CN111575465A - Production method for preventing surface of hot-rolled pickled steel from blackening - Google Patents
Production method for preventing surface of hot-rolled pickled steel from blackening Download PDFInfo
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- CN111575465A CN111575465A CN202010404163.1A CN202010404163A CN111575465A CN 111575465 A CN111575465 A CN 111575465A CN 202010404163 A CN202010404163 A CN 202010404163A CN 111575465 A CN111575465 A CN 111575465A
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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
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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Abstract
The invention discloses a production method for preventing the surface of hot-rolled pickled steel from blackening, which comprises the following process control: smelting; heating the plate blank: the total in-furnace time of the plate blank is 170-220 min, and the furnace temperature of the heating furnace is controlled to be 1280-1350 ℃; hot rolling and rough rolling: controlling the finishing rolling temperature to be 1050-1110 ℃; hot rolling and finish rolling: the first frame to the fourth frame all adopt high-speed steel rolls; laminar cooling; coiling: the steel coil is coiled at the temperature of 620-680 ℃ after being cooled by laminar flow; acid washing: pickling the steel coil by a continuous pickling tank, wherein the pickling temperature is 70-85 ℃, the HCl concentration in the pickling tank is 80-200 g/L, and the speed of the steel belt is controlled within the range of 120-180 m/min during pickling; and (5) drying. The invention avoids the surface blackening defect through reasonable process control on the basis of properly improving the high-temperature oxidation resistance of the hot-rolled pickled steel.
Description
Technical Field
The invention relates to a steel rolling production control technical method, in particular to a production method for preventing blackening of the surface of hot-rolled pickled steel, and belongs to the technical field of steel rolling production.
Background
The hot-rolled pickled steel is an intermediate product between a hot-rolled plate and a cold-rolled plate, the quality requirement of the hot-rolled pickled steel is higher than that of the hot-rolled plate, and part of the hot-rolled pickled steel even needs to be produced according to the quality requirement of the cold-rolled plate. Compared with the common hot rolled plate, the hot-rolled pickled plate removes the iron oxide scales on the surface, improves the surface quality, and is convenient for welding, oiling, electrophoresis and paint spraying. The hot-rolled pickled plate is used for replacing a corresponding cold-rolled plate, so that the production cost of an enterprise can be saved. At present, hot-rolled pickled steel mainly comprises cold-forming steel, structural steel, automobile structural steel, enamel steel and the like, and is widely applied to the industry fields of automobiles, compressors, general-purpose machines and the like.
In the development and production processes of hot-rolled pickled steel, the defects of blackening and color difference of the surface of part of hot-rolled strip steel after pickling are discovered, and the surface quality of a finished product is influenced. The defects gradually disappear after being rolled by cold rolling at a high reduction ratio, the influence on the surface quality of a finished product is small, but the defects have a large influence on hot-rolled pickled steel products which are 'cooled by heat'. The surface blackening and color difference defects not only affect the appearance of the product, but also cause adverse effects on subsequent processing and use (stamping, welding, coating and the like) of the product, bring about a series of problems in the application process of customers, cause complaints of users and reduce the market competitiveness of the product.
Generally speaking, there are many reasons causing the blackening of the surface of the pickled steel, such as "under pickling", "over pickling", the scale defects (local pressing, red scale, etc.) on the surface of the hot rolled strip, the structure selective corrosion during the pickling of the strip matrix, etc., but the current related research does not analyze the mechanism of the types of the causes of the blackening defects on the surface of the pickled steel and propose corresponding improvement measures: although the method of reducing the thickness of the iron scale, changing the structure of the iron scale, improving the transverse uniformity of the iron scale, flattening, straightening, pickling with tension, reducing the pickling speed and the like of the steel plate before pickling can obviously improve the whole or local blackening of the surface caused by the 'under-pickling' of the strip steel, the measures have no improvement effect on the blackening of the surface caused by the 'over-pickling', the iron scale defects (local pressing, red iron scales and the like) on the surface of the hot-rolled strip steel, the selective corrosion of the structure in the pickling process of the strip steel matrix and the like, and can even further reduce the surface quality of the pickled steel and reduce the production efficiency of the pickling process. The measure of adding the corrosion inhibitor in the pickling process can inhibit the excessive corrosion of the strip steel matrix in the acid liquor and improve the defects of blackening, color difference and the like of the strip steel surface, but the addition of the corrosion inhibitor can increase the production cost, reduce the pickling speed and possibly bring adverse effects to the natural environment. Therefore, work needs to be carried out to overcome the defects of blackening and color difference of the surface of the pickled steel product, improve the surface quality of the product, improve the competitiveness of the product, research the generation mechanism of the blackening and color difference of the surface of the pickled steel and provide a production method which is more targeted, more efficient, more energy-saving and more environment-friendly.
