CN111389927B - Narrow thickness tolerance control method for thin steel plate of single-stand steckel mill - Google Patents
Narrow thickness tolerance control method for thin steel plate of single-stand steckel mill Download PDFInfo
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- CN111389927B CN111389927B CN202010146267.7A CN202010146267A CN111389927B CN 111389927 B CN111389927 B CN 111389927B CN 202010146267 A CN202010146267 A CN 202010146267A CN 111389927 B CN111389927 B CN 111389927B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/18—Automatic gauge control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/24—Automatic variation of thickness according to a predetermined programme
Abstract
The invention discloses a narrow thickness tolerance control method for a thin-specification steel plate of a single-stand steckel mill, which is characterized in that the design, planning, arrangement, heating and rolling processes of a blank material shape produced by the steel plate of the single-stand steckel mill are optimized, and the stable production of the narrow thickness tolerance steel plate of 0.2mm by the single-stand steckel mill is realized by controlling the aspects of the design of the blank material shape of the thin-specification steel plate, the heating temperature of a heating furnace, the rolling speed in the rolling process, the rolling rhythm, AGC amplitude limiting and the like. The narrow thickness tolerance control method for the thin-specification steel plate of the single-stand steckel mill realizes the stable control of the narrow thickness tolerance of the thin-specification steel plate of the single-stand steckel mill, improves the yield of the 0.2mm narrow thickness tolerance of the thin-specification steel plate of the single-stand steckel mill, reduces the mass unqualified product judgment of the narrow thickness tolerance order of the single-stand steckel mill due to the problem of thickness overrun, and improves the economic benefit and market competitiveness of enterprises.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a steel rolling process of a thin-specification steel plate of a single-stand steckel mill.
Background
The wide and thin steel plates with the width of 2400-. The single-stand steckel mill has the advantages of wide and thin rolling specifications compared with the conventional heavy and medium plate rolling mill due to the mode of heat preservation rolling of the large blank curling furnace, but is also influenced by the partial length of a rolled piece, and the thin and narrow thickness tolerance is more difficult to effectively control.
Taking the thin gauge steel plate for the large cruise ship as an example, when the structural design of the large cruise ship is determined, the thickness tolerance of the steel plate becomes the only factor influencing the structural weight for loading more rooms, amusement facilities and the like under the condition of the same water discharge amount. Each large cruise ship needs about 1 ten thousand tons of wide and thin steel plates with the thickness of 4.5-6mm and the width of 2400-. However, the thin-gauge steel plate with the thickness less than 6mm in China is mainly a rolled plate produced by a hot continuous rolling mill, so that the problems of narrow supply width (the maximum is only 2100mm), large internal stress and the like exist, the construction requirement of the mail steamer cannot be met, only a few steel enterprises in Japan, Europe and the like can carry out batch production in the world at present, the domestic steel enterprises cannot produce the same products, the market is almost monopolized by foreign enterprises, and the development of the mail steamer manufacturing industry in China is severely restricted.
Disclosure of Invention
The invention provides a blank material type design, planning and arrangement, heating and rolling control process for producing a thin steel plate by a single-stand steckel mill, aiming at solving the problem of controlling the narrow thickness tolerance of the thin steel plate produced by the single-stand steckel mill.
The technical scheme for realizing the aim of the invention is as follows:
a narrow thickness tolerance control method for a thin-specification steel plate of a single-stand steckel mill is characterized in that the design, planning, heating and rolling processes of a blank material type produced by the steel plate of the single-stand steckel mill are optimized, and the single-stand steckel mill can stably produce the 0.2mm narrow thickness tolerance steel plate by controlling the aspects of the blank material type design, the heating temperature of a heating furnace, the rolling speed in the rolling process, the rolling rhythm, AGC (automatic gain control) amplitude limit and the like of the thin-specification steel plate.
The optimization of the blank material type design comprises the following steps:
(1) the thickness of the steel plate is 5-6mm, the material type design of a single-stand steckel mill rolling mode is adopted, the blank length is 8000-8600mm, the requirement of double-row material distribution and steel loading of a 1# heating furnace matched with a rolling line is met, and the length of a rolled piece is less than or equal to 250 m;
(2) the thickness of the steel plate is more than 6mm and less than or equal to 11.5mm, the material type design of a single-frame steckel mill rolling mode is adopted, the blank length is 16000-17600mm, the requirement of single-row material distribution and steel loading of a 1# heating furnace matched with a rolling line is met, the maximum material type design is adopted, and the length of a rolled piece is less than or equal to 350 m.
The design of the steel plate profiles with different thicknesses is mainly influenced by the rolling stability of different thickness specifications, the maximum profile design, namely the maximum rolled piece length design, is adopted while the rolling stability is ensured, the 5-6mm single-rack steckel mill can realize stable production within 250m of the rolled piece length, and the stability of the rolled piece length exceeding 250m is obviously deteriorated.
