, it is necessary to develop a method for manufacturing a cold-rolled dual optical plate, which satisfies the requirements of low roughness of the cold-rolled dual optical plate and ensures high quality.
Disclosure of Invention
The invention aims to provide a cold rolling double-light plate and a manufacturing method and application thereof, and aims to solve the problem that the cold rolling double-light plate in the prior art cannot meet the requirements of low roughness and high quality at the same time.
In order to achieve the above object, according to an aspect of the present invention, there is provided a method for manufacturing a cold-rolled dual optical sheet, including the steps of: the plate blank is sequentially subjected to hot continuous rolling, acid pickling and cold continuous rolling, cover annealing, flattening and finishing processes to obtain a cold-rolled double-light plate;
wherein the relative reduction rate in the pickling and cold continuous rolling process is controlled to be more than 50%, the roughness of a last frame working roll in the pickling and cold continuous rolling process is controlled to be 1.5-2.0 mu m, so that the roughness of a cold hard roll obtained after a plate blank is sequentially subjected to the hot continuous rolling process and the pickling and cold continuous rolling is controlled to be 0.3-0.6 mu m;
and controlling the roughness of the working roll of the temper mill in the flattening procedure to be 0.02-0.06 mu m so as to realize the roughness of the cold-rolled double-light plate to be 0.15-0.30 mu m.
Preferably, the step of the leveling process includes: and controlling the leveling elongation rate in the leveling procedure to be 2.5% -2.8%.
Preferably, the step of the hood annealing process includes:
according to the recrystallization temperature of the cold hard coil, adjusting the annealing temperature to 650-670 ℃;
controlling the heating rate to be less than or equal to 60 ℃/h, the heat preservation time to be 7-9 h, the cooling rate to be less than or equal to 50 ℃/h, cooling to 400 ℃, and the tapping temperature to be less than 100 ℃.
Preferably, the cold-rolled double optical plate comprises the following chemical compositions in percentage by weight: c is between 0.16 and 0.21Wt percent; si is more than or equal to 0.08 Wt% and less than or equal to 0.15 Wt%; mn is more than or equal to 0.45 Wt% and less than or equal to 0.55 Wt%; p is more than 0 and less than or equal to 0.035 Wt%; s is more than 0 and less than or equal to 0.010 Wt%; als is more than or equal to 0.035 Wt% and less than or equal to 0.012 Wt%; the balance of iron and trace elements.
Preferably, the cold-rolled double optical plate comprises the following chemical compositions in percentage by weight: c is between 0.16 and 0.21Wt percent; si is more than or equal to 0.08 Wt% and less than or equal to 0.15 Wt%; mn is more than or equal to 0.45 Wt% and less than or equal to 0.55 Wt%; p is more than 0 and less than or equal to 0.035 Wt%; s is more than 0 and less than or equal to 0.010 Wt%; als is more than or equal to 0.035 Wt% and less than or equal to 0.012 Wt%; the balance of iron and trace elements.
Preferably, the cold-rolled double optical plate comprises the following chemical compositions in percentage by weight: c: 0.185 Wt%; si: 0.096 Wt%; mn: 0.501 Wt%; p: 0.033 Wt%; s: 0.0052 Wt%; and Als: 0.016 Wt%; the balance of iron and inevitable trace elements.
Preferably, the step of the hot continuous rolling process includes: controlling the tapping temperature to be more than or equal to 1080 ℃; the finishing temperature is controlled to be 880 +/-20 ℃, and the coiling temperature is 640 +/-20 ℃.
On the other hand, the embodiment of the invention provides a cold-rolled double-light plate, which is manufactured by the manufacturing method of the cold-rolled double-light plate.
Preferably, the yield strength of the cold-rolled double-light plate is more than or equal to 300MPa, the tensile strength is more than or equal to 430MPa, and the elongation is more than or equal to 30%.
In another aspect, the embodiment of the invention provides an application of the cold-rolled dual-light plate in a guide rail, an automobile part, an LED lamp and tableware.
Compared with the prior art, the invention has the following beneficial effects:
the invention controls the roughness of the working roll of the frame at the end of the pickling cold continuous rolling process and the working roll in the leveling process by adopting the cover annealing process, and not only meets the low roughness of the cold-rolled double-optical plate, but also reduces the incidence rate of bonding defects and the like in the cover annealing process and improves the surface quality of the cold-rolled double-optical plate by copying and transferring the roughness of the working roll, thereby realizing the purpose of producing the high-quality cold-rolled double-optical plate with the roughness of 0.15-0.30 mu m.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In one aspect, an embodiment of the present invention provides a method for manufacturing a cold-rolled dual optical sheet.