Disclosure of Invention
The invention aims to solve the technical problems and provides a production method for preventing the surface of hot-rolled pickled steel from blackening, which optimizes rolling and pickling processes on the basis of controlling the content of alloy elements and can effectively reduce the incidence of the surface blackening and color difference defects of strip steel.
The invention is realized in such a way that:
a production method for preventing the surface of hot-rolled pickled steel from blackening comprises the following process control:
smelting;
heating the plate blank: the total in-furnace time of the plate blank is 170-220 min, and the furnace temperature of the heating furnace is controlled to be 1280-1350 ℃;
hot rolling and rough rolling: controlling the finishing rolling temperature to be 1050-1110 ℃;
hot rolling and finish rolling: the first frame to the fourth frame all adopt high-speed steel rolls;
laminar cooling;
coiling: the steel coil is coiled at the temperature of 620-680 ℃ after being cooled by laminar flow;
acid washing: pickling the steel coil by a continuous pickling tank, wherein the pickling temperature is 70-85 ℃, the HCl concentration in the pickling tank is 80-200 g/L, and the speed of the steel belt is controlled within the range of 120-180 m/min during pickling;
and (5) drying.
The further scheme is as follows:
the hot-rolled pickled steel comprises the following components in percentage by mass:
0.09-0.12% of C, 0-0.20% of Si, 1.35-1.50% of Mn, 0-0.02% of P, and the balance of Fe and other inevitable impurities.
The further scheme is as follows:
the hot-rolled pickled steel comprises the following components in percentage by mass:
0.09-0.12% of C, 0.001-0.20% of Si, 1.35-1.50% of Mn, 0.001-0.02% of P and 0.001-0.01% of Cr; the balance being Fe and other unavoidable impurities.
Researches find that the proper content of Cr element and Si element is favorable for improving the high-temperature oxidation resistance of the hot-rolled pickled steel, the proper content of Si element is favorable for controlling the high-temperature oxidation speed of the hot-rolled pickled steel, however, when the content of Si is too high, a layer of high adhesion force is generated on the surface of the hot-rolled strip steel, and the main component is FeO/Fe2SiO4The eutectic mixture of (a) which is difficult to remove in the subsequent pickling process, easily causes blackening of the whole or part of the surface of the pickled steel. In addition, too high contents of Si and Mn may cause the hot rolled strip to be finish rolled in hot rollingIn the process, the rolling force is overlarge, so that an oxide film on the surface of a roller is damaged and falls off and is pressed into a strip steel substrate, and the surface of the pickled strip steel has the defect of overall or local blackening or pitted surface.
The further scheme is as follows:
the hot-rolled pickled steel comprises the following components in percentage by mass:
0.1 percent of C, 0.05 percent of Si, 1.35 percent of Mn, 0.005 percent of P and 0.008 percent of Cr; the balance being Fe and other unavoidable impurities.
In the invention, the finishing temperature is controlled to be 1050-1110 ℃. This is because when the rough rolling finishing temperature is too high, the third scale generated on the surface of the strip steel after entering the finish rolling area is too thick due to the too high temperature, and is difficult to completely remove in the subsequent descaling process. Meanwhile, the excessive thickness of the surface iron scale can also cause the iron scale to be broken and fall off, thereby accelerating the abrasion of the oxide film of the finish rolling working roll. Once the oxide film on the roll surface of the working roll is excessively worn and peeled off, the peeled oxide film on the roll surface is easily adhered to the surface of the hot-rolled strip steel and is rolled into the surface of the strip steel in a subsequent frame to form a third-time oxide scale defect, and the local pickling effect on the surface of pickled steel is poor in the subsequent pickling process, so that the surface of the pickled strip steel is blackened wholly or locally or has a pitted surface defect. On the other hand, if the rough rolling finishing temperature is too low, the rolling load (particularly, F1 to F3 stands) in the finish rolling stage becomes too large, and the oxide film on the roll surface of the finish rolling work roll is also abraded and peeled off to adhere to the surface of the hot rolled strip, thereby causing the surface of the strip to be blackened wholly or partially or to have pitted defects after pickling.
