CN110548763A - Method for reducing buckling of thick plate - Google Patents
Method for reducing buckling of thick plate Download PDFInfo
- Publication number
- CN110548763A CN110548763A CN201910778497.2A CN201910778497A CN110548763A CN 110548763 A CN110548763 A CN 110548763A CN 201910778497 A CN201910778497 A CN 201910778497A CN 110548763 A CN110548763 A CN 110548763A
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- rolling
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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
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
-
- 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
- B21B2001/225—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 by hot-rolling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a method for reducing buckling of a thick plate, relates to the technical field of thick plate production, is mainly applied to reducing buckling of the thick plate, solves the problem of power consumption of the processes of buckling, watering and cooling buckling and straightening and flattening return in the rolling process aiming at the production of a steel plate with the thickness of more than 50mm, and effectively controls the buckling of the steel plate with the thickness of more than or equal to 50mm after the steel plate is used.
Description
Technical Field
the invention relates to the technical field of thick plate production, in particular to a method for reducing buckling of a thick plate.
background
the number of thick plates with the thickness of more than 50mm produced by a wide plate factory per month reaches tens of thousands of tons, the buckling incidence rate is more than 20%, namely the buckling number of the thick plates per month is thousands of tons, the plate type rescue cost of the subsequent procedure is increased, and other surface quality risks can occur in the flattening rescue process to influence contract redemption. The plate shape saving task of each month is difficult, a large amount of manpower and material resources are consumed, the buckling defect of the plate shape becomes a heavy burden of manufacturers, and therefore the control of the rolled plate shape needs to be attacked and solved urgently.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a method for reducing buckling of a thick plate, comprising
P1, heating
Setting the temperature of the lower surface of the target steel tapping to be 10-30 ℃ lower than the temperature of the upper surface and the temperature uniformity to be less than or equal to 10 ℃;
P2 rolling reduction
Controlling the middle upper limit of the final rolling temperature, and controlling the leveling force to be 500-800 tons; on the premise of ensuring that the rolling force is not less than 24000kN, controlling the final rolling force of the finish rolling to be as small as possible, and controlling the final reduction rate of the finish rolling to be not more than 8%; the rolling speed is less than or equal to 3.0 m/s;
P3 rolling warping buckle adjustment
After the intermediate billet is penetrated by water, rolling is started after the intermediate billet is returned to red for more than 60 s; according to different conditions of multi-billet rolling, adjusting the buckle head by adjusting the speed ratio of the upper and lower rollers and the height of a rolling line;
p4, Prerectification and ACC watering cooling
manually intervening to reduce the roll gap by 0.5-1.0 mm when the tail of the straightening steel plate is pre-straightened;
Optimizing a water ratio model: w is not more than 2700, h is less than 45, and the water ratio is 1.15; h is more than or equal to 45, and the water ratio is 1.30;
W is more than 2700 and less than 3500, h is less than 45, and the water ratio is 1.25; h is more than or equal to 45, and the water ratio is 1.35;
W is more than or equal to 3500 and less than or equal to 4850, h is less than 45, and the water ratio is 1.35; h is more than or equal to 45, and the water ratio is 1.40;
head and tail flow shielding: 1-5 groups, 6-8 groups, 9-11 groups and 12-14 groups of lower collecting pipes, wherein the head shielding coefficients are all 0.8, and the head shielding positions are all 3000 mm;
p5, straightening by warm straightening
The cold bed automatically and quickly passes through a steel plate and a straightening machine for high-temperature straightening, and the straightening temperature is ensured to be more than or equal to 450 ℃; the straightening pass is more than or equal to 3 passes, and the straightening force is 15000 kN-20000 kN.
the technical effects are as follows: the method mainly optimizes the heating temperature uniformity, the rolling plate shape control (buckling head, reduction rate, leveling pass and final rolling temperature), the watering cooling control and the straightening method, forms a set of complete scheme to solve the problem of high buckling probability of the thick plate, improves the primary qualified rate of the plate shape, and reduces the plate shape saving cost of the subsequent process.
The technical scheme of the invention is further defined as follows:
In the method for reducing buckling of the thick plate, in P2, if the warping in the rolling process is not controlled, one rolling pass is increased, and the pass reduction rate is reduced.
In the method for reducing buckling of the thick plate, in P2, the thickness of the intermediate blank is controlled according to the minimum control of the process range.
The method for reducing buckling of the thick plate is the same as that of the method in P2 for reducing buckling of the thick plate in the same specification.
In the method for reducing buckling of the thick plate, in the P3, the same penetration of the blanks with the same specification is ensured.
in the method for reducing buckling of the thick plate, P3, the second-stage rolling temperature of the same specification is ensured to be consistent.
In the method for reducing buckling of the thick plate, in P3, the speed ratio of the upper roller to the lower roller ranges from 1.0 to 10.0, and the height of the rolling line ranges from 805 mm to 815 mm.