The cold-rolled double-smooth plate is obtained by a plate blank obtained by blast furnace molten iron smelting, converter molten steel smelting, LF molten steel refining, plate blank continuous casting and soaking processes, and the plate blank is subjected to hot continuous rolling, acid pickling and cold continuous rolling, cover annealing, flattening and finishing processes in sequence.
Wherein, the carbon content of the argon station can be controlled between 0.1 and 0.16 percent in the smelting process of the converter molten steel. The LF molten steel refining process comprises the steps of finishing molten steel in an LF furnace, adjusting components, sampling in a station, and adjusting the contents of Si and Mn according to a detection result; and (4) switching on bottom blowing after the molten steel enters the station so as to melt slag. The slab continuous casting process comprises the steps of requiring to put in ladle slag discharge detection control, controlling the temperature of a continuous casting tundish to 1510-1560 ℃, using medium-carbon steel casting slag in the tundish, controlling the casting blank casting speed to be more than or equal to 3.6m/min, controlling the rephosphorization content to be more than or equal to 0.005%, and not making cold rolling double-light plates on slabs corresponding to abnormal processes such as rush connection, drainage of molten steel, rising and falling of a stopper rod to exceed 5mm and the like.
Wherein the plate blank is sequentially subjected to the hot continuous rolling procedure and the acid pickling cold continuous rolling to obtain a cold hard coil; the main purpose of hot continuous rolling is to roll thicker slabs into relatively thinner hot rolled coils; the main purpose of pickling cold continuous rolling is to remove the iron scale on the surface of the steel plate and roll a thicker hot rolled plate coil into a thinner cold hard coil.
The roughness of the chilled coil is influenced by the upstream frame rolling and the last frame rolling in the pickling cold continuous rolling, the relative reduction rate in the pickling cold continuous rolling process is more than 50%, the characteristics of the surface of the pickling cold continuous rolling working roll are printed into the surface of the chilled coil, namely the roughness of the chilled coil is mainly influenced by the roughness of the last frame working roll, the roughness of the last frame working roll in the pickling cold continuous rolling process is controlled to be 1.5-2.0 mu m, and the roughness of the chilled coil can be 0.3-0.6 mu m. After the plate blank is sequentially subjected to the hot continuous rolling procedure and the acid pickling and cold continuous rolling, the surface roughness of the off-line strip steel can be controlled to be 0.3-0.6 mu m. Preferably, the roughness of the last frame work roll in the pickling cold continuous rolling process is 1.5 μm, 1.6 μm, 1.8 μm or 2.0. mu.m. Preferably, the relative reduction in the pickling cold continuous rolling step is 50% to 65%, such as 50%, 52%, 55%, 58%, 60%, 61%, 62% or 65%.
Controlling the roughness of the last frame working roll in the pickling cold continuous rolling procedure to be 1.5-2.0 microns, facilitating the next cover type annealing procedure and preventing the roughness of the cold hard roll from being too high or too low; specifically, the method prevents the cold hard coil from having too low roughness and generating a bonding phenomenon in the cover type annealing process, and prevents the steel coil lifted by a vertical clamp of the cover type furnace from generating core pulling and generating safety accidents; meanwhile, the roughness of the cold hard coil is prevented from being too high, and the roughness of the obtained cold-rolled double-optical-plate finished product is too high to meet the requirements of customers.
In addition, the main function of the flattening process is to eliminate the yield plateau, because the steel plate with the yield plateau has tensile strain mark defects when being deformed. The roughness of the steel plate in the leveling procedure can be copied and transferred by the roughness of the working roll of the leveling machine, the roughness of the working roll of the leveling machine in the leveling procedure is controlled to be 0.02-0.06 mu m, compared with the roughness of the working roll of the leveling machine in the prior art, such as 3.5 mu m, the large span of magnitude order is realized, the low-roughness working roll is beneficial to cold rolling of a double-light plate to obtain a low-roughness surface, and the surface roughness of the off-line strip steel after the leveling procedure can be controlled to be 0.15-0.3 mu m; the roughness of the cold rolling double-light plate of the final finished product can be 0.15-0.30 μm; the roughness of the cold-rolled double-light plate can be 0.15 μm, 0.2 μm, 0.25 μm or 0.3 μm; the finished product produced by the method has wider specification.