In the invention, the control of the coiling temperature of the hot-rolled strip steel is one of the key technical points of the invention. Researches find that in the cooling process after the hot rolled strip steel is coiled, the surface iron scale continues to grow and phase structure transformation occurs. If the curling temperature is too high, on one hand, because the strip steel has certain convexity, the edge part is thin, the middle part is thick, a certain gap is formed at the edge part of the steel coil, oxygen is fully supplied to the gap, the oxide scales at the edge part can continue to oxidize and grow, and Fe which is difficult to remove by acid pickling is easily formed at the edge part of the strip steel2O3Acid-pickled rear beltBlack band-shaped defects are easily generated at the edge of the steel; on the other hand, in the central part of the steel coil, because the steel coil is tightly coiled, oxygen supply is severely limited at the position, a series of phase structure transformation occurs on iron scales in the central part of the strip steel, and in the subsequent pickling process, the grain boundary part in the matrix of the steel coil is easy to selectively corrode, so that the whole surface of the pickled steel is blackened. Therefore, on the premise of ensuring the mechanical property of the strip steel, the coiling temperature is reduced as much as possible, and the blackening defect of the whole surface or the local surface of the strip steel after pickling can be effectively prevented.
In the invention, the speed control of the strip steel in the pickling process is one of the key technical points of the invention. The strip speed is too fast during pickling, so that the scale on the surface of the hot rolled strip steel cannot be thoroughly removed, namely the steel strip is not pickled, the scale on the surface is not thoroughly removed, the surface of the pickled steel is blackened, the appearance of a product is affected, and a series of problems in welding, coating and electrophoresis processes during use of a user are caused. On the other hand, if the strip speed is too slow during pickling, excessive corrosion of the grain boundary of the surface of the strip steel matrix is easily caused, so that the whole or local blacking of the surface of the pickled steel is caused, and along with the further reduction of the pickling strip speed, the pickling production efficiency is influenced, the selective corrosion of the grain boundary of the surface of the strip steel matrix is further aggravated, and the blackening degree of the surface of the pickled steel is more serious.
The further scheme is as follows:
in the slab heating process, the total in-furnace time of the slab is 180-200 min.
The time of the plate blank in the furnace must be controlled, if the heating time is too long, the scale on the surface of the steel blank is too thick, and the subsequent descaling is difficult, so that the surface of the pickled steel strip is blackened or has banded color difference defects, and the surface quality of the pickled steel is influenced. Meanwhile, the furnace temperature of the heating furnace is controlled to be 1280-1350 ℃, 0.001-0.20% of Si and 0.001-0.01% of Cr; controlling the scale on the surface of the billet to be within 2.0 mm. The scale having the thickness is uniformly removed by descaling during rolling to reduce the surface roughness.
The further scheme is as follows:
in the hot rolling finish rolling process, the use frequency of a high-speed steel roller is controlled to be less than or equal to 2 times.
The further scheme is as follows:
the temperature of the dryer gas in the drying process is 110-130 ℃.
The invention has at least the following beneficial effects:
1. the invention discloses a production method for preventing the surface of hot-rolled pickled steel from blackening, which controls alloy elements within a reasonable range, specifically 0.001-0.20% of Si, 0.001-0.02% of P and 0.001-0.01% of Cr, so that the adhesive force of the oxide scale of strip steel is obviously reduced on the basis of properly improving the high-temperature oxidation resistance of the hot-rolled pickled steel, and the oxide scale is easy to remove during pickling so as to avoid the surface from generating the blackening defect;
2. the method designed by the invention combines specific process control on the basis of controlling the content of the alloy elements, such as strictly controlling the heating temperature, the heating time, the hot rolling rough rolling final rolling temperature and the finish rolling process, particularly the curling temperature of the plate blank, and then combining pickling process parameters, particularly the probability of local or overall blackening defects on the surface of pickled steel is greatly reduced after strictly controlling the strip speed during pickling;
3. the method designed by the invention can be realized on the existing hot continuous rolling production line and pickling production line, no new equipment investment is needed, and the production efficiency of the pickling process is effectively improved; the thickness specification of the obtained product covers a part of the cold-rolled product, so the product has an application prospect of replacing part of the cold-rolled product, and the production cost can be greatly reduced for users; the hot-rolled pickled steel product produced and processed by the method has good surface quality, has no adverse effect on the working procedures of stamping forming, paint spraying, electrophoresis and the like of a user, and the surface quality of the processed part is good;
4. the pickling process of the method does not need to add a pickling inhibitor, thereby improving the pickling production efficiency, reducing the production cost and simultaneously reducing the adverse effect on the natural environment.