In the method for reducing the buckling of the thick plate, in P3, the roller speed ratio is adjusted to two positions after the adjustment amount is accurate to a decimal point for fine adjustment.
The invention has the beneficial effects that:
(1) according to the invention, the uniformity of metal deformation is obtained by improving the uniformity of heating temperature, and meanwhile, the lower surface temperature drop is slower than the upper surface temperature drop in the rolling process is considered, and the lower surface temperature of the target steel tapping is set to be lower than the upper surface temperature;
(2) The invention reasonably optimizes the reduction schedule, properly reduces the final reduction rate and improves the finish rolling temperature to reduce the rolling deformation resistance, and simultaneously stabilizes the rolling working condition and reduces the plate profile fluctuation;
(3) in the invention, effective control means and preventive measures are adopted in the rolling process, so that the occurrence rate of rolling warping buckle heads is reduced;
(4) according to the invention, the roll gap of the pre-straightening machine is adjusted, the cooling front plate type is improved, the uniform ACC watering and cooling are facilitated, and the plate type change is reduced;
(5) In the invention, when the tail part of the straightening steel plate is pre-straightened, the roll gap is reduced by manual intervention, so that the straightening effect is improved; optimizing a water ratio model, and improving the hit rate of the first watering plate type; head and tail flow shielding, and solves the problem of lower header flow shielding setting of concave buckling of the head;
(6) The invention optimizes the straightening process, improves the straightening temperature and the straightening force aiming at the thick plate, and can reduce the deformation resistance and improve the straightening effect.
Detailed Description
The method for reducing buckling of the thick plate provided by the embodiment comprises the following steps
P1, heating
setting the temperature of the lower surface of the target steel tapping to be 10-30 ℃ lower than the temperature of the upper surface and the temperature uniformity to be less than or equal to 10 ℃;
P2 rolling reduction
controlling the middle upper limit of the final rolling temperature, and controlling the leveling force to be 500-800 tons; on the premise of ensuring that the rolling force is not less than 24000kN, controlling the final rolling force of the finish rolling to be as small as possible, and controlling the final reduction rate of the finish rolling to be not more than 8%; the rolling speed is less than or equal to 3.0m/s, and the rolling impact is reduced; if the warping head in the rolling process is not controlled, one rolling pass is added, and the pass reduction rate is reduced;
The thickness of the intermediate blank is controlled according to the minimum of the process range; the pressing procedures of the same specification are consistent;
P3 rolling warping buckle adjustment
after the intermediate billet is penetrated by water, rolling is started after the intermediate billet is returned to red for more than 60 s; according to different conditions of multi-blank rolling, the buckle head is adjusted by adjusting the speed ratio of the upper roller to the lower roller and the height of the rolling line, the speed ratio range of the upper roller to the lower roller is 1.0-10.0, the speed ratio adjustment amount of the rollers is finely adjusted to two decimal places, and the height of the rolling line is 805-815 mm;
The pressing procedures of the same specification are consistent; ensuring that blanks with the same specification are consistent in water penetration; ensuring that the second-stage rolling temperatures with the same specification are consistent;
P4, Prerectification and ACC watering cooling
manually intervening to reduce the roll gap by 0.5-1.0 mm when the tail of the straightening steel plate is pre-straightened;
optimizing a water ratio model: w is not more than 2700, h is less than 45, and the water ratio is 1.15; h is more than or equal to 45, and the water ratio is 1.30;
W is more than 2700 and less than 3500, h is less than 45, and the water ratio is 1.25; h is more than or equal to 45, and the water ratio is 1.35;
W is more than or equal to 3500 and less than or equal to 4850, h is less than 45, and the water ratio is 1.35; h is more than or equal to 45, and the water ratio is 1.40;
head and tail flow shielding: 1-5 groups, 6-8 groups, 9-11 groups and 12-14 groups of lower collecting pipes, wherein the head shielding coefficients are all 0.8, and the head shielding positions are all 3000 mm;
P5, straightening by warm straightening
The cold bed automatically and quickly passes through a steel plate and a straightening machine for high-temperature straightening, and the straightening temperature is ensured to be more than or equal to 450 ℃; the straightening pass is more than or equal to 3 passes, and the straightening force is 15000 kN-20000 kN.
the method is mainly applied to reducing the buckling of the thick plate, and solves the process power consumption problems of buckling, watering and cooling buckling and straightening and flattening in the rolling process aiming at the production of the steel plate with the thickness of more than 50 mm.