Optimization of the planning includes:
(1) the thin-specification narrow-thickness tolerance steel plates are arranged in an early stage of a working roll period at 300 t-1000 t (the roll is worn in the whole roll period production process, and thickness control and plate shape are influenced after the roll is worn to a certain degree, so that production in the interval is limited);
(2) before the production of the thin-specification narrow-thickness tolerance steel plate, 2-4 transitional blanks are adopted to produce and adjust thickness deviation control;
the optimization of the heating and rolling process comprises:
(1) heating temperature of the heating furnace: the heating temperature of the heating furnace is increased to 1230 +/-20 ℃, the head and tail temperature of the blank is increased by 10-20 ℃ compared with the temperature of the body by adjusting the power of the burners of the heating section, and the temperature drop loss caused by the fact that the head and the tail of the rolled piece are exposed outside the curling furnace in the rolling process is compensated;
(2) the on-furnace time of the heating furnace: blanks heated simultaneously in the 1# heating furnace and required by the narrow thickness tolerance of the thin specification are uniformly controlled according to the heating temperature of 1230 +/-20 ℃, and heating schedules and the same blank thickness of other heating furnaces produced simultaneously are intensively arranged, so that the heating temperature waiting time caused by heating temperature conversion and the like is reduced, and basic conditions are created for the continuous and stable rolling production of a rolling mill;
(3) rolling schedule: arranging a rolling schedule according to a minimum pass rolling principle while ensuring the shape of the rolled piece, and adjusting a secondary rolling speed deviation value to accelerate the rolling speed so as to improve the rolling temperature and reduce the influence of head and tail temperature drop loss on the head and tail thickness control of the rolled piece in the rolling process;
(4) the temperature of the curling furnace: during the production of the thin-specification narrow-thickness-tolerance steel plate, the temperature of the curling furnace is increased to over 920 ℃ from about 880 ℃ of normal rolling, and the influence of head and tail temperature drop loss on the head and tail thickness control of a rolled piece in the rolling process is reduced;
(5) AGC amplitude limiting: during the production of the steel plate with the thin specification and narrow thickness tolerance requirements, the AGC amplitude limit is adjusted from (-2, +2) to (-4, +6) in normal rolling, so that the problems of insufficient AGC compensation and obvious deviation of the thickness of a rolled piece caused by low rolling force due to low head and tail temperature of the rolled piece in the aspect of AGC control are reduced.
Preferably, the rolling tonnage of the thin gauge narrow thickness tolerance steel plate in one working roll period does not exceed 500 t. (mainly from the perspective of narrow thickness tolerance band in rolling production, the roller period arrangement requirement is limited, and the thickness fluctuation caused by the alternation of the roller period length and the width is reduced)
Preferably, the width difference between the blank of other heating furnaces produced simultaneously and the blank required by the narrow thickness tolerance of the produced thin specification is less than or equal to 400 mm. (mainly from the perspective of narrow thickness tolerance band in rolling production, the roller period arrangement requirement is limited, and the thickness fluctuation caused by the alternation of the roller period length and the width is reduced)
Preferably, the thickness difference between the transition blank production steel plate and the thin-specification narrow-thickness-tolerance steel plate is controlled within 2 mm. (achieving narrow thickness tolerance plate thickness hit by limiting transition blank thickness difference)
Preferably, the deviation value of the secondary rolling speed is adjusted to 1.0, and the rolling speed is increased to more than 6 m/s.
The method for controlling the narrow thickness tolerance of the thin-specification steel plate of the single-stand steckel mill realizes the stable control of the narrow thickness tolerance of the thin-specification steel plate of the single-stand steckel mill by optimizing the aspects of blank material type design, planning arrangement, heating, rolling process and the like, improves the yield of the 0.2mm narrow thickness tolerance of the thin-specification steel plate of the single-stand steckel mill, reduces the mass unqualified product judgment of the narrow thickness tolerance order of the single-stand steckel mill due to the problem of thickness overrun, and improves the economic benefit and market competitiveness of enterprises.
Drawings
FIG. 1 is a comparison of the thickness of a single-stand steckel mill before the narrow thickness tolerance control method for thin gauge steel plates is generalized;
FIG. 2 is a thickness comparison of a single-stand steckel mill after a narrow thickness tolerance control method for thin gauge steel plates is popularized.
Detailed Description
The technical solution of the present invention is further described in detail below.
In the embodiment, the rolling order thickness is selected to be 5mm BV-A36, and the whole production process is controlled as follows:
(1) the specific material type design is shown in table 1, 1# heating furnace double-row steel loading;
TABLE 1 material type design data
(2) Planning and arranging: the two rolled pieces start to be produced after 512 tons in the early stage of the working roll period, the arrangement is controlled within 1000t in the early stage of the working roll period, 2 BV A36 with the thickness of 5mm is taken as a transition blank for adjusting the thickness deviation in the 1# heating furnace 2 before production, and the blank width of the 2# heating furnace 3068 and 3098mm are simultaneously produced and are both required by a heating system at 1180 +/-20 ℃.
(3) The specific heating process control of the heating furnace is shown in Table 2.
TABLE 2 control data of heating process of heating furnace
(4) Rolling schedule arrangement
And arranging a rolling schedule according to a minimum pass rolling principle while ensuring the plate shape, and accelerating the rolling speed by adjusting a secondary rolling speed deviation value. The specific rolling process control parameters are shown in table 3.