Drawings
FIG. 1 is a macroscopic view of the surface of pickled steel obtained in example 1 of the present invention;
FIG. 2 is a surface micro-topography of pickled steel obtained in example 1 of the present invention;
FIG. 3 is a macro topography map of the surface of pickled steel obtained in example 2 of the present invention;
FIG. 4 is a surface micro-topography of pickled steel obtained in example 2 of the present invention;
FIG. 5 is a macro topography of the surface of pickled steel obtained in comparative example 1 of the present invention;
FIG. 6 is a surface micro-topography of pickled steel obtained in comparative example 1 of the present invention;
FIG. 7 is a macro topography of the surface of pickled steel obtained in comparative example 2 of the present invention;
FIG. 8 is a surface micro-topography of pickled steel obtained in comparative example 2 of the present invention;
FIG. 9 is a macro topography of the surface of pickled steel obtained in comparative example 3 of the present invention;
FIG. 10 is a surface micro-topography of pickled steel obtained in comparative example 3 of the present invention;
FIG. 11 is a macro topography of the surface of pickled steel obtained in comparative example 4 of the present invention;
FIG. 12 is a surface micro-topography of pickled steel obtained in comparative example 4 of the present invention.
Detailed Description
The invention discloses a production method for preventing the surface of hot-rolled pickled steel from blackening, which comprises the following specific process controls:
smelting;
heating the plate blank: the total in-furnace time of the plate blank is 170-220 min, and the furnace temperature of the heating furnace is controlled to be 1280-1350 ℃;
hot rolling and rough rolling: controlling the finishing rolling temperature to be 1050-1110 ℃;
hot rolling and finish rolling: the first frame to the fourth frame all adopt high-speed steel rolls, and the use times of the high-speed steel rolls are controlled to be less than or equal to 2 times;
laminar cooling;
curling: the steel coil is coiled at the temperature of 620-680 ℃ after being cooled by laminar flow;
acid washing: pickling the steel coil by a continuous pickling tank, wherein the pickling temperature is 70-85 ℃, the HCl concentration in the pickling tank is 80-200 g/L, and the speed of the steel belt is controlled within the range of 120-180 m/min during pickling;
drying: the temperature of the dryer gas is 110-130 ℃.
In order to better explain the invention, the following further illustrate the main content of the invention in connection with specific examples, but the content of the invention is not limited to the following examples.
Example 1
The embodiment discloses a production method for preventing the surface of hot-rolled pickled steel from blackening, wherein the hot-rolled pickled steel comprises the following components in percentage by mass:
0.09 percent of C, 0.10 percent of Si, 1.35 percent of Mn, 0.005 percent of P and 0.001 percent of Cr; the balance being Fe and other unavoidable impurities.
Wherein the specific process control is shown in table 1;
example 2
The embodiment discloses a production method for preventing the surface of hot-rolled pickled steel from blackening, wherein the hot-rolled pickled steel comprises the following components in percentage by mass:
0.12 percent of C, 0.20 percent of Si, 1.45 percent of Mn, 0.02 percent of P and 0.01 percent of Cr; the balance being Fe and other unavoidable impurities.
Wherein the specific process control is shown in table 1;
comparative example 1
The embodiment discloses a production method for preventing the surface of hot-rolled pickled steel from blackening, wherein the hot-rolled pickled steel comprises the following components in percentage by mass:
0.12 percent of C, 0.50 percent of Si, 1.50 percent of Mn, 0.02 percent of P and 0.01 percent of Cr; the balance being Fe and other unavoidable impurities.
Wherein the specific process control is shown in table 1;
comparative example 2
The embodiment discloses a production method for preventing the surface of hot-rolled pickled steel from blackening, wherein the hot-rolled pickled steel comprises the following components in percentage by mass:
0.12 percent of C, 0.20 percent of Si, 1.40 percent of Mn, 0.015 percent of P and 0.01 percent of Cr; the balance being Fe and other unavoidable impurities.