the average buckling incidence rate of the factory in 2019 in 1-5 months per month is reduced from 20.5% to 15% in 2018, and the effect is quite obvious. The flattening process calculates the cost according to 180 yuan/ton per ton, and a wide and thick plate factory produces 2 ten thousand tons of thick plates per month, so that the buckling economic benefit of the thick plates reduced in 1-5 months in 2019 is as follows: (20.5% -15%) 15000 ton/month 180 yuan x 5 month =74.25 ten thousand yuan. The straightening effect can be improved and the generation of surface iron scale and indentation can be reduced by increasing the temperature straightening temperature, the cost of grinding indentation is 65 yuan/ton per ton, the indentation occurrence rate is 0.10%, and the cost of grinding indentation is reduced by 0.001 × 15000 ton/month × 65 yuan/ton 5 month =0.48 ten thousand yuan in 1-5 months in 2019. The predicted annual economic benefit can reach 179.37 ten thousand yuan: the flattening cost is reduced by 178.2 ten thousand yuan, and the indentation polishing cost is reduced by 1.17 ten thousand yuan.
in addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (8)
1. a method for reducing buckling of a thick plate is characterized in that: comprises that
P1, heating
Setting the temperature of the lower surface of the target steel tapping to be 10-30 ℃ lower than the temperature of the upper surface and the temperature uniformity to be less than or equal to 10 ℃;
P2 rolling reduction
Controlling the middle upper limit of the final rolling temperature, and controlling the leveling force to be 500-800 tons; on the premise of ensuring that the rolling force is not less than 24000kN, controlling the final rolling force of the finish rolling to be as small as possible, and controlling the final reduction rate of the finish rolling to be not more than 8%; the rolling speed is less than or equal to 3.0 m/s;
P3 rolling warping buckle adjustment
After the intermediate billet is penetrated by water, rolling is started after the intermediate billet is returned to red for more than 60 s; according to different conditions of multi-billet rolling, adjusting the buckle head by adjusting the speed ratio of the upper and lower rollers and the height of a rolling line;
P4, Prerectification and ACC watering cooling
Manually intervening to reduce the roll gap by 0.5-1.0 mm when the tail of the straightening steel plate is pre-straightened;
optimizing a water ratio model: w is not more than 2700, h is less than 45, and the water ratio is 1.15; h is more than or equal to 45, and the water ratio is 1.30;
W is more than 2700 and less than 3500, h is less than 45, and the water ratio is 1.25; h is more than or equal to 45, and the water ratio is 1.35;
W is more than or equal to 3500 and less than or equal to 4850, h is less than 45, and the water ratio is 1.35; h is more than or equal to 45, and the water ratio is 1.40;
Head and tail flow shielding: 1-5 groups, 6-8 groups, 9-11 groups and 12-14 groups of lower collecting pipes, wherein the head shielding coefficients are all 0.8, and the head shielding positions are all 3000 mm;
P5, straightening by warm straightening
The cold bed automatically and quickly passes through a steel plate and a straightening machine for high-temperature straightening, and the straightening temperature is ensured to be more than or equal to 450 ℃; the straightening pass is more than or equal to 3 passes, and the straightening force is 15000 kN-20000 kN.
2. The method of claim 1, wherein the method comprises: in the P2, if the warping in the rolling process is not controlled, one rolling pass is increased, and the pass reduction rate is reduced.
3. The method of claim 2, wherein the method comprises: in the P2, the thickness of the intermediate blank is controlled according to the minimum control of a process range.
4. the method of claim 3, wherein the method comprises: in the P2, the pressing procedures of the same specification are consistent.
5. The method of claim 1, wherein the method comprises: in the P3, the water penetration of the blanks with the same specification is ensured to be consistent.
6. the method of claim 5, wherein the method comprises: in the P3, the start rolling temperature of the second stage with the same specification is ensured to be consistent.
7. the method of claim 6, wherein the method comprises: in the P3, the speed ratio of the upper roller to the lower roller ranges from 1.0 to 10.0, and the height of the rolling line ranges from 805 mm to 815 mm.
8. the method of claim 7, wherein the method comprises: in the P3, the roller speed ratio adjustment amount is adjusted to two decimal points for fine adjustment.
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| CN201910778497.2A CN110548763B (en) | 2019-08-22 | 2019-08-22 | Method for reducing buckling of thick plate |
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| CN201910778497.2A CN110548763B (en) | 2019-08-22 | 2019-08-22 | Method for reducing buckling of thick plate |
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| CN110548763B CN110548763B (en) | 2020-12-18 |
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Cited By (2)
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| CN113083916A (en) * | 2021-04-30 | 2021-07-09 | 南京钢铁股份有限公司 | Method for improving buckling of head of thick plate after shearing by heavy and medium plate mill |
| CN115401068A (en) * | 2021-05-27 | 2022-11-29 | 宝山钢铁股份有限公司 | Method for rolling wide and thin stainless steel by using 5m thick plate mill |
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| CN115401068A (en) * | 2021-05-27 | 2022-11-29 | 宝山钢铁股份有限公司 | Method for rolling wide and thin stainless steel by using 5m thick plate mill |
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