According to the embodiment of the invention, a continuous annealing unit production process is not adopted, but a cover annealing process is adopted, so that a double optical plate product with a wider specification can be produced, and the cover annealing production process is adopted, so that the slipping phenomenon cannot occur. The roughness of a rack working roll and a working roll in a leveling procedure at the end of an acid pickling cold continuous rolling procedure is controlled, and the roughness of the working roll is copied and transferred, so that the low roughness of the cold-rolled double-optical plate is met, the incidence rate of bonding defects and the like in a cover annealing procedure can be reduced, and the surface quality of the cold-rolled double-optical plate is improved; the purpose of producing the high-quality cold-rolled double-light plate with the roughness of 0.15-0.30 mu m can be realized.
In order to further reduce the roughness of the cold-rolled double-light plate product, the roughness of the cold-rolled double-light plate product can be further reduced by controlling the flattening elongation in the flattening process to be 2.5% -2.8%, the replication rate of the roughness of the working roll in the flattening process can be improved by a larger flattening elongation, and the replication rate of the roughness can be improved from 40% -45% to 60% -65%. Preferably, the flat elongation may be 2.5%, 2.6%, 2.7% or 2.8%.
On the other hand, when the flattening elongation in the flattening process is controlled to be 2.5-2.8%, the mechanical property of the cold-rolled double-light plate of the final product can be improved, such as the yield strength of the cold-rolled double-light plate.
In order to further improve the mechanical property of the final product cold-rolled double-light plate, the hood type annealing process can be adjusted, and the main purpose of the hood type annealing is to eliminate the work hardening generated in the pickling cold continuous rolling process and fully recrystallize the steel plate. The most critical parameters are annealing temperature and holding time, and the tapping temperature is mainly used for avoiding the oxidation of a high-temperature tapping steel plate. The step of the hood-type annealing process comprises the following steps: determining the recrystallization temperature of the chilled coil through a muffle furnace experiment, and adjusting the annealing temperature to be 650-670 ℃ according to the recrystallization temperature of the chilled coil; controlling the heating rate to be less than or equal to 60 ℃/h, the heat preservation time to be 7-9 h, the cooling rate to be less than or equal to 50 ℃/h, cooling to 400 ℃, and the tapping temperature to be less than 100 ℃; at the moment, the annealing temperature is higher than the recrystallization temperature by about 60 ℃, the annealing temperature is lower, and relatively less heat preservation time is adopted, so that the mechanical property of the cold-hard coil is improved on the premise that the cold-hard coil is completely recrystallized in the cover type annealing process; in addition, the lower annealing temperature can improve the bonding resistance of interface atoms between the cold-hard coil layers, the phenomenon of welding is not easy to occur in the annealing process, and the occurrence rate of bonding defects in the cover type annealing process can be reduced on the premise of ensuring the roughness of the cold-rolled double-optical plate.
On the premise of not adding additional alloy components, the chemical composition and the weight percentage of the cold rolling double-light plate are controlled as follows: c is between 0.16 and 0.21Wt percent; si is more than or equal to 0.08 Wt% and less than or equal to 0.15 Wt%; mn is more than or equal to 0.45 Wt% and less than or equal to 0.55 Wt%; p is more than 0 and less than or equal to 0.035 Wt%; s is more than 0 and less than or equal to 0.010 Wt%; als is more than or equal to 0.035 Wt% and less than or equal to 0.012 Wt%; the balance of iron and trace elements. And controlling the leveling elongation rate to be 2.5-2.8% in the leveling procedure, and adjusting the parameters of the cover annealing procedure such as the annealing temperature to be 650-670 ℃; controlling the heating rate to be less than or equal to 60 ℃/h, the heat preservation time to be 7-9 h, the cooling rate to be less than or equal to 50 ℃/h, cooling to 400 ℃, and the tapping temperature to be less than 100 ℃; the strength of the cold-rolled double-light plate can be improved, for example, the yield strength is more than or equal to 300MPa, the tensile strength is more than or equal to 430MPa, and the elongation is more than or equal to 30%.
In order to further optimize the embodiment of the present invention, the steps of the hot continuous rolling process include: controlling the tapping temperature to be more than or equal to 1080 ℃; the finishing temperature is controlled to be 880 +/-20 ℃, and the coiling temperature is 640 +/-20 ℃. The tapping temperature is firstly determined by the temperature drop from the heating furnace to the finish rolling temperature, and is mainly determined by the advantages and disadvantages of the tapping temperature on the material performance; the setting of the finish rolling temperature is ensured to be not lower than the austenite transformation temperature.