Wherein the specific process control is shown in table 1;
comparative example 3
The embodiment discloses a production method for preventing the surface of hot-rolled pickled steel from blackening, wherein the hot-rolled pickled steel comprises the following components in percentage by mass:
0.12 percent of C, 018 percent of Si, 1.45 percent of Mn, 0.02 percent of P and 0.01 percent of Cr; the balance being Fe and other unavoidable impurities.
Wherein the specific process control is shown in table 1;
comparative example 4
The embodiment discloses a production method for preventing the surface of hot-rolled pickled steel from blackening, wherein the hot-rolled pickled steel comprises the following components in percentage by mass:
0.12 percent of C, 0.18 percent of Si, 1.50 percent of Mn, 0.02 percent of P and 0.01 percent of Cr; the balance being Fe and other unavoidable impurities.
Wherein the specific process control is shown in table 1;
TABLE 1 list of process controls for examples and comparative examples
As can be seen from the examples 1 and 2 in Table 1, the hot-rolled pickled steel obtained by the design method of the invention has good surface quality, no blackening or color difference defects, and good appearance quality, and can meet the use conditions of stamping, electrophoresis, coating and the like of users.
Wherein, the macro-photo and the micro-topography of the surface of the hot-rolled pickled steel obtained in the above examples 1 and 2 are respectively shown in fig. 1 to 4, as can be seen from fig. 1 to 4, the pickled steel surface is silvery and bright and has no blackening, pitted surface or color difference defects, i.e. the surface quality is better. And the micro-topography in the right picture shows that the micro-topography of the surface of the acid-washed steel is smooth and continuous.
The surface macro-photograph and surface micro-topography of the pickled steel obtained in the above comparative example 1 are shown in FIGS. 5 and 65. 6, the surface of the pickled steel is dark and gray, and it can be seen from the micro-topography that the surface is rough, and holes and ravines are generated at the grain boundaries of some regions. This is probably because the Si content in the steel is too high, a layer of high adhesion is formed on the surface of the hot-rolled strip steel, the main component of which is FeO/Fe2SiO4The eutectic mixture of (a) is difficult to completely remove in the subsequent pickling process, and easily causes the whole or partial blackening of the surface of the pickled steel.
The surface macro-photograph and the surface micro-topography of the pickled steel obtained in the comparative example 2 are shown in fig. 7 and 8, and it can be seen from fig. 7 and 8 that pitted surface defects are generated on the surface of the pickled steel, and it can be seen from the micro-topography that a large amount of fine oxides are embedded in the surface of the strip steel matrix. This is probably because the rough rolling and finish rolling temperature is too high, so that the third scale generated on the surface of the strip steel is too thick after entering the finish rolling area due to the too high temperature, and the wear of the oxide film of the finish rolling working roll is accelerated due to the crushing and falling of the scale. When the oxide film on the roll surface of the working roll is excessively worn and peeled off, the peeled oxide film on the roll surface is easily adhered to the surface of the hot-rolled strip steel and is rolled into the surface of the strip steel in a subsequent rack, and the pitted surface defect of the surface of the acid-washed steel is caused in the subsequent acid washing process.
The surface macro-photograph and the surface micro-topography of the pickled steel obtained in the above comparative example 3 are shown in fig. 9 and 10, and it can be seen from fig. 9 and 10 that the pickled steel surface is gray, and the micro-topography shows that the degree of grain boundary corrosion is severe, and a gully-like topography is formed. This is probably because the coiling temperature is too high, the iron scale on the surface of the strip steel has a series of phase structure transformation in the cooling process, and the grain boundary part in the matrix of the strip steel has selective corrosion in the subsequent pickling process, so that the whole surface of the pickled steel is blackened.
The surface macro-photograph and the surface micro-topography of the pickled steel obtained in the above comparative example 4 are shown in fig. 11 and 12, and it can be seen from fig. 11 and 12 that the pickled steel surface is gray black, and the micro-topography shows that the degree of grain boundary corrosion is severe, thereby forming a gully-like morphology, and a large number of micro-voids are generated on the grain surface. This is probably because the strip speed is too slow during pickling, which easily causes excessive corrosion of grain boundaries on the surface of the matrix of the strip steel, thereby causing the whole or partial blackening of the surface of the pickled steel, and with further reduction of the pickling strip speed, the selective corrosion of the grain boundaries on the surface of the matrix of the strip steel is further aggravated, and the blackening degree of the surface of the pickled steel is more serious.