TABLE 3 Rolling schedule layout related data
(5) The temperature of the curling furnace is raised 2 hours in advance, the temperature of the curling furnace is 923-928 ℃ in the rolling process of the embodiment, and the AGC amplitude limit is adjusted to (-4, +6) before the transition plate is produced.
(6) Effect display
The comparison effect of the thickness before and after the narrow thickness tolerance control method for the thin-specification steel plate is popularized is shown in attached figures 1 and 2. Comparing BV-A36 thickness control level before and after the process is popularized and combining with corresponding control process analysis, the stable control of narrow thickness tolerance of thin specification steel plate of single-stand steckel mill can be realized by adopting the optimized control mode of blank material type design, planning, heating and rolling process and the like.
Claims (4)
1. A narrow thickness tolerance control method for a thin steel plate of a single-stand steckel mill is characterized in that the design, planning, heating and rolling processes of a blank material type produced by the steel plate of the single-stand steckel mill are optimized to realize the stable production of the narrow thickness tolerance steel plate of 0.2mm by the single-stand steckel mill, wherein,
the optimization of the blank material type design comprises the following steps:
(1) the thickness of the steel plate is 5-6mm, the material type design of a single-stand steckel mill rolling mode is adopted, the blank length is 8000-8600mm, the requirement of double-row material distribution and steel loading of a 1# heating furnace matched with a rolling line is met, and the length of a rolled piece is less than or equal to 250 m;
(2) the thickness of the steel plate is more than 6mm and less than or equal to 11.5mm, the material type design is adopted in a rolling mode of a single-rack steckel mill, the blank length is 16000-17600mm, the requirement of single-row material distribution and steel loading of a 1# heating furnace matched with a rolling line is met, the maximum material type design is adopted, namely the maximum rolled piece length design is adopted, and the rolled piece length is less than or equal to 350 m;
optimization of the planning includes:
(1) the thin-specification narrow-thickness tolerance steel plates are concentrated in the early rolling tonnage of 300-1000 t in the working roll period;
(2) before the production of the thin-specification narrow-thickness tolerance steel plate, 2-4 transitional blanks are adopted to produce and adjust thickness deviation control;
the optimization of the heating and rolling process comprises:
(1) heating temperature of the heating furnace: the heating temperature is 1230 +/-20 ℃, and the head and tail temperature of the blank is 10-20 ℃ higher than the body temperature by adjusting the power of the burner of the heating section;
(2) the on-furnace time of the heating furnace: the blanks heated simultaneously in the 1# heating furnace and the narrow thickness tolerance requirement of the thin specification are uniformly controlled according to the heating temperature of 1230 +/-20 ℃, and the heating schedules and the same blank thickness of other heating furnaces produced simultaneously are intensively arranged;
(3) rolling schedule: arranging a rolling schedule according to a minimum pass rolling principle while ensuring the plate shape, and adjusting a secondary rolling speed deviation value to increase the rolling speed to more than 6 m/s;
(4) the temperature of the curling furnace: during the production of the steel plate with thin specification and narrow thickness tolerance, the temperature of the curling furnace is increased to over 920 ℃;
(5) AGC amplitude limiting: during the production of thin gauge narrow thickness tolerance steel plates, the AGC clipping is adjusted to (-4 mm, +6 mm).
2. The narrow gauge tolerance control method for thin gauge sheet steel for a single stand steckel mill as claimed in claim 1, wherein the rolling tonnage of the thin gauge narrow gauge tolerance sheet steel does not exceed 500 tons for one work roll period.
3. The narrow thickness tolerance control method of a single-stand steckel mill thin gauge steel plate as claimed in claim 1, wherein the width difference between the blank width of other heating furnaces produced simultaneously and the blank width required for producing the narrow thickness tolerance of the thin gauge is less than or equal to 400 mm.
4. The narrow thickness tolerance control method of a single stand steckel mill thin gauge steel plate of claim 1, wherein the difference in plate thickness between the transition blank production steel plate and the thin gauge narrow thickness tolerance steel plate is controlled to within 2 mm.
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| CN111889512B (en) * | 2020-08-12 | 2021-12-17 | 宝武集团鄂城钢铁有限公司 | Method for producing thin steel plate by single-stand rolling mill |
| CN112474800A (en) * | 2020-10-21 | 2021-03-12 | 南京钢铁股份有限公司 | Method for producing narrow thickness tolerance X12Ni5 steel by single-stand steckel mill |
| CN112588835B (en) * | 2020-11-19 | 2022-07-08 | 北京科技大学设计研究院有限公司 | AGC starting time control method for '1 + 3' furnace coil rolling line steckel mill |
| CN112620356B (en) * | 2020-12-28 | 2022-04-12 | 山东钢铁集团日照有限公司 | Thin-specification rolling steel plate drift control method for single-stand steckel mill |
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| JPH0890029A (en) * | 1994-09-27 | 1996-04-09 | Kawasaki Steel Corp | Method and device for controlling thickness of metallic strip |
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