Preferably, the thickness deviation of the double-light plate due to cold rolling is generally-0.030 mm-0 mm, and the thickness is generally measured at 15mm from the edge of the steel strip. The negative string rollers can be put into the pickling and cold continuous rolling process, so that the same plate difference is controlled, the thickness difference between the edge part and the middle part in the width direction is as small as possible, and the same plate difference can be controlled to be 0.015-0.02 mm.
Wherein the finishing process may further comprise a rewinding processSpecifically, common antirust oil is coated, and the coating amount is 300-500 mg/m2And (5) controlling.
According to the embodiment of the invention, a balance point is found among stable and smooth production, product quality and customer requirements such as low roughness by establishing proper chemical components, a hot continuous rolling process, an acid pickling cold continuous rolling process and a finishing process, so that the cold rolling double-light plate with low roughness, high surface quality and high strength is stably produced.
In another aspect, the embodiment of the invention provides a cold-rolled double-light plate, which is prepared by the manufacturing method. The roughness of the cold-rolled double-light plate provided by the embodiment of the invention is less than 0.30 mu m.
In another aspect, the embodiment of the invention provides an application of the cold-rolled dual-light plate in a guide rail, an automobile part, an LED lamp and tableware.
The cold-rolled double-light plate has low roughness, and can be applied to products such as guide rails, automobile parts, LED lamps, tableware and the like through processes such as splitting, roll forming, acid washing, electroplating and the like; but are not limited to the above products.
The present invention will be further described with reference to the following specific examples.
The code corresponding relation of the finished cold rolling double-light plate in each process is as follows:
taking the smelting furnace number of 9100270 as an example,
a cold rolling double-light plate comprises the following chemical components in percentage by weight: c: 0.185 Wt%; si: 0.096 Wt%; mn: 0.501 Wt%; p: 0.033 Wt%; s: 0.0052 Wt%; and Als: 0.016 Wt%; the balance of iron and inevitable trace elements.
The manufacturing method comprises the following steps: and sequentially carrying out blast furnace molten iron smelting, converter molten steel smelting, LF molten steel refining, slab continuous casting, soaking, hot continuous rolling, acid pickling cold continuous rolling, cover annealing, leveling and finishing processes to obtain the cold-rolled double-smooth plate.
The specific process parameters are as follows:
the converter molten steel smelting process comprises the following steps: the C content of the steel is controlled to be 0.049%, and the carbon content of an argon station is controlled to be 0.1367%;
the LF molten steel refining process comprises the following steps: the refining time was 54 min.
The slab continuous casting process comprises the following steps: the tundish temperature is 1551 ℃, and the pulling speed is 3.8 m/min.
The hot continuous rolling process comprises the following steps:
| steel coil number | Tapping temperature (. degree.C.) | Finish Rolling temperature (. degree.C.) | Coiling temperature (. degree.C.) |
| 9020032100 | 1112 | 884 | 641 |
| 9020032200 | 1104 | 883 | 643 |
| 9020032300 | 1103 | 884 | 642 |
| 9020032400 | 1146 | 884 | 644 |
| 90200324A0 | 1141 | 886 | 640 |
The pickling cold continuous rolling process comprises the following steps:
| cold and hard scroll number | Reduction ratio (%) | Roughness of cold and hard roll (um) |
| A994203500 | 53.08 | 0.54 |
| A994205800 | 61.88 | 0.44 |
| A994205900 | 61.88 | 0.44 |
| A994208600 | 63.57 | 0.46 |
| A994208700 | 63.57 | 0.46 |
The cover annealing process comprises the following steps:
the leveling process comprises the following steps:
| number of temper mill | Flat elongation |
| D944169110 | 2.5％ |
| D944170000 | 2.6％ |
| D944171010 | 2.7％ |
| D944170110 | 2.7％ |
| D944175900 | 2.8％ |
The performance parameters of the finished cold-rolled double-light plate are as follows:
| finished product roll number | Yield strength (MPa) | Tensile strength (MPa) | Elongation (%) |
| E924161310 | 329 | 447 | 32.5 |
| E924161320 | 320 | 443 | 33 |
| E924161330 | 326 | 438 | 34 |
| E924164210 | 348 | 468 | 31 |
| E924164220 | 351 | 473 | 32 |