Although the present invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be preferred embodiments of the present invention, it is to be understood that the invention is not limited thereto, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.
Claims (7)
1. The production method for preventing the surface of the hot-rolled pickled steel from blackening is characterized by comprising the following process controls:
smelting;
heating the plate blank: the total in-furnace time of the plate blank is 170-220 min, and the furnace temperature of the heating furnace is controlled to be 1280-1350 ℃;
hot rolling and rough rolling: controlling the finishing rolling temperature to be 1050-1110 ℃;
hot rolling and finish rolling: the first frame to the fourth frame all adopt high-speed steel rolls;
laminar cooling;
coiling: the steel coil is coiled at the temperature of 620-680 ℃ after being cooled by laminar flow;
acid washing: pickling the steel coil by a continuous pickling tank, wherein the pickling temperature is 70-85 ℃, the HCl concentration in the pickling tank is 80-200 g/L, and the speed of the steel belt is controlled within the range of 120-180 m/min during pickling;
and (5) drying.
2. The production method for preventing blackening of the surface of hot-rolled pickled steel according to claim 1, characterized in that:
the hot-rolled pickled steel comprises the following components in percentage by mass:
0.09-0.12% of C, 0-0.20% of Si, 1.35-1.50% of Mn, 0-0.02% of P, and the balance of Fe and other inevitable impurities.
3. The production method for preventing blackening of the surface of hot-rolled pickled steel according to claim 1, characterized in that:
the hot-rolled pickled steel comprises the following components in percentage by mass:
0.09-0.12% of C, 0.001-0.20% of Si, 1.35-1.50% of Mn, 0.001-0.02% of P and 0.001-0.01% of Cr; the balance being Fe and other unavoidable impurities.
4. The production method for preventing blackening of the surface of hot-rolled pickled steel according to claim 1, characterized in that:
the hot-rolled pickled steel comprises the following components in percentage by mass:
0.1 percent of C, 0.05 percent of Si, 1.35 percent of Mn, 0.005 percent of P and 0.008 percent of Cr; the balance being Fe and other unavoidable impurities.
5. The production method for preventing blackening of the surface of hot-rolled pickled steel according to any one of claims 1 to 4, characterized by:
in the slab heating process, the total in-furnace time of the slab is 180-200 min.
6. The production method for preventing blackening of the surface of hot-rolled pickled steel according to any one of claims 1 to 4, characterized by:
in the hot rolling finish rolling process, the use frequency of a high-speed steel roller is controlled to be less than or equal to 2 times.
7. The production method for preventing blackening of the surface of hot-rolled pickled steel according to any one of claims 1 to 4, characterized by:
the temperature of the dryer gas in the drying process is 110-130 ℃.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113145642A (en) * | 2021-04-01 | 2021-07-23 | 首钢京唐钢铁联合有限责任公司 | Pickling plate and preparation method thereof |
| CN113151836A (en) * | 2021-03-10 | 2021-07-23 | 武汉钢铁有限公司 | Corrosion inhibitor suitable for hot-rolled pickled steel, preparation method and application |
| CN113549921A (en) * | 2021-06-24 | 2021-10-26 | 武汉钢铁有限公司 | Corrosion inhibitor for preventing surface of hot-rolled pickled steel from blackening and preparation method thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59113901A (en) * | 1982-12-20 | 1984-06-30 | Kawasaki Steel Corp | Method for decreasing wear of working roll for hot rolled steel strip |
| CN102266868A (en) * | 2011-08-05 | 2011-12-07 | 河北钢铁股份有限公司邯郸分公司 | Production method for pickling steel with reduced acid |