| E924164230 | 342 | 465 | 32 |
| E924168410 | 310 | 441 | 33 |
| E924168420 | 316 | 452 | 35 |
| E924168430 | 328 | 461 | 32 |
| E924168610 | 347 | 486 | 33 |
| E924168620 | 344 | 484 | 34 |
| E924168630 | 341 | 477 | 35 |
| E924177210 | 339 | 462 | 33.5 |
| E924177220 | 336 | 457 | 36.5 |
| E924177230 | 336 | 450 | 36 |
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The manufacturing method of the cold-rolled double-light plate is characterized by comprising the following steps of: the plate blank is sequentially subjected to hot continuous rolling, acid pickling cold continuous rolling, cover annealing, flattening and finishing processes to obtain a cold-rolled double-smooth plate;
wherein the relative reduction rate in the pickling and cold continuous rolling process is controlled to be more than 50%, the roughness of a last frame working roll in the pickling and cold continuous rolling process is controlled to be 1.5-2.0 mu m, so that the roughness of a cold hard roll obtained after a plate blank is sequentially subjected to the hot continuous rolling process and the pickling and cold continuous rolling is controlled to be 0.3-0.6 mu m;
controlling the roughness of a working roll of the temper mill in the leveling procedure to be 0.02-0.06 mu m so as to realize the roughness of the cold-rolled double-light plate to be 0.15-0.30 mu m; the step of the leveling process comprises: controlling the leveling elongation rate in the leveling procedure to be 2.5% -2.8%;
the cold-rolled double-light plate comprises the following chemical components in percentage by weight: c is between 0.16 and 0.21 percent by weight; si is more than or equal to 0.08 wt% and less than or equal to 0.15 wt%; mn is more than or equal to 0.45 weight percent and less than or equal to 0.55 weight percent; p is more than 0 and less than or equal to 0.035wt percent; s is more than 0 and less than or equal to 0.010 wt%; als is more than or equal to 0.012 wt% and less than or equal to 0.035 wt%; the balance of iron and trace elements.
2. The method for manufacturing a cold-rolled twinned light panel as claimed in claim 1, wherein the step of the cap annealing process includes:
according to the recrystallization temperature of the cold hard coil, adjusting the annealing temperature to 650-670 ℃;
controlling the heating rate to be less than or equal to 60 ℃/h, the heat preservation time to be 7-9 h, the cooling rate to be less than or equal to 50 ℃/h, cooling to 400 ℃, and the tapping temperature to be less than 100 ℃.
3. The manufacturing method of the cold-rolled double-light plate as claimed in claim 1, wherein the cold-rolled double-light plate comprises the following chemical compositions in percentage by weight: c: 0.185 wt%; si: 0.096 wt%; mn: 0.501 wt%; p: 0.033 wt%; s: 0.0052 wt%; and Als: 0.016 wt%; the balance of iron and inevitable trace elements.
4. The method for manufacturing a cold-rolled twinax plate as claimed in claim 1, wherein the step of the hot continuous rolling process comprises: controlling the tapping temperature to be more than or equal to 1080 ℃; the finishing temperature is controlled to be 880 +/-20 ℃, and the coiling temperature is 640 +/-20 ℃.
5. A cold-rolled dual optical sheet produced by the method for producing a cold-rolled dual optical sheet according to any one of claims 1 to 4.
6. The cold-rolled double-light plate according to claim 5, wherein the yield strength of the cold-rolled double-light plate is equal to or more than 300MPa, the tensile strength of the cold-rolled double-light plate is equal to or more than 430MPa, and the elongation of the cold-rolled double-light plate is equal to or more than 30%.
7. Use of the cold-rolled dual light panel according to any one of claims 5 to 6 in guide rails, automotive parts, LED lamps, tableware.
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| CN102296231B (en) * | 2010-06-25 | 2013-05-01 | 鞍钢股份有限公司 | Method for producing 0.25-0.35mm superfinishing cold-rolled sheet by continuous annealing line |
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Effective date of registration: 20210607 Address after: 417000 Shuangling building, no.1005, Gangui Road, Huangnitang, Louxing District, Loudi City, Hunan Province Patentee after: LYSTEEL Co.,Ltd. Patentee after: Hunan Hualing LIANGANG special new material Co., Ltd Address before: 417000 Shuangling building, no.1005, Gangui Road, Huangnitang, Louxing District, Loudi City, Hunan Province Patentee before: LYSTEEL Co.,Ltd. Patentee before: HUNAN HUALING LIANGANG STEEL SHEET Co.,Ltd. |