| CN102925791A (en) * | 2012-11-05 | 2013-02-13 | 武汉钢铁(集团)公司 | Steel easy to pickle and production method of steel |
| CN104826872A (en) * | 2015-05-15 | 2015-08-12 | 东北大学 | Rolling controlling method for eliminating surface chromatic aberration defect of hot-rolled strip steel |
| CN107252821A (en) * | 2017-05-15 | 2017-10-17 | 河钢股份有限公司邯郸分公司 | A kind of hot-rolled structural steel production method that can avoid producing the black steel defect of pickling |
| CN107419176A (en) * | 2017-08-07 | 2017-12-01 | 武汉钢铁有限公司 | Hot rolling acid-cleaning steel and manufacture method with great surface quality and tensile strength 490MPa levels |
| CN108728747A (en) * | 2017-04-13 | 2018-11-02 | 新疆八钢铁股份有限公司 | A method of eliminating the surfaces beam steel B510L grey black |
| CN109097700A (en) * | 2018-09-26 | 2018-12-28 | 马鞍山钢铁股份有限公司 | A kind of easy pickling mild steel steel plate of CSP process and its manufacturing method |
| CN109136739A (en) * | 2018-06-29 | 2019-01-04 | 唐山钢铁集团有限责任公司 | The control method of dual phase steel cold rolling high strength car sheet paintable energy surface quality |
| CN110369528A (en) * | 2019-07-09 | 2019-10-25 | 张家港扬子江冷轧板有限公司 | A method of improving DC01 strip pickling speed |
-
2020
- 2020-05-13 CN CN202010404163.1A patent/CN111575465A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59113901A (en) * | 1982-12-20 | 1984-06-30 | Kawasaki Steel Corp | Method for decreasing wear of working roll for hot rolled steel strip |
| CN102266868A (en) * | 2011-08-05 | 2011-12-07 | 河北钢铁股份有限公司邯郸分公司 | Production method for pickling steel with reduced acid |
| CN102925791A (en) * | 2012-11-05 | 2013-02-13 | 武汉钢铁(集团)公司 | Steel easy to pickle and production method of steel |
| CN104826872A (en) * | 2015-05-15 | 2015-08-12 | 东北大学 | Rolling controlling method for eliminating surface chromatic aberration defect of hot-rolled strip steel |
| CN108728747A (en) * | 2017-04-13 | 2018-11-02 | 新疆八钢铁股份有限公司 | A method of eliminating the surfaces beam steel B510L grey black |
| CN107252821A (en) * | 2017-05-15 | 2017-10-17 | 河钢股份有限公司邯郸分公司 | A kind of hot-rolled structural steel production method that can avoid producing the black steel defect of pickling |
| CN107419176A (en) * | 2017-08-07 | 2017-12-01 | 武汉钢铁有限公司 | Hot rolling acid-cleaning steel and manufacture method with great surface quality and tensile strength 490MPa levels |
| CN109136739A (en) * | 2018-06-29 | 2019-01-04 | 唐山钢铁集团有限责任公司 | The control method of dual phase steel cold rolling high strength car sheet paintable energy surface quality |
| CN109097700A (en) * | 2018-09-26 | 2018-12-28 | 马鞍山钢铁股份有限公司 | A kind of easy pickling mild steel steel plate of CSP process and its manufacturing method |
| CN110369528A (en) * | 2019-07-09 | 2019-10-25 | 张家港扬子江冷轧板有限公司 | A method of improving DC01 strip pickling speed |
Non-Patent Citations (2)
| Title |
|---|
| 孙蓟泉等: "带钢表面氧化缺陷的产生与预防", 《鞍钢技术》 * |
| 梁轩等: "卷取温度对冷轧双相钢组织性能的影响", 《物理测试》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113151836A (en) * | 2021-03-10 | 2021-07-23 | 武汉钢铁有限公司 | Corrosion inhibitor suitable for hot-rolled pickled steel, preparation method and application |
| CN113151836B (en) * | 2021-03-10 | 2022-12-23 | 武汉钢铁有限公司 | Corrosion inhibitor suitable for hot-rolled pickled steel, preparation method and application |
| CN113145642A (en) * | 2021-04-01 | 2021-07-23 | 首钢京唐钢铁联合有限责任公司 | Pickling plate and preparation method thereof |
| CN113549921A (en) * | 2021-06-24 | 2021-10-26 | 武汉钢铁有限公司 | Corrosion inhibitor for preventing surface of hot-rolled pickled steel from blackening and preparation method thereof |
| CN113549921B (en) * | 2021-06-24 | 2022-11-29 | 武汉钢铁有限公司 | Corrosion inhibitor for preventing blackening of surface of hot-rolled pickled steel and preparation method thereof |
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